Title of Invention: Methods Abstract: This invention relates to disgnostic methods for the detection of one or more cytochrome b mutations in fungi at the position corresponding to Saccharomyces cerevisiae cytochrome b residue 129 that leads to resistance to strobilurin analogues or compounds in the same cross resistance group using any (or a) single nucleotide polymorphism detection technique, preferably using either an allele specific amplilication technique such as the amplification refractory mutation system (ARMS) or preferably using an allele selective hybridisation probe technique such as Molecular Beacons or TaqMan. The invention also relates to mutation specific oligonucleotides for use in the method and to diagnostic kits containing these (oligonucleotides. Detailed Description: FIELD OF THE INVENTION This invention relates to diagnostic methods for the detection of one or more cytochrome b mutations in fungi at the position corresponding to Saccharomyces cerevisiae cytochrome b residue 129 that leads to resistance to strobilurin analogues or compounds in the same cross resistance group using any (or a) single nucleotide polymorphism detection technique, preferably using either an allele specific amplification technique such as the amplification refractory mutation system (ARMS) or preferably using an allele selective hybridisation probe technique such as Molecular Beacons or TaqMan. The invention also relates to mutation specific oligonucleotides for use in the methods of the inventionand to diagnostic kits containing these oligonucleotides. BACKGROUND OF THE INVENTION The widespread use of fungicides in agriculture is a relatively recent phenomenon, and most of the major developments have taken place during the last 40 years. Previously, farmers often ignored or did not recognise the effect that fungal pathogens had on the yield and quality of their crops. Nowadays, however these losses are unacceptable, and farmers rely on the use of fungicidal chemicals to control fungal diseases. As a consequence, commercial fungicides have become an important component of the total agrochemical business, with world-wide sales in 1996 of about $5.9 billion, equivalent to 18.9% of the total agrochemical market (Wood Mackenzie, 1997a ‘Agchem products—The key agrochemical product groups’, in Agrochemical Service, Update of the Products Section, May 1997, 1-74). A large number of fungicides are already available to the farmer; a recent edition of The Pesticide Manual (Tomlin, 1994 10th Edition, British Crop Protection Council, Farnham, UK, and the Royal Society of Chemistry, Cambridge, UK) contains 158 different fungicidal active ingredients in current use. Nevertheless, further industrial research aimed at the discovery and development of new compounds is extremely intensive and product management procedures are extremely important in securing the best and longest lasting performance from fungicides with a particular mode of action and/or belonging to a particular compound series. In particular it is vital to develop effective resistance management strategies when fungicides with new modes of action are introduced (Fungicide Resistance Management: Into The Next Millenium (Russell) 1999, in Pesticide Outlook, October 1999 (213-215). The strobilurin analogues constitute a major new series of agricultural fungicides, which are considered the most exciting development on the agricultural fungicide scene since the discovery of the 1,2,4-triazoles in the 1970s. The fungicidal activity of the strobilurin analogues is a result of their ability to inhibit mitochondrial respiration in fungi. More specifically, it has been established that these compounds have a novel single site mode of action, exerting their effect on fungi by blocking the ubiquinol:cytochrome c oxidoreductase complex (cytochrome bc1) thus reducing the generation of energy rich ATP in the fungal cell (Becker et al 1981 FEBS Letts. 132: 329-33). This family of inhibitors prevents electron transfer at the ubiquinone redox site Qo on the multimeric cytochrome b protein (Esposti et al 1993 Biochim. et Biophys Acta 1143(3): 243-271). Unlike many mitochondrial proteins, the cytochrome b protein is mitochondrially encoded. Reports in the literature show that specific amino acid changes at the cytochrome b target site can affect the activity of strobilurin analogues. In depth mutagenesis studies in Saccharomyces cerevisiae (hereinafter referred to as S. cerevisiae) (JP Rago et al 1989 J. Biol. Chem. 264:14543-14548), mouse (Howell et al 1988 J. Mol. Biol. 203:607-618), Chlamydomonas reinhardtii (Bennoun et al 1991 Genetics 127:335-343) and Rhodobacter spp (Daldal et al 1989 EMBO J. 8(13):3951-3961) have been carried out. Relevant information was also gathered from studying the natural basis for resistance to strobilurin analogues in the sea urchin Paracentrotus lividus (Esposti et al 1990 FEBS 263:245-247) and the Basidiomycete fungi Mycena galopoda and Strobilurus tenacellus (Kraiczy et al 1996 Eur. J. Biochem. 235:54-63), both of which produce natural variants of the strobilurin analogues. There are two distinct regions of the cytochrome b gene where amino acid changes have a dramatic effect on strobilurin analogue activity. These areas cover amino acid residues 125-148 and 250-295 (based on S. cerevisiae residue numbering system). More precisely amino acid changes at residues 126, 129, 132, 133, 137, 142, 143, 147, 148, 256, 275 and 295 have been shown to give rise to resistance to strobilurin analogues (Brasseur et al 1996 Biochim. Biophys. Acta 1275:61-69 and Esposti et al (1993) Biochimica et Biophysica Acta, 1143:243-271). Published International Patent Application Number WO 00/66773 describes the identification of a mutation in a fungal cytochrome b gene resulting in a glycine to alanine replacement at the position corresponding to S. cerevisiae cytochrome b residue 143 (G143A) in the encoded protein. The present invention identifies for the first time the key importance of a further mutation(s) in cytochrome b gene of field isolates of important plant pathogenic fungi showing resistance to a strobilurin analogue or a compound in the same cross resistance group. SUMMARY OF THE INVENTION According to a first aspect of the invention we now provide a method for the detection of the presence or absence of one or more mutations in a fungal cytochrome b gene resulting in an amino acid replacement at the position corresponding to S. cerevisiae cytochrome b residue 129 in the encoded protein wherein the presence of said mutation(s) gives rise to fungal resistance to a strobilurin analogue or any other compound in the same cross resistance group said method comprising identifying the presence or absence of said mutation(s) in fungal nucleic acid using any (or a) single nucleotide polymorphism detection technique. According to a preferred embodiment of the first aspect of the invention we now provide a method for the detection of the presence or absence of one or more mutations in a fungal cytochrome b gene resulting in a phenyalanine to leucine replacement at the position corresponding to S. cerevisiae cytochrome b residue 129 in the encoded protein wherein the presence of said mutation(s) gives rise to fungal resistance to a strobilurin analogue or any other compound in the same cross resistance group said method comprising identifying the presence or absence of said mutation(s) in fungal nucleic acid using any (or a) single nucleotide polymorphism detection technique. In the present invention we have now devised diagnostic methods for the detection of one or more point mutations in a fungal cytochrome b gene based on single nucleotide polymorphism detection methods including allele specific amplification. It will be apparent to the person skilled in the art that there are a large number of analytical procedures which may be used to detect the presence or absence of variant nucleotides at one or more polymorphic positions according to the invention. In general, the detection of allelic variation requires a mutation discrimination technique, optionally an amplification reaction and optionally a signal generation system. Many current methods for the detection of allelic variation are reviewed by Nollau et al, Clin. Chem. 43:1114-1120, 1997 and in standard textbooks, for example ‘Laboratory Protocols for Mutation Detection’, Ed, by U. Landegren, Oxford University Press, 1996 and ‘PCR’ 2nd Edition by Newton and Graham, BIOS Scientific Publishers limited, 1997. Allele specific amplification reactions include primer based methods such as PCR based methods and more specifically, allele specific polymerase chain reaction (PCR) extension (ASPCR). One such ASPCR based method is ARMS (Amplification Refractory Mutagenesis System). The technique of ASPCR is described in U.S. Pat. No. 5,639,611 and the ARMS technique is described fully in European Patent No. EP 332435. All such PCR based methods are suitable for use in methods of the current invention, and the use of ARMS based methods are particularly preferred. The methods of the invention also include the use of indiscriminate PCR followed by specific probing of the amplicon generated. All of these methods are suitable for the detection of the specific alleles which can confer resistance to any of the strobilurin analogues or any other compound in the same cross resistance group and Robust tests have been developed for the detection of point mutations conferring such resistance iii a range of fungal plant pathogens Compounds may be considered to be in the same cross resistance group when the resistance mechanism to one compound also confers resistance to another, even-when the modes of action are not the same. Other single nucleotide polymorphism (SNP) detection techniques which may be used in any aspect of the invention described herein to detect one or more mutation include, for example, restriction fragment length polymorphism (RFLP), single strand conformation polymorphism, multiple clonal analysis, allele-specific oligonucleotide hybridisation, single nucleotide primer extension (Juvonen et al, (1994) Hum Genet 93 16-20; Huoponen et al, (1994) Hum Mutat 3 29-36; Mashima et al (1995), Invest Opthelmol. Vision. Sci 36,1714-20; Howell et al (1994) Am J Hum Genet. 55 203-206; Koyabashi et al; (1994) Am. J. Hum. Genet. 55 206-209; Johns and Neufeld (1993) Am J Hum Genet 53 916-920; Chomyn et al, (1992) Proc. Natl. Acad. Sci USA 89 4221-4225) and Invader™ technology (available from Third Wave Technologies Inc. 502 South Rosa Road, Madison, Wis. 53719 USA). The use of PCR based detection systems is preferred for use in all aspects and embodiments of the invention described herein. The use of allele selective hybridisation probe techniques, often in combination with PCR based target DNA fragment amplification, is also preferred for all aspects and embodiments of the invention described herein. In a preferred embodiment of the first aspect of the invention we now provide a diagnostic method for the detection of the presence of absence of one or more mutation(s) in a fungal cytochrome b gene resulting in a F129L replacement in the encoded protein wherein the presence of said mutation(s) gives rise to fungal resistance to a strobilurin analogue or any other compound in the same cross resistance group said method comprising detecting the presence of an amplicon generated during a PCR reaction wherein said PCR reaction comprises contacting a test sample comprising fungal nucleic acid with a diagnostic primer in the presence of appropriate nucleotide triphosphates and an agent for polymerisation wherein the detection of said amplicon is directly related to presence or absence of said mutation(s) in said nucleic acid. The detection of the amplicon generated during the PCR reaction may be directly dependent on the extension of a primer specific for the presence of the mutation i.e. where primer extension is dependent on the presence of the mutation and hence an amplicon is generated only when the primer binds and/or is extended when the mutation is present (as is the case with ARMS technology), similarly it may be directly dependent on the extension of a primer specific for the absence of the mutation e.g. wild type sequence or may be directly linked to the PCR extension product containing the mutant DNA sequence i.e. where the detection is of an amplicon comprising the mutant DNA sequence. The first alternative is particularly preferred. In the above method of the invention where allele selective amplification is used the said diagnostic method comprises detecting the presence of an amplicon generated during a PCR reaction wherein said PCR reaction comprises contacting a test sample comprising fungal nucleic acid with a diagnostic primer in the presence of appropriate nucleotide triphosphates and an agent for polymerisation wherein the generation of said amplicon is directly related to presence or absence of said mutation(s) in said nucleic acid. The amplicon can be from any PCR cycle and this includes a first allele specific primer extension product. In an alternative preferred example the method of the invention uses an allele selective hybridisation probe technique such as Molecular Beacons or TaqMan (as described herein, see Example 18). In a particularly preferred embodiment of the first aspect of the invention we now provide a diagnostic method for the detection of the presence or absence of one or more mutation(s) in a fungal cytochrome b gene resulting in a F129L replacement in the encoded protein wherein the presence of said mutation(s) gives rise to fungal resistance to a strobilurin analogue or any other compound in the same cross resistance group said method comprising contacting a test sample, comprising a fungal nucleic acid, with a diagnostic primer appropriate for the mutation(s) resulting in a F129L replacement in the encoded protein, in the presence of appropriate nucleotide triphosphates and an agent for polymerisation, such that the diagnostic primer is extended when the mutation(s) is (are) present in the sample that results in an F129L replacement in the encoded protein or when wild type sequence is present; and detecting the presence orabsence of the said mutation(s) by reference to the presence or absence of the diagnostic primer extension product. In a further preferred embodiment the invention provides a method for detecting the presence or absence one or more mutation(s) in a fungal cytochrome b gene resulting in a F129L replacement in the encoded protein wherein the presence of said mutation(s) gives rise to fungal resistance to a strobilurin analogue or any other compound in the same cross resistance group which method comprises contacting a test sample comprising a fungal nucleic acid with a diagnostic primer for the specific mutation(s) in the presence of appropriate nucleotide triphosphates and an agent for polymerisation, such that the diagnostic primer is extended when the said mutation(s) is (are) present in the sample; and detecting the presence or absence of the mutation(s) by reference to the presence or absence of a diagnostic primer extension product. According to a particularly preferred embodiment of the first aspect of the invention we provide a method for detecting the presence or absence of one or more mutation(s) in a fungal cytochrome b gene resulting in a F129L replacement in the encoded protein wherein the presence of said mutation(s) gives rise to fungal resistance to a strobilurin analogue or any other compound in the same cross resistance group which method comprises contacting a test sample comprising a fungal nucleic acid with a diagnostic primer for the specific mutation(s) in the presence of appropriate nucleotide triphosphates and an agent for polymerisation, such that the diagnostic primer is extended only when the mutation(s) is (are) present in the sample; and detecting the presence or absence of the mutation(s) by reference to the presence or absence of a diagnostic primer extension product. As used herein the term diagnostic primer is used to indicate a primer which is used specifically to identify the presence or absence of a mutation or wild type sequence and the term common primer is used to denote a primer binding to the opposite strand of DNA to that to which the diagnostic primer and 3′ to the region recognised by that diagnostic primer and which, by acting in concert with said diagnostic primer allows amplification of the intervening tract of DNA during the PCR. Where the diagnostic primer is an ARMS primer it can have a 3′ mismatch when compared to the mutant or wild type sequence. In this and in further aspects and embodiments of the invention it is preferred that the extension of the primer extension product is detected using a detection system which is an integral part of either the diagnostic primer or the common primer on the opposite strand. Alternatively where a Taqman® or Taqman®MGB probe is used in conjunction with a diagnostic primer and a common primer, the Taqman® or Taqman®MGB probe will comprise the detection means. This is described more fully herein. Compounds may be considered to be in the same cross resistance group when the resistance mechanism to one compound also confers resistance to another, even when the modes of action are not the same. The strobilurin analogues and compounds in the same cross resistance group include for example, azoxystrobin, picoxystrobin, kresoxim-methyl, trifloxystrobin, pyraclostrobin, famoxadone and fenamidone. (Details of pyraclostrobin were presented at the BCPC Conference in Brighton in November 2000—see Abstract 5A-2). It should also be noted that strobilurin analogues or compounds in the same cross resistance group are now frequently referred to as Qo site inhibitors (QoIs) because of their action on the complex III Qo site. We have found that the position in fungal nucleic acids encoding cytochrome b that corresponds to the 129th codon/amino acid in the cytochrome b of S. cerevisiae sequence is a key determinant of fungal resistance to strobilurin analogues or any other compound in the same cross resistance group in field isolates of strobilurin analogue resistant plant pathogenic fungi. The methods of the invention described herein are particularly suitable for the detection of a mutation at the position corresponding to that endcoding Saccharomyces cerevisiae cytochrome b residue 129 where the encoded phenylalanine residue is replaced by another amino acid which prevents the activity of strobilurin analogues or any other compound in the same cross resistance group and results in a resistant phenotype in the fungus carrying the mutant cytochrome b gene thereby giving rise to fungal resistance to strobilurin analogues or any other compound in the same cross resistance group. The method is preferably used for the detection of a mutation resulting in the replacement of said phenylalanine residue at the position corresponding to S. cerevisiae cytochrome b residue 129 with an amino acid selected from the group isoleucine, leucine, serine, cysteine, valine, tyrosine. It is most preferable that the mutation(s) to be detected results in the phenylalanine residue being replaced by leucine. The mutation in the fungal cytochrome b gene resulting in a F129L replacement in the encoded protein is usually a thymine to cytosine base change at the first position (base) of the codon or a thymine or cytosine to adenine or guanine base change at the third position (base) of the codon and the detection of these single nucleotide polymorphisms is preferred for all aspects and embodiments of the invention described herein. It is further possible that a rare combination of a change from thymine to cytosine at the first position and a thymine or cytosine to adenine or guanine base change at the third position (base) of the codon may also occur and this is covered in all aspects and embodiments of the invention. It should be noted that in this patent application frequent reference is made to both mutations and allelic variants (alleles) of the cytochrome b gene which confer resistance to strobilurin analogues or compounds in the same cross resistance group. Such references are essentially synonymous although the term mutation tends to imply a new or recent genetic change whereas allelic variant implies that an alternate, and in this case resistance conferring, form of the gene may have been present for some time in the population under analysis. These alternatives are indistinguishable during analysis of natural populations. It should also be noted that the nature in the difference in properties of the wild type and mutant/allelic variant form of the cytochrome b protein, encoded by the gene conferring resistance to strobilurin analogues or compounds in the same cross resistance group, requires an amino acid substitution within the so-called Qo site of the respective respiration complex m species which are, in part, comprised of the cytochrome b protein. Such amino acid substitutions are caused by changes in the codon for the altered amino acid. Typically, and in the specific examples considered herein, the amino acid substitution of interest is caused by a change in only one of the three nucleotide residues in that codon. Such changes may therefore be described as single nucleotide polymorphisms (SNPs). Occasionally because of the degeneracy of the genetic code amino acid substitutions that can be caused by a single nucleotide polymorphism may also be caused by two, closely linked (within 3 nucleotides) substitutions. Such situations are referred to herein as.“simple nucleotide polymorphisms”. By their nature it would be anticipated that such polymorphisms would be much rarer than SNPs since the sequence change required to bring it about requires at least two separate base changes, within the same codon, rather than just one. As used herein the term F129L is used to denote the substitution of a phenylalanine residue by a leucine residue in a fungal cytochrome b sequence at the equivalent of the position of the 129th codon/amino acid of the S. cerevisiae cytochrome b sequence. This nomenclature is used for all other residue changes quoted herein i.e. all positions are quoted relative to the S. cerevisiae cytochrome b protein sequence. The S. cerevisiae cytochrome b gene and protein sequences are available on the EMBL and SWISSPROT databases (See EMBL ACCESSION NO. X84042 and SWISSPROT ACCESSION NO. P00163). The skilled man will appreciate that the precise length and register of equivalent proteins from different species may vary as a result of amino or carboxy terminal and/or one or more internal deletions or insertions. However, since the amino acid tract containing the residue corresponding to F129 in S. cerevisiae is well conserved (Widger et al. Proc.Nat.Acad.Sci., U.S.A. 81 (1984) 674-678) it is straightforward and easily within the capability of the skilled man to identify the precisely corresponding residue in a newly obtained fungal cytochrome b sequence either by visual inspection or use of one of several sequence alignment programmes including Megalign or Macaw. Though designated F129 in this application (because of positional and functional equivalence) the precise position of this phenylalanine in the new cytochrome b may not be the 129w residue from its amino terminal end. The S. cerevisiae cytochrome b consensus sequence is provided in SWISSPROT ACCESSION NO. P00163. In all aspects and embodiments of the invention described herein the positions in the cytochrome b sequence are preferably as defined relative to the S. cerevisiae cytochrome b sequence provided in EMBL ACCESSION NO. X84042. Alternatively, in all aspects and embodiments of the invention described herein the positions in the cytochrome b sequence are preferably as defined relative to the S. cerevisiae cytochrome b consensus sequence as provided in SWISSPROT ACCESSION NO. P00163. According to one aspect of the invention there is provided a method for the diagnosis of one or more nucleotide polymorphisms in a fungal cytochrome b gene which method comprises determining the sequence of the fungal nucleic acid at a position corresponding to one or more of the bases in the triplet coding for the amino acid at the position that corresponds to S. cerevisiae cytochrome b residue 129 in the cytochrome b protein and determining the resistance status of the fungus to a strobilurin analogue or a compound in the same cross resistance group by reference to one or more polymorphisms in the cytochrome b gene. In all aspects and embodiments of the invention described herein it is preferred that only one base in the triplet coding for the amino acid at the position corresponding to S. cerevisiae cytochrome b residue 129 in the cytochrome b protein shows a mutation i.e. there is a single nucleotide polymorphism occurring at one position only and it is further preferred that it is at the first or third base of the triplet. According to a preferred embodiment of this aspect of the invention there is provided a method for the diagnosis of a single nucleotide polymorphism in a fungal cytochrome b gene which method comprises determining the sequence of fungal nucleic acid at a position corresponding to the first or third base in the triplet coding for the amino acid at the position corresponding to S. cerevisiae cytochrome b residue 129 in the cytochrome b protein and determining the resistance status of the said fungi to a strobilurin analogue or a compound in the same cross resistance group by reference to a polymorphism in the cytochrome b gene. In an embodiment of the above aspect of the invention the method for diagnosis described herein is one in which the single nucleotide polymorphism at positions in the DNA corresponding to the first or third base in the triplet coding for the amino acid at the position corresponding to S. cerevisiae cytochrome b residue 129 in the cytochrome b protein is presence of T or C at the first base in the codon and T, C, A or G at the third base in the codon. TABLE 1 Codon sequences encoding phenylalanine and leucine. First Second Third position position position T T Phe T Phe C Leu A Leu G C Leu T Leu C Leu A Leu G In wild type cytochrome b, if the phenylalanine residue at position 129 is encoded by either a TTT or TTC codon, then a single base mutation at the first position of the codon to a C (cytosine) would result in substitution of the phenylalanine residue in the Qo site of the strobilurin resistant mutant. Likewise if in wild type cytochrome b the phenylalanine at position 129 is encoded by either a TTT or TTC codon, then a single base position at the third position of the codon to an A (adenine) or a G (guanine) would result in substitution of the phenylalanine residue in the Qo site of the strobilurin resistant mutant. A double substitution at the first position (from a T to a C) together with a substitution at the third position (from either a T or a C to either an A or a G) could also cause such a phenylalanine to leucine amino acid substitution (see Table 1). In order to define whether a given plant pathogen or population of a plant pathogen is resistant to Qo site inhibitor fungicides or contains significant levels of a resistant allele as a result of the presence of a leucine residue at position 129, it is simply necessary to establish and/or measure whether that pathogen or population has a C residue at the first position of its cognate codon and/or an A or G residue at the third position. One method of achieving such an assessment is to use technology based on diagnostic primers such as ARMS primers. (The concept of ARMS primers is described fully in Newton et al, Nucleic Acid Research 17 (7) 2503-2516 1989). As a consequence of the above features of phenylalanine and leucine codons (see Table 1), when ARMS technology is used to detect and/or measure the status of residue 129, it is possible to design appropriate PCR primers that are capable of defining the identity and/or amounts of particular residues at either the first or third positions of the cognate codon in the pathogen cytochrome b gene. Such design requires the knowledge of only wild type sequence. There is no need to have access to a resistant isolate in a new fungus of interest where resistance results from a F129L mutation. Some examples of relevant plant pathogenic fungi are listed in Table 2. This list is not meant to be in any way to be exclusive. The skilled plant pathologist will be able to readily identify those fungi to which the methods of this invention are relevant. TABLE 2 Example of species where F129L can be assayed. Examples of species in which F129L can be assayed: 1 Plasmopara viticola 2 Erysiphe graminis f. sp. trilici/hordei 3 Rhynchosporium secalis 4 Pyrenophora teres 5 Mycosphaerella graminicola 6 Mycosphaerella fijiensis var. difformis 7 Sphaerotheca fuliginea 8 Uncinula necator 9 Colletotrichum graminicola 10 Pythium aphanidermatum 11 Colletotrichum gloeosporioides 12 Oidium lycopersicum 13 Leveillula taurica 14 Pseudoperonospora cubensis 15 Alternaria solani 16 Cercospora arachidola 17 Rhizoctonia solani 18 Venturia inaequalis 19 Phytophthora infestans 20 Mycosphaerella musicola 21 Colletotrichum acutatum 22 Wilsonomyces carpophillum 23 Didymella bryoniae 24 Didymella lycopersici 25 Peronospora tabacina 26 Puccinia recondita 27 Puccinia horiana The methods of the invention described herein are particularly useful in connection with plant pathogenic fungi and especially with any of the following fungal species: Plasmopara viticola, Erysiphe graminis f.sp. tritic/hordei, Rhynchosporium secalis, Pyrenophora teres, Mycosphaerella graminicola, Venturia inaequalis, Mycosphaerella fijiensis var. difformis, Sphaerotheca fuliginea, Uncinula necator, Colletotrichum graminicola, Pythium aphanidermatum, Collectotrichum gloeosporioides, Oidium lycopersicurm, Phytophthora infestans, Leveillula taurica, Pseudoperonospora cubensis, Alternaria solani, Rhizoctonia solani, Mycosphaerella musicola, Cercospora arachidola, Colletotrichum acutatum, Wilsonomyces carpophillum, Didymella bryoniae, Didymella lycopersici, Peronospora tabacina, Puccinia recondita and Puccinia horiana, and most especially with any of the following fungal species: Plasmopara viticola, Erysiphe graminis f.sp. tritici/hordei, Rhynchosporium secalis, Pyrenophora teres, Mycosphaerella graminicola, Venturia inaequalis, Mycosphaerella fijiensis var. difformis, Sphaerotheca fuliginea, Uncinula necator, Colletotrichum graminicola, Pythium aphanidermatum, Colletotrichum gloeosporioides, Oidium lycopersicum, Phytophthora infestans, Leveillula taurica, Pseudoperonospora cubensis, Alternaria solani, Rhizoctonia solani, Didymella bryoniae, Didymella lycopersici, Mycosphaerella musicola and Cercospora arachidola. In a further aspect the invention provides a method for detecting fungal resistance to a strobilurin analogue or any other compound in the same cross resistance group said method comprising identifying the presence or absence of one or more mutation(s) in a fungal nucleic acid that encodes a fungal cytochrome b protein wherein the presence of said mutation(s) gives rise to resistance to a strobilurin analogue or any other compound in the same cross resistance group said method comprising identifying the presence or absence of a single nucleotide polymorphism occurring at positions corresponding to one or more of the bases in the triplet coding for the amino acid at the position corresponding to S. cerevisiae cytochrome b residue 129 in the fungal cytochrome b protein. In a further preferred embodiment of this aspect the invention provides a method for detecting fungal resistance to a strobilurin analogue or any other compound in the same cross resistance group said method comprising identifying the presence or absence of a mutation in a fungal nucleic acid that encodes a fungal cytochrome b protein wherein the presence of said mutation gives rise to resistance to a strobilurin analogue or any other compound in the same cross resistance group said method comprising identifying the presence or absence of a single nucleotide polymorphism occurring at a position corresponding to the first and/or third base in the triplet coding for the amino acid at the position corresponding to S. cerevisiae cytochrome b residue 129 in the fungal cytochrome b protein. In a preferred embodiment of this aspect of the invention the presence or absence of a single nucleotide polymorphism at a position corresponding to the first and/or third base in the triplet coding for the amino acid at the position corresponding to S. cerevisiae cytochrome b residue 129 in the cytochrome b gene in fungal nucleic acid are identified using any (or a) single nucleotide polymorphism detection technique. The invention further provides a fungal DNA sequence encoding all or part of a wild type cytochrome b protein wherein said DNA sequence encodes a phenylalanine residue at the position corresponding to S. cerevisiae cytochrome b residue 129 in the wild type protein wherein said sequence is obtainable or obtained from a fungus selected from the group consisting of: Plasmopara viticola, Rhynchosporium secalis, Pyrenophora teres, Mycosphaerella graminicola, Mycosphaerella fijiensis var. difformis, Sphaerotheca fuliginea, Uncinula necator, Colletotrichum graminicola, Pythium aphanidermatum, Colletotrichum gloeosporioides, Oidium lycopersicum, Leveillula taurica, Pseudoperonospora cubensis, Alternaria solani, Rhizoctania solani, Mycosphaerella musicola, Cercospora arachidola, Colletotrichum acutatum, Wilsonomyces carpophillum, Didymella bryoniae, Didymella lycopersici, Peronospora tabacina, Puccinia recondita and Puccinia horiana, preferably from the group consisting of: Plasmopara viticola, Rhynchosporium secalis, Pyrenophora teres, Mycosphaerella graminicola, Mycosphaerella fijiensis var. difformis, Sphaerotheca fuliginea, Uncinula necator, Colletotrichum graminicola, Pythium aphanidermatum, Colletotrichum gloeosporioides, Oidium lycopersicum, Leveillula taurica, Pseudoperonospora cubensis, Alternaria solani, Rhizoctania solani, Didymella bryoniae, Didymella lycopersici, Mycosphaerella musicola and Cercospora arachidola. A fungal DNA sequence according to the above aspects of the invention preferably comprises around 30 nucleotides on either or both sides of the position in the DNA that corresponds to one or more of the bases in the triplet (preferably the third base) coding for the amino acid at the position corresponding to S. cerevisiae cytochrome b residue 129 in the protein since this extent of nucleic acid provides the skilled man with all information necessary to design species- and mutation-specific reagents and/or methods for use in/with all single nucleotide polymorphism detection techniques as described herein. As used herein the term around 30 means that the sequence may comprise up to 30 nucleotides, for example 5, up to 10, 15, 20, or 25 nucleotides or may comprise more than 30 nucleotides, for example around 50 nucleotides i.e. up to 35, 40, 45 or 50 or more nucleotides. As used herein in connection with all DNA and protein sequences the term ‘all or part of’ is used to denote a DNA sequence or protein sequence or a fragment thereof. A fragment of DNA or protein may for example be 10%, 20%, 25%, 30%, 40%, 50%, 60%, 70%, 75%, 80%, 85%, 90%, or 95% of the length of the whole sequence. The invention extends also to novel protein sequences encoded by the DNA sequences of the present invention. It will be evident to the man skilled in the art that both samples containing genomic (mitochondrial) DNA and cDNA may be analysed according to the invention. Where the sample contains genomic DNA, intron organisation needs to be taken into account when using the sequence information. Examnples of wild type fungal DNA sequences comprising part of the wild type cytochrome b gene sequence according to the above aspect of the invention are provided in Table 3 below and said sequences form a further aspect of the invention. TABLE 3 Tracts of wild type cytochrome b genomic and/or cDNA sequence flanking the codon corresponding to codon 129 in the S. cerevisiae cytochrome b sequence (first and last residues shown in bold and underlined) for a series of important plant pathogens. Species Sequence Plasmopara viticola 5′TTATGGTGTTCAGGGGTAAT (cDNA & genomic) TATTTTTATTTTAATGATGGCG ACTGCATTTATGGGTTATG 3′ Rhynchosporium secalis 5′GTATGAACAATAGGTACATT (cDNA & genomic, TATATTCATATTAATGATCGTT ACAGCATTCTTGGGTTATG 3′ Pyrenophora teres 5′GTATGAACTATTGGTACTGT (cDNA) TATCTTTATCTTAATGATGGCT ACAGCCTTCCTGGGTTACG 3′ Pyrenophora teres 5′CGCTATACAGATAAATTTAG (genomic) GTTGTAGTTAGCCGGAACTTAG ACAGCCTTCCTGGGTTACCAAC ATAGCCCAAAATGGTTTAATAT AAGTAATAAAAAAAG 3′ Mycosphaerella graminicola 5′ACATGAACAATCGGTACTAT (cDNA & genomic) AATACTAGTTCTGATGATGGCA ACCGCATTCTTAGGGTATG 3′ Sphaerotheca fuliginea 5′CATTAGGTGTAGTTATATTC (cDNA) ATATTAATGATCGTTACTGCAT TCCTGGGTTATG 3′ Uncinula necator 5′CAATTGGTACAGTAATATTC (cDNA) ATTTTAATGATGGCTACAGCAT TCTTGGGTTATG 3′ Colletotrichum graminicola— 5′GTTTGAGTTATAGGTGCTAT Cgr1 (genomic & cDNA) AATACTTGTAGCTATGATGGGT ATAGGTTTCTTAGGGTATGTTT TACCTTACGGACAAATGTCATT ATGAGGTGCTACAGT 3′ Colletotrichum graminicola— 5′GTTTGAGTTATAGGTTGTAT Cgr2 (genomic & cDNA) AATACTTGTAGCTATGATGGGT ATAGGTTTCTTAGGATATGTTT TACCTTACGGACAAATGTCATT ATGAGGTGCTACAGT 3′ Colletotrichum graminicola— 5′GTTTGAGTTATAGGTACTAT Cgr3 (cDNA) AATACTTGTAGCTATGATGGGT ATAGGTTTCCTGGGTTATGTTT TACCTTACGGACAAATGTCACT ATGAGGTGCAACTGT 3′ Colletotrichum graminicola— 5′GTTTGAGTTATAGGTACTAT Cgr3 (genomic) AATACTTGTAGCTATGATGGGT ATAGGTTTCCTGGGTTACTTCA ACATAGCCCAAAATGATATGCA ATTATTAGGATTTCA 3′ Pythium aphanidermatum 5′TTATGGTGTTCAGGTGTTGT (genomic & cDNA) TATTTTTATTTTAATGATGGCA ACAGCTTTCATGGGTTATG 3′ Colletotrichum 5′GTTTGAGTTATAGGTGCTAT gloeosporioides—chilli AATACTTGTAGCTATGATGGGT (genomic & cDNA) ATAGGTTTCCTGGGTTATG 3′ Colletotrichum 5′GTTTGAGTAATAGGTGCTAT gloeosporioides—mango AATTCTTGTAGCTATGATGGGT (genomic & cDNA) ATAGGTTTCTTGGGTTATGTTT TACCTTACGGGCAAATGTCATT ATGAGGTGCAACAGT 3′ Oidium lycopersicum 5′ACATGAACTATAGGTACAGT (cDNA) TATATTCATATTAATGATGGCT ACAGCATTCCTGGGTTATG 3′ Leveillula taurica—Lt1 5′ACATGAACAATAGGTGTGGT (cDNA) AATATTTATATTAATGATGGCT ACAGCTTTCTTGGGTTATGTTT TACCGTACGGTCAAATGAGTTT ATGAGGTGCAACAGT 3′ Leveillula taurica—Lt4 5′ACATGAACAATAGGTGTTGT (cDNA) AATATTTATATTAATGATGCTA CAGCTTTCCTAGGTTACGTTTT ACCATACGGGACAAATGTCATT ATGAGGTGCAACAGT 3′ Leveillula taurica—Lt2 5′ACATGAACTATTGGTGTTGT (cDNA) TATCTTTATATTAATGATGGCT ACTGCCTTTTTAGGATATGTTT TACCATATGGTCAAATGAGTTT ATGAGGTGCTACAGT 3′ Leveillula taurica—Lt3 5′ATGAACAATTGGTACAGTAA (cDNA) TATTCATATTAATGATGGCTAC TGCATTCCTGGGTTATGTTCTA CCTTTCGGACAGATGTCGCTCT GGGGTGCAACCGT 3′ Pseudoperonospora cubensis 5′TTATGGTGTTCAGGTGTTAT (cDNA & genomic) TATTTTTATTTTAATGATGGCA ACAGCTTTTATGGGTTATG 3′ Alternaria solani 5′GTATGAACTATTGGTACTGT (cDNA & genomic) TATCTTTATCTTAATGATGGCT ACAGCTTTCCTGGGTTATG 3′ Cercospora arachidola 5′TTATGATCTATTGGAGTTAT (cDNA & genomic) AATTTTAGTTCTTATGATGGCA ATAGCCTTCTTAGGATATG 3′ Rhizoctonia solani 5′CTATCGGAGTTGTTATGCTT (cDNA) CTTGTTATGATGATGGGGATCG CATTTTTAGGTTATG 3′ Mycosphaerella musicola 5′GTATGAGTTATAGGTACTAT (genomic & cDNA) TATATTAGTTCTAATGATGGCT ACCGCCTTTTTAGGATATG 3′ Didymella bryoniae—Db1 5′GTATGAACAATTGGTACTGT (cDNA) TATCTTTATCTTAATGATGGCT ACAGCTTTCCTGGGTTATGTTC TTCCTTATGGGCAAATGTCATT ATGAGGTGCAACTGT 3′ Didymella bryoniae—Db2 5′GTGTGAACAATTGGTACTGT (cDNA) TATCTTTATCTTAATGATGGCT ACAGCTTTCCTGGGTTATGTGC TGCCCTACGGGCAGATGTCATT ATGAGGTGCTACAGT 3′ Didymella lycopersici 5′GTATGAACAATTGGTACTGT (cDNA) TATCTTTATCTTAATGATGGCT ACAGCTTTCCTGGGTTATGTTC TTCCTTATGCGCAAATGTCATT ATGAGGTGCTACAGT 3′ In the above table the first and third bases in the triplet coding for the amino acid at the position corresponding to S. cerevisiae cytochrome b residue 129 which, when appropriately substituted, result in the replacement of the normal phenylalanine residue with an alternative amino acid wherein said replacement confers resistance to strobilurin analogues or a compound within the same cross resistance group are in bold and underlined. The invention also extends to a fungal DNA sequence showing homology or sequence identity to said DNA sequences in Table 3 and covers for example, variations in DNA sequences found in different samples or isolates of the same species. These variations may, for example, be due to the use of alternative codon usage, varying intron/exon mitochondrial organisation and amino acid replacement. In a further aspect the invention provides a fungal DNA sequence, which encodes all or part of a fungal cytochrome b protein wherein, when said fungal DNA sequence is lined up against the corresponding wild type DNA sequence that encodes a cytochrome b protein, it is seen that the fungal DNA sequence contains a single nucleotide polymorphism mutation at a position in the DNA that corresponds to one or more of the bases in the triplet coding for the amino acid at the position corresponding to S. cerevisiae cytochrome b residue 129 in the protein which results in the replacement of the normal phenylalanine residue with an alternative amino acid. In a further preferred embodiment of this aspect the invention provides a fungal DNA sequence encoding all or part of a cytochrome b protein which, when said sequence is lined up against the corresponding wild type DNA sequence encoding a cytochrome b protein, is seen to contain a single nucleotide polymorphism mutation at a position in the DNA corresponding to the first or third base in the triplet coding for the amino acid at the position corresponding to S. cerevisiae cytochrome b residue 129 in the protein which results in the replacement of the normal phenylalanine residue with an alternative amino acid. The fungal DNA sequence according to the above aspect of the invention preferably comprises around 30 nucleotides on either or both sides of the position in the DNA corresponding to one or more of the bases in the triplet, preferably corresponding to the third base in the triplet coding for the amino acid at the position corresponding to S. cerevisiae cytochrome b residue 129 in the protein since this extent of nucleic acid provides the skilled man with all information necessary to design species and mutation specific reagents and/or methods for use in all single nucleotide polymorphism techniques. As used herein the term around 30 means that the sequence may comprise up to 30 nucleotides, for example 5, up to 10, 15, 20, or 25 nucleotides or may comprise more than 30 nucleotides. The invention further provides a fungal DNA sequence encoding all or part of a mutant cytochrome b protein wherein the presence of one or more mutation(s) in said DNA confers resistance to a strobilurin analogue or a compound within the same cross resistance group, said mutation(s) occurring at a position in the DNA corresponding to one or more of the bases in the triplet coding for the amino acid at the position corresponding to S. cerevisiae cytochrome b residue 129 in the protein. In a preferred embodiment of this aspect the invention further provides a fungal DNA sequence encoding all or part of a mutant cytochrome b protein wherein the presence of a mutation in said DNA confers resistance to a strobilurin analogue or a compound within the same cross resistance group, said mutation occurring at a position in the DNA corresponding to the first or third base in the triplet coding for the amino acid at the position corresponding to S. cerevisiae cytochrome b residue 129 in the protein. In the above aspects of the invention the mutation occurring at positions in the DNA corresponding to the first and third base in the triplet coding for the amino acid at the position corresponding to S. cerevisiae cytochrome b residue 129 in the protein are preferably a thymine to a cytosine and a thymine or cytosine to adenine or guanine respectively. The fungal DNA sequence encoding all or part of a mutant cytochrome b protein wherein the presence of one or more mutation(s) in said DNA confers resistance to a strobilurin analogue or a compound within the same cross resistance group, according to the above aspects of the invention is preferably obtainable or obtained from a fungus selected from the group consisting of Plasmopara viticola, Erysiphe graminis f.sp. tritici/hordei, Rhynchosporium secalis, Pyrenophora teres, Mycosphaerella graminicola, Venturia inaequalis, Mycosphaerella fijiensis var. difformis, Sphaerotheca fuliginea, Uncinula necator, Colletotrichum graminicola, Pythium aphanidermatum, Colletotrichum gloeosporioides, Oidium lycopersicum, Phytophthora infestans, Leveillula taurica, Pseudoperonospora cubensis, Alternaria solani, Rhizoctonia solani, Mycosphaerella musicola, Cercospora arachidola, Colletotrichum acutatum, Wilsonomyces carpophillum, Didymella bryoniae, Didymella lycopersici, Peronospora tabacina, Puccinia recondita and Puccinia horiana, preferably from the group consisting of Plasmopara viticola, Erysiphe graminisf.sp. tritici/hordei, Rhynchosporium secalis, Pyrenophora teres, Mycosphaerella graminicola, Venturia inaequalis, Mycosphaerella fijiensis var. difformis, Sphaerotheca fuliginea, Uncinula necator, Colletotrichum graminicola, Pythium aphanidermatum, Colletotrichum gloeosporioides, Oidium lycopersicum, Phytophthora infestans, Leveillula taurica, Pseudoperonospora cubensis, Alternaria solani, Rhizoctonia solani, Didymella bryoniae, Didymella lycopersici, Mycosphaerella musicola and Cercospora arachidola. The invention extends also to DNA sequences comprising all or part of the sequences provided in Table 4 wherein the residue at a position in the DNA corresponding to the first base in the triplet coding for the amino acid at the position corresponding to S. cerevisiae cytochrome b residue 129 in the protein is a cytosine residue. Such sequences, including those comprising the sequences described in Table 4 form a further aspect of the invention. TABLE 4 Tracts of plant pathogen cytochrome b gene sequence where the residue (shown in bold) corresponding to the first base in the codon at the position corresponding to S. cerevisiae cytochrome b residue 129 in the protein is a cytosine residue and, as a result, encodes leucine. Species Sequence Plasmopara viticola 5′TTATGGTGTTCAGGGGTAAT (cDNA & genomic) TATTTTTATTTTAATGATGGCG ACTGCACTTATGGGTTATG 3′ Rhynchosporium secalis 5′GTATGAACAATAGGTACATT (cDNA & genomic) TATATTCATATTAATGATCGTT ACAGCACTCTTGGGTTATG 3′ Pyrenophora teres 5′GTATGAACTATTGGTACTGT (cDNA) TATCTTTATCTTAATGATGGCT ACAGCCCTCCTGGGTTACG 3′ Pyrenophora teres 5′CGCTATACAGATAAATTTAG (genomic) GTTGTAGTTAGCCGGAACTTAG ACAGCCCTCCTGGGTTACCAAC ATAGCCCAAAATGGTTTAATAT AAGTAATAAAAAAAG 3′ Mycosphaerella graminicola 5′ACATGAACAATCGGTACTAT (cDNA & genomic) AATACTAGTTCTGATGATGGCA ACCGCACTCTTAGGGTATG 3′ Mycosphaerella fijiensis 5′GTATGAGTTATAGGTACTAT var. difformis TATATTAGTTCTAATGATGGCA (cDNA & genomic) ACTGCCCTTTTAGGGTATG 3′ Sphaerotheca fuliginea 5′CATTAGGTGTAGTTATATTC (cDNA) ATATTAATGATCGTTACTGCAC TCCTGGGTTATG 3′ Uncinula necator 5′CAATTGGTACAGTAATATTC (cDNA) ATTTTAATGATGGCTACAGCAC TCTTGGGTTATG 3′ Colletotrichum graminicola— 5′GTTTGAGTTATAGGTGCTAT Cgr1 (genomic & cDNA) AATACTTGTAGCTATGATGGGT ATAGGTCTCTTAGGGTATGTTT ACCTTACGGACAAATGTCATTA TGAGGTGCTACAGT 3′ Colletotrichum graminicola— 5′GTTTGAGTTATAGGTTGTAT Cgr2 (genomic & cDNA) AATACTTGTAGCTATGATGGGT ATAGGTCTCTTAGGATATGTTT TACCTTACGGACAAATGTCATT ATGAGGTGCTACAGT 3′ Colletotrichum graminicola— 5′GTTTGAGTTATAGGTACTAT Cgr3 (cDNA) AATACTTGTAGCTATGATGGGT ATAGGTCTCCTGGGTTATGTTT TACCTTACGGACAAATGTCACT ATGAGGTGCAACTGT 3′ Colletotrichum graminicola— 5′GTTTGAGTTATAGGTACTAT Cgr3 (genomic) AATACTTGTAGCTATGATGGGT ATAGGTCTCCTGGGTTACTTCA ACATAGCCCAAAATGATATGCA ATTATTAGGATTTCA 3′ Pythium aphanidermatum 5′TTATGGTGTTCAGGTGTTGT (genomic & cDNA) TATTTTTATTTTAATGATGGCA ACAGCTCTCATGGGTTATG 3′ Colletotrichum 5′GTTTGAGTTATAGGTGCTAT gloeosporioides—chilli AATACTTGTAGCTATGATGGGT (genomic & cDNA) ATAGGTCTCCTGGGTTATG 3′ Colletotrichum 5′GTTTGAGTAATAGGTGCTAT gloeosporioides—mango AATTCTTGTAGCTATGATGGGT (genomic & cDNA) ATAGGTCTCTTGGGTTATGTTT TACCTTACGGGCAAATGTCATT ATGAGGTGCAACAGT 3′ Oidium lycopersicum 5′ACATGAACTATAGGTACAGT (cDNA) TATATTCATATTAATGATGGCT ACAGCACTCCTGGGTTATG 3′ Leveillula taurica—Lt1 5′ACATGAACAATAGGTGTGGT (cDNA) AATATTTATATTAATGATGGCT ACAGCTCTCTTGGGTTATGTTT TACCGTACGGTCAAATGAGTTT ATGAGGTGCAACAGT 3′ Leveillula taurica—Lt4 5′ACATGAACAATAGGTGTTGT (cDNA) AATATTTATATTAATGATGGCT ACAGCTCTCCTAGGTTACGTTT TACCATACGGACAAATGTCATT ATGAGGTGCAACAGT 3′ Leveillula taurica—Lt2 5′ACATGAACTATTGGTGTTGT (cDNA) TATCTTTATATTAATGATGGCT ACTGCCCTTTTAGGATATGTTT ACCATATGGTCAAATGAGTTTA TGAGGTGCTACAGT 3′ Leveillula taurica—Lt3 5′ATGAACAATTGGTACAGTAA (cDNA) TATTCATATTAATGATGGCTAC TGCACTCCTGGGTTATGTTCTA CCTTTGGACAGATGTCGCTCTG CGGTGCAACCGT 3′ Pseudoperonospora cubensis 5′TTATGGTGTTCAGGTGTTAT (cDNA & genomic) TATTTTTATTTTAATGATGGCA ACAGCTCTTATGGGTTATG 3′ Alternaria solani 5′GTATGAACTATTGGTACTGT (cDNA & genomic) TATCTTTATCTTAATGATGGCT ACAGCTCTCCTGGGTTATG 3′ Cercospora arachidola 5′TTATGATCTATTGGAGTTAT (cDNA & genomic) AATTTTATTCTTATGATGGCAA TAGCCCTCTTAGGATATG 3′ Rhizoctonia solani 5′CTATCGGAGTTGTTATGCTT (cDNA) GTTATGATGATGGGGATCGCAC TTTTAGGTTATG 3′ Mycosphaerella musicola 5′GTATGAGTTATAGGTACTAT (genomic & cDNA) TATATTAGTTCTAATGATGGCT ACCGCCCTTTTAGGATATG 3′ Didymella bryoniae—Db1 5′GTATGAACAATGGTACTGTT (cDNA) ATCTTTATCTTAATGATGGCTA CAGCTCTCCTGGGTATGTTCTT CCTTATGGGCAAATGTCATTAT GAGGTGCAACTGT 3′ Didymella bryoniae—Db2 5′GTGTGAACAATTGGTACTGT (cDNA) TATCTTTATCTTAATGATGGCT ACAGCTCTCCTGGGTTATGTGC TGCCCTACGGGCAGATGTCATT ATGAGGTGCTACAGT3′ Didymella lycopersici 5′GTATGAACAATTGGTACTGT (cDNA) TATCTTTATCTTAATGATGGCT ACAGCTCTCCTGGGTTATGTTC TTCCTTATGGGCAAATGTCATT ATGAGGTGCTACAGT 3′ The invention extends also to DNA sequences comprising all or part of the sequences provided in Table 5 wherein the residue at a position in the DNA corresponding to the third base in the triplet coding for the amino acid at the position corresponding to S. cerevisiae cytochrome b residue 129 in the protein is an adenine residue. Such sequences form a further aspect of the invention: TABLE 5 Tracts of plant pathogen cytochrome b gene sequence where the residue (shown in bold) corresponding to the third base in the codon at the position corresponding to S. cerevisiae cytochrome b residue 129 in the protein is an adenine residue and, as a result, encodes leucine. Species Sequence Plasmopara viticola 5′TTATGGTGTTCAGGGGTAAT (cDNA & genomic) TATTTTTATTTTAATGATGGCG ACTGCATTAATGGGTTATG 3′ Rhynchosporium secalis 5′GTATGAACAATAGGTACATT (cDNA & genomic) TATATTCATATTAATGATCGTT ACAGCATTATTGGGTTATG 3′ Pyrenophora teres 5′GTATGAACTATTGGTACTGT (cDNA) TATCTTTATCTTAATGATGGCT ACAGCCTTACTGGGTTACG 3′ Pyrenophora teres 5′CGCTATACAGATAAATTTAG (genomic) GTTGTAGTTAGCCGGAACTTAG ACAGCCTTACTGGGTTACCAAC ATAGCCCAAAATGGTTTAATAT AAGTAATAAAAAAAG 3′ Mycosphaerella graminicola 5′ACATGAACAATCGGTACTAT (cDNA & genomic) AATACTAGTTCTGATGATGGCA ACCGCATTATTAGGGTATG 3′ Mycosphaerella fijiensis 5′GTATGAGTTATAGGTACTAT var. difformis TATATTAGTTCTAATGATGGCA (cDNA & genomic) ACTGCCTTATTAGGGTATG 3′ Sphaerotheca fuliginea 5′CATTAGGTGTAGTTATATTC (cDNA) ATATTAATGATCGTTACTGCAT TACTGGGTTATG 3′ Uncinula necator 5′CAATTGGTACAGTAATATTC (cDNA) ATTTTAATGATGGCTACAGCAT TATTGGGTTATG 3′ Colletotrichum graminicola— 5′GTTTGAGTTATAGGTGCTAT Cgr1 (genomic & cDNA) AATACTTGTAGCTATGATGGGT ATAGGTTTATTAGGGTATGTTT TACCTTACGGACAAATGTCATT ATGAGGTGCTACAGT 3′ Colletotrichum graminicola— 5′GTTTGAGTTATAGGTTGTAT Cgr2 (genomic & cDNA) AATACTTGTAGCTATGATGGGT ATAGGTTTATTAGGATATGTTT TACCTTACGGACAAATGTCATT ATGAGGTGCTACAGT 3′ Colletotrichum graminicola— 5′GTTTGAGTTATAGGTACTAT Cgr3 (cDNA) AATACTTGTAGCTATGATGGGT ATAGGTTTACTGGGTTATGTTT TACCTTACGGACAAATGTCACT ATGAGGTGCAACTGT 3′ Colletotrichum graminicola— 5′GTTTGAGTTATAGGTACTAT Cgr3 (genomic) AATACTTGTAGCTATGATGGGT ATAGGTTTACTGGGTTACTTCA ACATAGCCCAAAATGATATGCA ATTATTAGGATTTCA 3′ Pythium aphanidermatum 5′TTATGGTGTTCAGGTGTTGT (genomic & cDNA) TATTTTTATTTTAATGATGGCA ACAGCTTTAATGGGTTATG 3′ Colletotrichum 5′GTTTGAGTTATAGGTGCTAT gloeosporioides—chilli AATACTTGTAGCTATGATGGGT (genomic & cDNA) ATAGGTTTACTGGGTTATG 3′ Colletotrichum 5′GTTTGAGTAATAGGTGCTAT gloeosporioides—mango AATTCTTGTAGCTATGATGGGT (genomic & cDNA) ATAGGTTTATTGGGTTATGTTT TACCTTACGGGCAAATGTCATT ATGAGGTGCAACAGT 3′ Oidium lycopersicum 5′ACATGAACTATAGGTACAGT (cDNA) TATATTCATATTAATGATGGCT ACAGCATTACTGGGTTATG 3′ Leveillula taurica—Lt1 5′ACATGAACAATAGGTGTGGT (cDNA) AATATTTATATTAATGATGGCT ACAGCTTTATTGGGTTATGTTT TACCGTACGGTCAAATGAGTTT ATGAGGTGCAACAGT 3′ Leveillula taurica—Lt4 5′ACATGAACAATAGGTGTTGT (cDNA) AATATTTATATTAATGATGGCT ACAGCTTTACTAGGTTACGTTT TACCATACGGACAAATGTCATT ATGAGGTGCAACAGT 3′ Leveillula taurica—Lt2 5′ACATGAACTATTGGTGTTGT (cDNA) TATCTTTATATTAATGATGGCT ACTGCCTTATTAGGATATGTTT TACCATATGGTCAAATGAGTTT ATGAGGTGCTACAGT 3′ Leveillula taurica—Lt3 5′ATGAACAATTGGTACAGTAA (cDNA) TATTCATATTAATGATGGCTAC TGCATTACTGGGTTATGTTCTA CCTTTCGGACAGATGTCGCTCT GGGGTGCAACCGT 3′ Pseudoperonospora cubensis 5′TTATGGTGTTCAGGTGTTAT (cDNA & genomic) TATTTTTATTTTAATGATGGCA ACAGCTTTAATGGGTTATG 3′ Alternaria solani 5′GTATGAACTATTGGTACTGT (cDNA & genomic) TATCTTTATCTTAATGATGGCT ACAGCTTTACTGGGTTATG 3′ Cercospora arachidola 5′TTATGATCTATTGGAGTTAT (cDNA & genomic) AATTTTAGTTCTTATGATGGCA ATAGCCTTATTAGGATATG 3′ Rhizoctonia solani 5′CTATCGGAGTTGTTATGCTT (cDNA) GTTATGATGATGGGGATCGCAT TATTAGGTTATG 3′ Mycosphaerella musicola 5′GTATGAGTTATAGGTACTAT (genomic & cDNA) TATATTAGTTCTAATGATGGCT ACCGCCTTATTAGGATATG 3′ Didymella bryoniae—Db1 5′GTATGAACAATTGGTACTGT (cDNA) TATCTTTATCTTAATGATGGCT ACAGCTTTACTGGGTTATGTTC TTCCTTATGCGCAAATGTCATT ATGAGGTGCAACTGT 3′ Didymella bryoniae—Db2 5′GTGTGAACAATTGGTACTGT (cDNA) TATCTTTATCTTAATGATGGCT ACAGCTTTACTGGGTTATGTGC TGCCCTACGGGCAGATGTCATT ATGAGGTGCTACAGT 3′ Didymella lycopersici 5′GTATGAACAATTGGTACTGT (cDNA) TATCTTTATCTTAATGATGGCT ACAGCTTTACTGGGTTATGTTC TTCCTTATGGGCAAATGTCATT ATGAGGTGCTACAGT 3′ The invention extends also to DNA sequences comprising all or part of the sequences provided in Table 6 wherein the residue at a position in the DNA corresponding to the third base in the triplet coding for the amino acid at the position corresponding to S. cerevisiae cytochrome b residue 129 in the protein is a guanine residue. Such sequences form a further aspect of the invention. TABLE 6 Tracts of plant pathogen cytochrome b gene sequence where the residue (shown in bold) corresponding to the third base in the codon at the position corresponding to S. cerevisiae cytochrome b residue 129 in the protein is a guanine residue and, as a result, encodes leucine. Species Sequence Plasmopara viticola 5′TTATGGTGTTCAGGGGTAAT (cDNA & genomic) TATTTTTATTTTAATGATGGCg ACTGCATTGATGGGTTATG 3′ Rhynchosporium secalis 5′GTATGAACAATAGGTACATT (cDNA & genomic) TATATTCATATTAATGATCGTT ACAGCATTGTTGGGTTATG 3′ Pyrenophora teres 5′GTATGAACTATTGGTACTGT (cDNA) TATCTTTATCTTTATCTTAATG ATGGCTACAGCCTTGCTGGGTT ACG 3′ Pyrenophora teres 5′CGCTATACAGATAAATTTAG (genomic) GTTGTAGTTAGCCGGAACTTAG ACAGCCTTGCTGGGTTACCAAC ATAGCCCAAAATGGTTTAATAT AAGTAATAAAAAAAG 3′ Mycosphaerella graminicola 5′ACATGAACAATCGGTACTAT (cDNA & genomic) AATACTAGTTCTGATGATGGCA ACCGCATTGTTAGGGTATG 3′ Mycosphaerella fijiensis 5′GTATGAGTTATAGGTACTAT var. difformis TATATTAGTTCTAATGATGGCA (cDNA & genomic) ACTGCCTTGTTAGGGTATG 3′ Sphaerotheca fuliginea 5′CATTAGGTGTAGTTATATTC (cDNA) ATATTAATGATCGTTACTGCAT TGCTGGGTTATG 3′ Uncinula necator 5′CAATTGTACAGTAATATTCA (cDNA) TTTTAATGATGGCTACAGCATT GTTGGGTTATG 3′ Colletotrichum graminicola— 5′GTTTGAGTTATAGGTGCTAT Cgr1 (genomic & cDNA) AATACTTGTAGCTATGATGGGT ATAGGTTTGTTAGGGTATGTTT TACCTTACGGACAAATGTCATT ATGAGGTGCTACAGT 3′ Colletotrichum graminicola— 5′GTTTGAGTTATAGGTTGTAT Cgr2 (genomic & cDNA) AATACTTGTAGCTATGATGGGT ATAGGTTTGTTAGGATATGTTT TACCTTACGGACAAATGTCATT ATGAGGTGCTACAGT 3′ Colletotrichum graminicola— 5′GTTTGAGTTATAGGTACTAT Cgr3 (cDNA) AATACTTGTAGCTATGATGGGT ATAGGTTTGCTGGGTTATGTTT TACCTTACGGACAAATGTCACT ATGAGGTGCAACTGT 3′ Colletotrichum graminicola— 5′GTTTGAGTTATAGGTACTAT Cgr3 (genomic) AATACTTGTAGCTATGATGGGT ATAGGTTTGCTGGGTTACTTCA ACATAGCCCAAAATGATATGCA ATTATTAGGATTTC A 3′ Pythium aphanidermatum 5′TTATGGTGTTCAGGTGTTGT (genomic & cDNA) TATTTTTATTTTAATGATGGCA ACAGCTTTGATGGGTTATG 3′ Colletotrichum 5′GTTTGAGTTATAGGTGCTAT gloeosporioides—chilli AATACTTGTAGCTATGATGGGT (genomic & cDNA) ATAGGTTTGCTGGGTTATG 3′ Colletotrichum 5′GTTTGAGTAATAGGTGCTAT gloeosporioides—mango AATTCTTGTAGCTATGATGGGT (genomic & cDNA) ATAGGTTTGTTGGGTTATGTTT TACCTTACGGGCAAATGTCATT ATGAGGTGCAACAGT 3′ Oidium lycopersicum 5′ACATGAACTATAGGTACAGT (cDNA) TATATTCATATTAATGATGGCT ACAGCATTGCTGGGTTATG 3′ Leveillula taurica—Lt1 5′ACATGAACAATAGGTGTGGT (cDNA) AATATTTATATTAATGATGGCT ACAGCTTTGTTGGGTTATGTTT TACCGTACGGTCAAATGAGTTT ATGAGGTGCAACAGT 3′ Leveillula taurica—Lt4 5′ACATGAACAATAGGTGTTGT (cDNA) AATATTTATATTAATGATGGCT ACAGCTTTGCTAGGTTACGTTT TACCATACGGACAAATGTCATT ATGAGGTGCAACAGT 3′ Leveillula taurica—Lt2 5′ACATGAACTATTGGTGTTGT (cDNA) TATCTTTATATTAATGATGGCT ACTGCCTTGTTAGGATATGTTT TACCATATGGTCAAATGAGTTT ATGAGGTGCTACAGT 3′ Leveillula taurica—Lt3 5′ATGAACAATTGGTACAGTAA (cDNA) TATTCATATTAATGATGGCTAC TGCATTGCTGGGTTATGTTCTA CCTTTCGGACAGATGTCGCTCT GGGGTGCAACCGT 3′ Pseudoperonospora cubensis 5′TTATGGTGTTCAGGTGTTAT (cDNA & genomic) TATTTTTATTTTAATGATGGCA ACAGCTTTGATCGGGTTATG3′ Alternaria solani 5′GTATGAACTATTGGTACTGT (cDNA & genomic) TATCTTTATCTTAATGATGGCT ACAGCTTTGCTGGGTTATG 3′ Cercospora arachidola 5′TTATGATCTATTGGAGTTAT (cDNA & genomic) AATTTTAGTTCTTATGATGGCA ATACCCTTGTTAGGATATG 3′ Rhizoctonia solani 5′CTATCGGAGTTGTTATGCTT (cDNA) GTTATGATGATGGGGATCGCAT TGTTAGGTTATG 3′ Mycosphaerella musicola 5′GTATGAGTTATAGGTACTAT (genomic & cDNA) TATATTAGTTCTAATGATGGCT ACCGCCTTGTTAGGATATG 3′ Didymella bryoniae—Db1 5′GTATGAACAATTGGTACTGT (cDNA) GTATCTTTATCTTAATGATGCT ACAGCTTTGCTGGGTTATGTTC TTCCTTATGGGCAAATGTCATT ATGAGGTGCAACTGT 3′ Didymella bryoniae—Db2 5′GTGTGAACAATTGGTACTGT (cDNA) TATCTTTATCTTAATGATGGCT ACAGCTTTGCTGGGTTATGTGC TGCCCTACGGGCAGATGTCATT ATGAGGTGCTACAGT 3′ Didymella lycopersici 5′GTATGAACAATTGGTACTGT TATCTTTATCTTAATGATGGCT ACAGCTTTGCTGGGTTATGTTC TTCCTTATGGGCAAATGTCATT ATGAGGTGCTACAGT 3′ The invention extends also to DNA sequences comprising all or part of the sequences provided in Table 7 wherein the residue at a position in the DNA corresponding to the first base in the triplet coding for the amino acid at the position corresponding to S. cerevisiae cytochrome b residue 129 is a cytosine and the residue at the third base in the corresponding codon is an adenine. Such sequences form a further aspect of the invention. TABLE 7 Tracts of plant pathogen cytochrome b gene sequence where the residue (shown underlined) corresponding to the first base in the codon at the position corresponding to S. cerevisiae cytochrome b residue 129 in the protein is a cytosine and the residue shown in bold at the third base of the corresponding codon is an adenine and, as a result, encodes leucine. Species Sequence Plasmopara viticola 5′TTATGGTGTTCAGGGGTAAT (cDNA & genomic) TATTTTTATTTTAATGATGGCG ACTGCACTAATGGGTTATG 3′ Rhynchosporium secalis 5′GTATGAACAATAGGTACATT (cDNA & genomic) TATATTCATATTAATGATCGTT ACAGCACTATTGGGTTATG 3′ Pyrenophora teres 5′GTATGAACTATTGGTACTGT (cDNA) TATCTTTATCTTAATGATGGCT ACAGCCCTACTGGGTTACG 3′ Pyrenophora teres 5′CGCTATACAGATAAATTTAG (genomic) GTTGTAGTTAGCCGGAACTTAG ACAGCCCTACTGGCTTACCAAC ATAGCCCAAAATGGTTTAATAT AAGTAATAAAAAAAG 3′ Mycosphaerella graminicola 5′ACATGAACAATCGGTACTAT (cDNA & genomic) AATACTAGTTCTGATGATGGCA ACCGCACTATTAGGGTATG 3′ Mycosphaerella fijiensis 5′GTATGAGTTATAGGTACTAT var. difformis TATATTAGTTCTAATGATGGCA (cDNA & genomic) ACTGCCCTATTAGGGTATG 3′ Sphaerotheca fuliginea 5′CATTAGGTGTAGTTATATTC (cDNA) ATATTAATGATCGTTACTGCAC TACTGGGTTATG 3′ Uncinula necator 5′CAATTGGTACAGTAATATTC (cDNA) ATTTTAATGATGGCTACAGCAC TATTGGGTTATG 3′ Colletotrichum graminicola— 5′GTTTGAGTTATAGGTGCTAT Cgr1 (genomic & cDNA) AATACTTGTAGCTATGATGGGT ATAGGTCTATTAGGGTATGTTT TACCTTACGGACAAATGTCATT ATGAGGTGCTACAGT 3′ Colletotrichum graminicola— 5′GTTTGAGTTATAGGTTGTAT Cgr2 (genomic & cDNA) AATACTTGTAGCTATGATGGGT ATAGGTCTATTAGGATATGTTT TACCTTACGGACAAATGTCATT ATGAGGTGCAACAGT 3′ Colletotrichum graminicola— 5′GTTTGAGTTATAGGTACTAT Cgr3 (cDNA) AATACTTGTAGCTATGATGGGT ATAGGTCTACTGGGTTATGTTT TACCTTACGGACAAATGTCACT ATGAGGTGCAACTGT 3′ Colletotrichum graminicola— 5′GTTTGAGTTATAGGTACTAT Cgr3 (genomic) AATACTTGTAGCTATGATGGGT ATAGGTCTACTGGGTTACTTCA ACATAGCCCAAAATGATATGCA ATTATTAGGATTTCA 3′ Pythium aphanidermatum 5′TTATGGTGTTCAGGTGTTGT (genomic & cDNA) TATTTTTATTTTAATGATGGCA ACAGCTCTAATGGGTTATG 3′ Colletotrichum 5′GTTTGAGTTATAGGTGCTAT gloeosporioides—chilli AATACTTGTAGCTATGATGGGT (genomic & cDNA) ATAGGTCTACTGGGTTATG 3′ Colletotrichum 5′GTTTGAGTAATAGGTGCTAT gloeosporioides—mango AATTCTTGTAGCTATGATGGGT (genomic & cDNA) ATAGGTCTATTGGGTTATGTTT TACCTTACGGGCAAATGTCATT ATGAGCTGCAACAGT 3′ Oidium lycopersicum 5′ACATGAACTATAGGTACAGT (cDNA) TATATTCATATTAATGATGGCT ACAGCACTACTGGGTTATG 3′ Leveillula taurica—Lt1 5′ACATGAACAATAGGTGTGGT (cDNA) AATATTTATATTAATGATGGCT ACAGCTCTATTGGGTTATGTTT TACCGTACGGTCAAATGAGTTT ATGAGGTGCAACAGT 3′ Leveillula taurica—Lt4 5′ACATGAACAATAGGTGTTGT (cDNA) AATATTTATATTAATGATGGCT ACAGCTCTACTAGGTTACGTTT TACCATACGGACAAATGTCATT ATGAGGTGCAACAGT 3′
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