received for the wheat, the price of the fungicide and the percent yield increase from using the fungicide. Situations will differ significantly according to geographical areas and cropping conditions. Spot blotch in particular is a very aggressive disease, and under a favourable environment, spraying at one- to two-week intervals for as long as necessary may be needed to maintain the disease under control. For general information on management of the disease visit Ohio State University Link and FAO link Breeding for resistance The wheat cultivars of South Asia have only low to moderate levels of resistance to spot blotch. However, genetic variation for resistance has been reported in a few wheat cultivars. The best sources of resistance, to date, were identified in the Brazilian and Zambian wheat lines. Recently, a few Chinese wheat genotypes from the Yangtze River valley were identified with acceptable levels of resistance to spot blotch. The following genotypes has been reported to have satisfactory level of resistance, although complete resistance or immunity is lacking: 1 SW 89-5193 2 SW 89-3060 3 SW 89-5422 4 Chirya 7 5 Ning 8319 6 NL 781 7 Croc 1/A. sq.// Borl 8 Chirya 3 9 G162 10 Chirya 1 11 Yangmai-6 12 NL 785 The field resistance governed by Chirya-3 and Milan / Shanghai 7 was found under monogenic control Similarly resistant genotypes Acc. No. 8226, Mon/Ald, Suzhoe#8 from India are found to possess three genes for resistance. A study was conducted to determine microsatellite markers associated with resistance in the F7 progeny from a cross between the spot blotch-susceptible Sonalika and resistant G162 wheat genotypes. 15 polymorphic markers showed association with two bulks, one each of progeny with low and with high spot blotch severity. One of the interesting phenomena associated with foliar blight in some of susceptible cultivars is tolerance (low yield loss even at very high level of disease severity). In addition, the resistance seems to be associated with late maturity (which is an undesirable characteristic as late maturing genotypes need to face more heat stress than early ones), complete understanding of physiological association may aid to complete understanding of the host-pathogen system. Rosyara et al. reported that the AUDPC showed a significant negative correlation with the width of large vascular bundles, percentage of small vascular bundles with two girders and the number of large veins. Also the AUDPC was positively correlated with the distance between adjacent