vascular bundles and leaf thickness. The chlorophyll or general health indicators, SPAD and AUSDC values were higher in spot blotch resistant and tolerant genotypes. The findings the study underlined the importance of mesophyll structure and chlorophyllcontent in spot blotch resistance in wheat. Also tolerant genotypes responded in the same way as artificial defoliation showing mechanisms of nutrient balance playing role. Similarly, canopy temperature depression was found associated with foliar blight resistance. Leaf tip necrosis was found to be associated with foliar blight resistance and is suggested as phenotypic marker. Different studies are done to estimate heritability and increase selection efficiency. Heritability estimates were low to high in terms of AUDPC. To increase efficiency of selection use of selection index has been suggested. The index includes days to heading (maturity related trait), thousand kernel weight, and area under foliar blight disease progress curve. References Further reading Joshi, A. K.; R. Chand, S. Kumar, and R. P. Singh. 2004. Leaf Tip Necrosis: A Phenotypic Marker Associated with Resistance to Spot Blotch Disease in Wheat. Crop Sci. 44:792–796. Joshi A. K., S. Kumar, R. Chand and G. Ortiz-Ferrara 2004. Inheritance of resistance to spot blotch caused by Bipolaris sorokiniana in spring wheat. Plant Breeding 123, 213—219 Rosyara, U.R., R.C. Sharma, S.M. Shrestha, and E. Duveiller. 2006. Yield and yield components response to defoliation of spring wheat genotypes with different level of resistance to Helminthosporium leaf blight. Journal of Institute of Agriculture and Animal Science 27. 42–48. or Adlakha, K.L., Wilcoxson, R.D. & Ray-chauduri, S.P. 1984. Resistance of wheat to spot blotch caused by Bipolaris sorokiniana. Plant Dis., 68: 320–321. Alam, K.B., Banu, S.P. & Shaheed, M.A. 1998. The occurrence and significance of spot blotch disease in Bangladesh. In E. Duveiller, H.J. Dubin, J. Reeves & A. McNab, eds. Proc. Int. Workshop Helminthosporium Diseases of Wheat: Spot Blotch and Tan Spot, CIMMYT, El Batan, Mexico, 9–14 Feb 1997, p. 63–66. Mexico, DF, CIMMYT. Annone, J. 1998. Tan spot of wheat in Argentina: Importance and prevailing disease management strategies. In E. Duveiller, H.J. Dubin, J. Reeves & A. McNab, eds. Proc. Int. Workshop Helminthosporium Diseases of Wheat: Spot Blotch and Tan Spot, CIMMYT, El Batan, Mexico, 9–14 Feb 1997, p. 339–345. Mexico, DF, CIMMYT. Bhatta, M.R., Pokharel, D.R., Devkota, R.N., Dubin, H.J., Mudwari, A., Bimb, H.P., Thapa, B.R., Sah, B.P. & Bhandari, D. 1998. Breeding for Helminthosporium blights resistance in Nepal: strategy followed by the