The virulence spectrum of leaf rust and the status of leaf rust resistance in Nepalese wheats
1994
Karki, C.B. (National Agricultural Research Center, Khumaltar (Nepal).Central Plant Pathology Division)
Leaf rust caused by Puccinia recondita f.sp. tritici is a major disease of wheat in the terai region of Nepal. It has reduced grain yield by 14 with a moderate infection. The leaf rust pathogen is known to survive in self-sown wheat plants in the higher hill regions of the country. Fourteen different pathotypes of P. recondita f.sp. tritici have been recorded in Nepal, attacking many of the resistant genes present in the Nepalese cultivars. Twelve leaf rust- resistant genes Lr 1,3,10,13,14a,16,17,23,26,27,31, and 34 were postulated from 25 promising and recommended varieties in Nepal. Lr13 and Lr 23 were the genes most frequently found. Among the list of future strategies, emphasis will be on the development of a complete map of virulence and avirulence of pathotypes present in the leaf rust pathogen population and development of wheat varieties with durable and adult plant resistance and having a wide genetic base with slow rusting characteristics
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