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Distribution of stripe rust virulences of wheat and varietal response in pakistan
Abstract
The didtribution of puccinia striiformis tritici virulences prevalent in nature in the stripe rust zones of the Punjab, north western frontier and Baluchistan during the period 1986-88 is described , high virulsences was observed in Punjab and NWFP on differentials carrying stripe rust resistance genes yr1,yr2, yr6, yr7 and yrA. Similarly pattern of high virulsences was observed on commercial cultivars carrying stripe rust resistance genes yr2, yr6, yr7 and yrA. No virulence was observed in Baluchistan on either the differential hosts or any commercial cultivars except local white which is not known to carry any resistance to stripe rust. Similarly virulence against host genes yr3, yr4, yr5, yr8, yr9. Yr10, yrSu and yr15 was also not found.
