Yield losses in wheat genotypes caused by stripe rust (Puccinia striifarmis f. sp. tritici) in North Delta, Egypt

Stripe (yellow) rust disease caused by Puccinia striifarmis f. sp. tritici, is a catastrophic wheat in wheat-growing regions around the world. The objective of this study was to investigate potential sources stripe resistance and yield loss forty local varieties at four locations Egypt (Sakha, Mutubas, Qillin Biyala), under yellow pressure compared ‘Morroco’ variety, as control. To determine slow rusting field, following parameters were recorded: final severity (FRS%), average coefficient infection (ACI), relative index (RRI) reduction % 1000 kernel weight. higher second season than first. Seven genotypes (‘Shaka 62’, ‘Shaka 9, 95’, ‘Gemmiza 7’, ‘Sids 14’ ‘Misr 3’) showed high level resistance, FRS% values ranged from 0 20 moderately resistant (MR) during first achieved least value TKW (1.28%) with 3’. Meanwhile, (‘Sakha 93’, ‘Sakha ‘Gim. 7’) remained highly identified have good which these 5R 30 resistant-moderately susceptible (MRMS), ACI ≤12, RRI ≥6 not exceed 12.54%. On other hand, lines; 69’, 88’, 92’, ‘Giza 160’, 163’, ‘Gem 11’, 2’ 6’ exhibited complete susceptibility tested sites, recorded >50. cv. 11’ 2018/2019 highest ≥55, lowest RRI≤4.05 loss% reached 40.69%. These findings could be used national breeding program for Egypt.