VIRULENCES AND PATHOGENICETY ASSOCIATIONS IN UCCINIA GRAMINIS f. sp. TRITICI IN EGYPT DURING 989/90 AND 1990/91 SEASONS

EL-DAOUDI, YOUSEF H.; ABUEL- NAGA, SALAH A.; SHAFIK, IKHALS; EL-NASHAR, FATEN K.; MOSTAFA, EL-SAYED E.; KHALIFA, MOHAMED O.

doi:10.21608/ejar.1995.441880

VIRULENCES AND PATHOGENICETY ASSOCIATIONS IN UCCINIA GRAMINIS f. sp. TRITICI IN EGYPT DURING 989/90 AND 1990/91 SEASONS

Document Type : Original Article

Authors

Plant Pathology Institute, Agriculture Research Center, Giza, Egypt.

10.21608/ejar.1995.441880

Abstract

Wheat stem rust survery during 1989/91 revealed the existence of 7 physiologic races i.e. 11,34,17,14,24,39 and 285 and 6 races i.e.11,118 , 15,17,24 and 34, respectively . Races,11,34,24 and 17 were the most frequent in both seasons .Virulence analysis of 96 and 78 stem rust single isolates on 12 wheat monogenic lines resulted in 37 and 41 virulence formulae during the two seasons , respectively . Most of the tested isolates were found virulent. virulences were recorded to sr30 ,11, 8a ,24 and 37 (Tt-2) in 1989/90 and to sr 24 ,37 Gt,8a,30 and 11 in 1990/91 . Sr 9e,26 and to some extent sr27 proved their effectiveness against stem rust population during both seaons.