سلالات الفيزيولوجية لفطر الصدأ الأصفر على القمح Puccinia striiformis f. sp. tritici في سورية خلال الفترة 1994-1996

الملخص EN

The objectives of this study was to monitor the prevailing physiological races of wheat yellow rust ([Puccinia striiformis west, f.

sp .trtici) and their virulence in Syria during three seasons (1993/94, 1994/95 and 1995/96).

Wheat yellow rust differential cultivars were used and planted either in the field at different locations (Al-Hasskh/Al- Kamishly, Tel Hadya and Al- Ghab) or under controlled conditions.

Results showed that 14 yellow rust races (4E0, 6E0, 6E18, 6E134, 6E144,6E148,6E150, 20E148, 38E128, 38E134, 38E150, 82E16,134E146,166E150) were present in wheat fields during this study.

Some races were found in one location and during one season only (4E0,6E144 and 166E150 ), whereas others were frequently encountered during all seasons in one or more locations (6E0 and 38E150 ).

The virulence analysis indicated occurrence of variation in virulence among the races, where 4E0 was the weakest race at Al- Ghab site and 166E150 was the most virulent race, which was discovered recently at Tel Hadya site.