Monitoring stripe rust pathotypes in the Horn of Africa, Caucasus, West and Central Asia. (4999)
Authors:
A. Yahyaoui* - ICARDA
M. Naimi - ICARDA, Aleppo, Sirya.
M. El Ahmed - ICARDA, Aleppo, Sirya.
N. Marrawi - ICARDA, Aleppo, Sirya.
O. Abdall - ICARDA, Aleppo, Sirya.
R. Malhotra - ICARDA, Aleppo, Sirya.
Abstract:
Stripe rust is a major foliar disease limiting wheat production in the Caucasus, Central and West Asia, North Africa (CWANA), Nile Valley and the Horn of Africa. In the last two decades evolution of new virulent rust pathotypes has resulted in frequent rust epidemics with significant economic impact in these
regions. Detection of pathogen variation using a series of host differentials has been valuable in providing important insights into the evolution of pathotypes in
response to selection pressure of host resistance genes and such information is indispensable for the development and strategic deployment of host resistance.
Stripe rust race monitoring in CWANA has revealed that race 6E0 (virulent on Yr 6 and Yr A) is the most frequent race in the region and it has been detected every year since 1972. In West Asia, race 38E150 (virulent on Yr 2,Yr6, Yr7, Yr8) was the second most frequent pathotype during the last five years (2000 – 2003), whereas races 134E152 (virulent on YrA, Yr2, Yr 6, Yr7, Yr8, Yr9), 230E150 (virulent on YrA, Yr2, Yr6, Yr7,Yr9,YrSU,YrSD, Yr17,Yr18) and 119E158 (virulent on
YrA,Yr1, Yr2, Yr3, Yr6, Yr7, Yr9, Yr10,Yr17) were detected in Lebanon, Iraq and Yemen, respectively. Thus a wide range of virulent races are evolving in this region causing the breakdown of resistance in wheat.
Speaker Information: Amor Yahyaoui, ICARDA, ICARDA, GP, P.O. Box 5466, Aleppo, ; Phone: +963-21-2213433; E-mail: [email protected]
Session Information: Wednesday, November 3, 2004, 8:00 AM-9:35 AM Presentation Start: 8:35 AM
Keywords: Bread wheat; Stripe Rust Epidemics; Monitoring Rust Races; Durable Disease Resistance
