Abbas Kheiri - Plant Protection Department, Abooreyhan Campus, University of Tehran,Iran
Mohsen Fatahi - Faculty Member of Cotton Research Institute,Gorgan,Iran

Field experiments were conducted to evaluate yield and Verticillium resistance in cotton, 6 cultivarswere studied as randomized complete block design with 4 replications in Estahban Research Station,during 2005 to 2006. Disease percent, the index and severity were determinated based on foliarsymptoms.Results showed that Bakhtegan, 818 and B-557 had the least percent (20-29.38%),Severity(1.42-1.62) and index (32.13-45.69) of disease.On the other hand, Varamin had the most percent(%85.63), Severity (3.23) and index (278) of disease. Bakhtegan, 818 and B-557 were significantlydiffered of others in yield.

Cotton, Cultivar, Tolerance, Verticillium