بررسي تنوع بيوثيپي جمعيت هاي شته روسي گندم DIURAPHIS NOXIA )MORDVILKO( و توان تهاجمي آنها در ايران

Biotypic variation and virulence potential in the Iranian populations of Russian wheat aphid, Diuraphis noxia (Mordvilko)

Biotypic variation among Russian wheat aphid, Diuraphis noxia (Mordvilko) isolates, collected from six different areas of Iran including, Eqlid, Abhar, Brujerd.Dehaqan, Razan and Shabestar were evaluated on resistant and susceptible wheat entries. Dependent variables were damage rating {based on leaf chlorosis, leaf roiling, wilting and death of host plant), host plant dry weight and root length. Multivariate analysis of variance of the data indicated that the damage rating was the best criterion for detecting biotypic variation in D. noxia. The Eqlid, Abhar, Brujerd and Dehaqan isolates were most virulent. The Shabestar isolate was moderately virulent, while the Razan isolate was the least virulent on all plant entries. Also, canonical discriminant anaylsis in most cases correctly classified the virulent and non - virulent isolates in respective groups.