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Virulence of Two Russian Wheat Aphid Biotypes to Eight Wheat Cultivars at Two Temperatures

Dep. of Entomology, Kansas State Univ., Agricultural Research Center-Hays, 1232 240th Ave., Hays, KS 67601

View larger version (18K): [in a new window]   Fig. 1. Changes in mean colony size (±SEM) for two Diuraphis noxia biotypes during first and second generations at each of two constant temperatures. Values are mean colony sizes averaged across eight different wheat cultivars. Individual colonies were each initiated with two fourth instar apterae per plant on Day 0. Asterisks indicate significant differences between biotypes in mean colony size (***, P < 0.001).