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Host Preferences and Reproduction of Four Cereal Aphids on 20 Avena Selections¹

Host preference and reproduction of Schizaphis graminum (Rondani), Macrosiphum avenae (F.), Rhopalosiphum padi (L.), and R. maidis (Fitch) were tested seedling and mature (dough-stage) plants of nine cultivars and nine experimental lines (Illinois) of Avena sativa L., one of A. strigosa Schreb., and one of A. fatua (L). graminum reproduced less (P < 0.05) on two Illinois lines (IL 70-1556, IL 70-1490) previously identified as bring tolerant to barley, yellow dwarf disease. M. avenae, R. padi, and S. graminum reproduced on both growth stages of the range of Avena selections; there were no differences (P > 0.05) in the responses of M. avenae and R. padi to the Avena selections. R. maidis did not reproduce on mature Avena.

Key Words: Insects • Oats • Vectors of barley yellow dwarf virus

² Research entomologist, North Grain Insects Research Laboratory, SEA-AR-USDA, Brookings, SD 57006; research plant pathologist, SEA-AR-USDA, Urbana, IL 61801; and professor of agronomy, Univ. of Illinois, Urbana.

Received for publication May 29, 1979.