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.