Abstract
Schizaphis graminum (Rondani) displayed differential preference reactions when given a choice of resistant or susceptible sorghums. Resistant lines PI 264453, IS 809, KS 30, and SA 7536-1 were less preferred than susceptible sorghum Tx 2536 and Tx 7000. A similar response was shown for F1 hybrids of susceptible X resistant lines but to a lesser degree. Duration of stadia was increased, whereas progeny per adult, adult longevity, and length of reproductive period were decreased for greenbugs reared on resistant sorghums. Nymphal mortality did not differ in resistant or susceptible sorghums. Honeydew excretion by aphids on resistant sorghums was generally less than on susceptible sorghums, which indicated reduced feeding.
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