Predisposition and Nonpreference of Greenbug for Certain Host Cultivars 12

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Abstract
The cultivars “Reno” barley, Hordeum vulgare L.; “Arkwin” oats, Avena sativa L.; “Balbo” rye, Secale cereale L.; and “Ponca” wheat, Triticum aestivum L., which served for culturing greenbugs, Schizaphis graminum (Rondani) (biotype C) prior to testing did not predispose the greenbugs to different preferences for cultivar host species. However, greenbugs reared on “RS 671” sorghum, Sorghum bicolor (L.) Moench, showed a definite preference for sorghum compared with greenbugs cultured on oats, rye and wheat. Overall rye was least preferred and barley most preferred. The culture host cultivar did not influence days to reproduction or nymphs produced per day, but the host on which the greenbug was living had a decided influence on these factors. Nonpreference for resistant “KS 30” sorghum vs. susceptible “RS 671” sorghum was not influenced by the host cultivar on which the greenbug was cultured but decreased with a decrease in temperature.