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Response of Greenbug-Resistant Grain Sorghum Lines and Hybrids to a Natural Infestation of Greenbugs¹

Three greenbug [Schizaphis graminum (Rondani)]- resistant sorghum [Sorghum bicolor (L.) Moench] lines, 'IS 809,' 'SA 7536-1,' and 'KS 30,' their F₁ hybrids with greenbug-susceptible A lines, three susceptible hybrids, and one susceptible line were planted in yield tests subjected to a natural infestation of greenbugs at Lubbock, Texas in 1971 and 1972. In untreated plots, the mean number of greenbugs per plant was higher and leaf injury from greenbug feeding was greater in susceptible entries than in resistant lines and their hybrids. In greenbug-infested plots, grain yield was significantly reduced only in the early-blooming susceptible line. Hybrids with one resistant parent exhibited enough resistance to control greenbug populations and significantly reduce leaf death from greenbugs feeding on adult plants.

Key Words: Insect resistance • Host plant resistance • Sorghum bicolor (L.) Moench • Schizaphis graminum (Rondani)

² Assistant Professor, Associate Professor, and Assistant Professor, respectively, The Texas Agricultural Experiment Station, Texas A&M University Agricultural Research and Extension Center at Lubbock, Lubbock, TX 79401.

Received for publication October 18, 1973.