Abstract
Agronomically improved greenbug resistant sorghum, Sorghum bicolor L. (Moench), hybrids infested with fewer greenbugs, Schizaphis graminum (Rondani), were damaged less and produced higher yields than a genetically comparable green bug susceptible hybrid under natural insect infestations at Lubbock, Tex. Yields of resistant hybrids were not significantly increased by insecticide treatment under natural green bug infestations. When large green bug populations were artificially created by excluding predators and parasites with screen cages, yields of resistant hybrids were reduced. Indications are that green bug-resistant hybrids with resistance incorporated from one parent should be sufficient to prevent yield loss by natural green bug population levels.
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