Resistance of F1 Wheat Plants to Greenbugs and Hessian Fly1

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Abstract
Response of F1 hybrid wheat plants carrying genes for resistance to both Hessian fly, Mayietola destructor (Say), and greenbug, Schizaphis graminum (Rondani), was studied in greenhouse and in insectary at Manhattan, Kansas, 1962 and 1963. Greenbug resistance (gbgb) came from the Dickinson cultivar and Hessian fly resistance (H3H3) from Ottawa and CI 13548. Resistance of an F1 plant could be identified on the basis of insect reproduction (antibiosis) or damage (tolerance) to either insect in the seedling stage and later by damage to mature plants. F1 plants carrying the H3 gene for resistance to Hessian fty were intermediate to parents in damage; larvae of flaxseed were generally smaller and plants supported fewer larvae. F1 plants response to greenbug damage also was intermediate to parents but numbers of nymphs produced were nearly the same on the F1 plants and their parents. Identification of insect resistance in F1 plants from parents will be useful in conducting backcross breeding programs.

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