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Genetic Analyses of the Resistance to Mayetiola destructor (Say) in Hordeum vulgare L.¹

Resistance to Hessian fly (Mayetiola destructor Say) was studied in the F₁, F₂, and F₃, generations following intercrosses among 3 barley varieties and crosses of the 3 to ‘Mars’ and ‘Gull’ translocation stocks. A common dominant factor (symbol proposed Hf hf) was found in ‘Delta’, ‘Nile’, and ‘Abusir’ which governed resistance at cool greenhouse temperatures. The factor was independent of 4 translocation breakpoints which tested one or more arms of chromosomes 1, 2, 3, 4, 6, and 7.

At higher greenhouse temperatures, two complementary dominant genes were necessary to explain resistance in Delta. The second factor pair which was ineffective alone was designated Hf₂ hf₂.

² Formerly Rockefeller Fellow, Purdue University (now Special Lecturer in Genetics, Makerere University College in the University of East Africa); Professor of Agronomy; and Associate Professor of Entomology and Ent. Res. Div., ARS, USDA; respectively.

Received for publication May 12, 1966.