Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 12:334-336 (1972)
© 1972 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Sorghum Cultivars and Progenies Rated for Resistance to Greenbugs1

D. E. Weibel, K. J. Starks, E. A. Wood, Jr. and R. D. Morrison2

F1 and F2 populations of sorghum plants [Sorghum bicolor (L.) Moench] from the resistant varieties ‘Shallu Grain’ (SA 7536-1), PI 264453, and ‘IS 809’ were scored for damage from the greenbug [Schizaphis graminum (Rondani)] in short rows in flats in the greenhouse. The study was conducted to determine the inheritance of greenbug resistance, to determine the feasibility of transferring the resistance to adapted lines, and to predict the usefulness of the resistance in hybrids. F1 plants gave an intermediate score between resistant and susceptible parents but indicated that one parent in a hybrid could give considerable resistance to greenbugs. Data from F2 populations indicated that the inheritance of resistance probably was controlled by a single incompletely dominant factor, and that breeders should have little difficulty transferring resistance to adapted lines. Average number of dead plants per entry and average reduction in height due to greenbugs were highly correlated with damage scores.

Key Words: Inheritance • Sorghum bicolor (L.) Moench • Schizaphis graminum (Rondani) • Sorghum varieties • Sorghum breeding • Biotype

1 Journal Article 2390 of the Agricultural Experiment Station, Oklahoma State University, Stillwater, Okla. 74074. Research conducted by the Department of Agronomy in cooperation with the Entomology Research Division, Agricultural Research Service, USDA.

2 Professor of Agronomy; Research Entomologist, Entomology Research Division, ARS, USDA; Research Entomologist; Entomology Research Division, ARS, USDA; and Professor of Mathematics and Statistics, respectively, Oklahoma State University, Stillwater, Okla. 74074.

Received for publication November 6, 1971.




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