Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 10:584-586 (1970)
© 1970 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Diallel Analyses of Potato Leafhopper Injury to Alfalfa1

W. R. Kehr, R. L. Ogden and S. D. Kindler2

The objectives of this study were to obtain intormation on the genetic basis of leafhopper yellowing due to Empoasca fabae (Harris), and the interrelationships of yellowing with other characters in diallel crosses among six clones of alfalfa, Medicago sativa L., which differed in yellowing. Clones, S1 progeny, and diallel crosses, including reciprocals, were evaluated at two dates in the field. General combining ability effects were more important than specific combining ability effects for leafhopper yellowing, nymphs/gram of dry matter, and protein content in crosses. Reciprocal effects were non-significant sources of variation. Amount of leafhopper yellowing was positively correlated with nymphs/gram of dry matter, but negatively correlated with protein, carotene, and fiber contents. Visually scoring breeding materials for leafhopper yellowing at one date per year is adequate for making progress, provided sufficient nymphs are present to give differential scores on materials of known performance.

Key Words: Alfalfa breeding

1 Cooperative investigations of the Crops and Entomology Research Divisions, Agricultural Research Service, U. S. Department of Agriculture, and the Nebraska Agricultural Experiment Station. Published with the approval of the Director as paper No. 2783, Journal Series, Nebraska Agricultural Experiment Station, Lincoln, Nebr. 68503.

2 Research Agronomist, Crops Research Division, ARS, USDA, and Professor of Agronomy, Department of Agronomy; Assistant Professor, Department of Biochemistry and Nutrition; and Research Entomologist, Entomology Research Division, ARS, USDA, and Assistant Professor of Entomology, Department of Entomology, University of Nebraska, Lincoln, Nebr.

Received for publication March 26, 1970.




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