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Published in Crop Sci 8:15-17 (1968)
© 1968 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Resistance of Alfalfa Varieties to the Potato Leafhopper: Seedling Survival and Field Damage After Infestation1

James A. Webster, E. L. Sorensen and Reginald H. Painter2

Twenty-eight varieties and four experimental populations of Medicago sativa L., were tested in the seedling stage for resistance to the potato leafhopper, Empoasca fabae (Harris). The extremely winter-hardy varieties, ‘Rhizoma,’ ‘Rambler,’ ‘Teton,’ exhibited high seedling survival. In contrast, the nonhardy varieties, ‘African,’ ‘Hairy Peruvian,’ ‘Indian,’ ‘Moapa,’ and ‘Sonora,’ were highly susceptible. The reaction of the Flemish types, ‘Alfa,’ ‘DuPuits,’ and ‘Glacier,’ was similar and intermediate among varieties tested. The Turkistan-derived variety, ‘Lahontan,’ was highly susceptible. ‘Cherokee’ and the populations MSA-11 and MSB-11, which were developed for resistance to yellowing in the field from susceptible source material by recurrent selection, were resistant in greenhouse seedling tests. Experimental synthetics, KS 13 and N. S. 16, rated high for resistance in field and seedling tests.

Field yellowing scores were negatively correlated with seedlings survival in growth chamber tests (r= –0.607*). Repeatability of seedling resistance as determined by survival was demonstrated by a highly significant interannual correlation coefficient (+0.702***) for the unifoliolate growth stage.

Key Words: Medicago sativa L. • L., Empoasca fabae (Harris)

1 Contribution No. 929, Department of Entomology, and No. 1005, Department of Agronomy, Kansas Agricultural Experiment Station, Kansas State University, Manhattan, Kansas, and the Crops Research Division, Agricultural Research Service, USDA. This study was supported in part by Kansas Experiment Station Projects 164 and 409 and by grant no. 12-14-100-7725 (33), Kansas Project No. 5-797, from the Entomology Research Division, ARS, USDA, to the Department of Entomology. Portion of a dissertation to be presented by the senior author to Kansas State University in partial fulfillment of the requirements for the Ph.D. in entomology.

2 Research Assistant, Department of Entomology; Research Agronomist, Crops Research Division, Agricultural Research Service, USDA; and Professor of Entomology, Kansas State University, Manhattan, Kansas 66502.

Received for publication August 2, 1967.




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