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Published in Crop Sci 9:363-365 (1969)
© 1969 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Four Recurrent Selection Programs on Two Alfalfa Populations1

R. R. Hill, Jr., C. H. Hanson and T. H. Busbice2

Two broad-based germ plasm pools of alfalfa, Medicago sativa L, were each subjected to four separate programs of recurrent phenotypic selection for resistance to leafhopper yellowing, caused by Empoasca fabae (Harris); spotted alfalfa aphid, Therioaphis maculata (Buckton); bacterial wilt, caused by Corynebacterium insidiosum (McCull) Jens.; and common leafspot, caused by Pseudopeziza medicaginis (Lib.) Sacc. Selection for resistance to these pests was highly effective. A slight reduction in vigor in the aphid-resistant populations was attributed to shifs resulting from selection of a small number of plants in the first cycle of that program. Generally, selection for resistance to a particular pest did not cause significant reduction in levels of resistance to other disease and insect pests developed in previous selection programs. Selection of 75 or more plants in each cycle was recommended.

Key Words: Madicago sativa L. • Empoasca fabae (Harris) • Therioaphis maculata (Buckton) • Corynebacterium insidiosum (McCull) Jens. • Pseudopeziza medicaginis (Lib.) Sacc. • Disease and insect resistance

1 Contribution No. 228 of the U. S. Regional Pasture Research Laboratory, CR, ARS, USDA, University Park, Pa., in cooperation with the 12 Northeastern States and Paper No. 2758 of the Journal Series of the North Carolina State University Agricultural Experiment Station, Raleigh.

2 Research Agronomists, University Park, Pa. 16802; Beltsville, Md. 20705, and Raleigh, N. C. 27607, respectively.

Received for publication November 25, 1968.


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J. F. S. Lamb, M. P. Russelle, and D. M. Fenton
Field-based Selection Method Creates Alfalfa Populations That Differ in Nitrate Nitrogen Uptake
Crop Sci., March 19, 2008; 48(2): 450 - 457.
[Abstract] [Full Text] [PDF]


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