Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 7:382-384 (1967)
© 1967 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Breeding Alfalfa for Resistance to the Stem Nematode, Ditylenchus dipsaci1

R. T. Sherwood, J. W. Dudley, T. H. Busbice and C. H. Hanson2

An experimental synthetic, combining agronomic characteristics of Flemish alfalfa with stem nematode resistance equivalent to that found in ‘Lahontan’, was developed largely by backcrossing. Selections were made in a naturally infested field. Certain selected plants were further evaluated by inoculating their S1 progeny under controlled conditions in a laboratory.

A second resistant synthetic was developed by recurrent selection in the susceptible variety ‘Cherokee’. Laboratory tests of seedling reaction were the basis for all selections; in each of two successive cycles, mass selection was followed by S1 progeny testing of selected plants.

The procedure followed in developing resistance in the second synthetic appeared to be more efficient than the one used in the first. Results from laboratory tests agreed well with those from field tests, but laboratory evaluation was found to be more reliable and economical for determining resistance.

Key Words: disease resistance • nematode resistance • medicago sativa

1 Joint contribution from the Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, and the North Carolina Agricultural Experiment Station, Raleigh, North Carolina. Published with the approval of the Director of Research as Paper No. 2342 of the Journal Series.

2 Plant Pathologist, Geneticist, and Research Agronomist, respectively, Crops Research Division, ARS, USDA, Raleigh, N. C., and Research Agronomist, Crops Research Division, Beltsville, Md. Present address of J. w. Dudley is Department of Agronomy, University of Illinois, Urbana, III.

Received for publication February 15, 1967.




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