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Published in Crop Sci 21:628-629 (1981)
© 1981 Crop Science Society of America
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Isolation Requirements for Foundation Alfalfa Seed Fields1

D. E. Brown, W. R. Kehr and G. R. Manglitz2

Two alfalfa (Medicago sativa L.) cultivars in commercial production were used to study isolation distance for foundation seed production using insect resistance traits as genetic markers. Twenty-one seed samples were obtained for comparison with foundation and certified seed lots. Spotted alfalfa aphid [Therioaphis maculata (Buckton)] resistance values indicated adequate isolation at 0.4 km (1,320 feet) and no shift in resistance from breeder seed to the foundation seed generation. Resistance to pea aphid [Acyrthosiphon pisum (Harris)] could not be used to measure cross-fertilization between cultivars because the range of resistance overlapped between cultivars.

Key Words: Medicago sativa L. • Pea aphid • Spotted alfalfa aphid • Megachile rotundata (F.) • Cross-fertilization • Therioaphis maculata (Buckton) • Acyrthosiphon pisum (Harris)

1 Contribution from cooperative investigations by Land O'Lakes, Inc., USDA-SEA-AR, and the Nebraska Agric. Exp. Stn. Published with the approval of the Director as Paper No. 6057, Journal Series, Nebraska Agric. Exp. Stn. Research reported was conducted under Project Numbers 12-005 and 17-027.

2 Senior agronomist, Land O'Lakes, Inc., Route 6, Caldwell, ID 83605; research agronomist and research entomologist, USDA, SEA, AR, Dep. of Agronomy and Dep. of Entomology, Univ. of Nebraska, Lincoln, NE 68583, respectively.

Received for publication October 17, 1980.




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