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Published in Crop Sci 20:405-407 (1980)
© 1980 Crop Science Society of America
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Crossing Contamination along Contiguous Borders of Certified Alfalfa Seed Fields

D. E. Brown, W. R. Kehr, G. R. Manglitz, J. H. Elgin, Jr. and S. A. Ostazeski2

Multiple pest resistant alfalfa (Medicago sativa L.) cultivars in commercial production were used to study cross-pollination along contiguous borders using contrasting levels of disease and insect resistance. Twenty-eight seed samples were obtained from each of 3 cultivars and 26 from the fourth cultivar. In 110 sample comparisons with foundation and certified lots, only five departures from expected levels of resistance were found. Departures appeared to be random in relation to distance from foreign pollen source and leafcutter bee, Megachile rotundata (F.), locations and were interpreted as sampling variations. Thus the data indicated that isolation requirements for production of certified seed in fields larger than 2 ha using M. rotundata (F.) as pollinators could be less stringent than current standards without sacrificing the integrity of the cultivar.

Key Words: Medicago sativa L • Isolation • Certified seed • Anthracnose • Pea aphid • Spotted alfalfa aphid • Megachile rotundata

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. 5741 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., R. 6, Caldwell, ID 83605; research agronomist and research entomologist, USDA, SEA, AR, NCR, Dep. of Agronomy and Entomology, Univ. of Nebraska, Lincoln, NE 68583; and research agronomist and research plant pathologist, USDA, SEA, AR, NER, PGGI, Field Crops Laboratory, BARC, Beltsville, MD 20705, respectively.

Received for publication August 23, 1979.




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