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Resistance in Soybeans to a New Race of Root-Knot Nematode¹

A new race of root-knot nematode, Meloidogyne incognita, found in a field on the Wartelle farm in St. Landry Parish, Louisiana, caused severe yield reductions in soybeans [Glycine max L. (Merrill)]. ‘Bragg’ has produced low seed yields on this field even with soil fumigation. Greenhouse screening trials showed that of the soybean cultivars currently in production in Louisiana, Bragg was the most resistant. Several old cultivars and new experimental lines that had shown root-knot nematode resistance in other areas of the U. S. were screened in the greenhouse and field for resistance to this new race. Breeding lines were identified which had a low root-knot index and produced relatively high seed yields. Two breeding lines yielded well but had a moderately high root-knot index. Basic sources of resistance came from ‘Hill,’ ‘Palmetto,’ and ‘Laredo.’

Key Words: Meloidogyne incognita • Glycine max

² Assistant Professor of Agronomy, Louisiana State University; Research Plant Pathologist, and Research Agronomist, Plant Science Research Division, ARS, USDA, Louisiana State University, Baton Rouge, Louisiana 70803, and Delta Branch Research Station, Stoneville, Mississippi 38776, respectively.

Received for publication July 3, 1972.