Distribution of Florida Populations of the Soybean Cyst Nematode with Previously Undescribed Genetic Variation. P. S. Lehman, Nematologist, Florida Department of Agriculture and Consumer Services, Division of Plant Industry, Bureau of Nematology, P.O. Box 1269, Gainesville 32602. R. A. Dunn, Extension Nematologist, Florida Cooperative Extension Service, University of Florida, Gainesville 32611. Plant Dis. 71:68-70. Accepted for publication 6 June 1986. Copyright 1987 The American Phytopathological Society. DOI: 10.1094/PD-71-0068.

Reproduction of 20 Florida populations of the soybean cyst nematode (Heterodera glycines) was tested using standard differential cultivars and lines. In addition to race 3, previously known from Florida, races 2 and 4 were found for the first time in Florida. Two additional types or groups of populations were found that differed in response from previously described races.

Keyword(s): Glycine max, pathotypes, resistance