Development of a Population of Heterodera glycines Race 5 at Four Soil Temperatures in Minnesota. M. E. Sortland, Research Assistant, Department of Plant Pathology, University of Minnesota, St. Paul 55108. D. H. MacDonald, Professor, Department of Plant Pathology, University of Minnesota, St. Paul 55108. Plant Dis. 70:932-935. Accepted for publication 7 May 1986. Copyright 1986 The American Phytopathological Society. DOI: 10.1094/PD-70-932.

Development of Heterodera glycines race 5 was most rapid at 30 C, populations were largest at 25 C, and some development took place at 20 and 15 C when nematode-infected soybeans were grown in temperature tanks. A maximum of four generations of this nematode could theoretically be produced within one growing season in southern Minnesota.

Keyword(s): Glycine max, life cycle, soybean cyst nematode.