Effects of Herbicides on Carpogenic Germination of Sclerotinia sclerotiorum. V. L. Radke, Former Graduate Research Assistant, Department of Plant Pathology, University of Wisconsin, Madison 53706. C. R. Grau, Associate Professor, Department of Plant Pathology, University of Wisconsin, Madison 53706. Plant Dis. 70:19-23. Accepted for publication 8 July 1985. Copyright 1986 The American Phytopathological Society. DOI: 10.1094/PD-70-19.

Of nine herbicides investigated, trifluralin, pendimethalin, metribuzin, simazine, and atrazine stimulated carpogenic germination of S. sclerotiorum as measured by the percentage of germinated sclerotia and by numbers of stipes and/or apothecia that developed per sclerotium. Linuron and DNBP inhibited germination and apothecium development, and alachlor caused variable responses. Simazine and atrazine enhanced stipe formation but stipes and apothecia were malformed. Metribuzin, also a triazine, enhanced stipe and apothecial growth without malformations.