Trifluralin Enhancement of Phytophthora Root Rot of Soybean. D. R. Duncan, Research Assistant, Department of Plant Pathology, University of Illinois, Urbana 61801. J. D. Paxton, Associate Professor, Department of Plant Pathology, University of Illinois, Urbana 61801. Plant Dis. 65:435-436. Copyright 1981 American Phytopathological Society. DOI: 10.1094/PD-65-435.

Trifluralin used on soils infested with Phytophthora megasperma var. sojae increased Phytophthora root rot of soybean (Glycine max) plants. The increase ranged from slight to more than 80% death, depending on the inoculum density and the soil condition.

Keyword(s): herbicides, soilborne disease, synergism.