Movement and Disappearance of Dicloran, Iprodione, and Vinclozolin in Peanut and Nonpeanut Soils. Wade H. Elmer, Former Graduate Assistant, Department of Plant Pathology, Physiology, and Weed Science, Virginia Polytechnic Institute and State University, Blacksburg 24061. R. Jay Stipes, Professor, Department of Plant Pathology, Physiology, and Weed Science, Virginia Polytechnic Institute and State University, Blacksburg 24061. Plant Dis. 69:292-294. Accepted for publication 18 October 1984. Copyright 1985 The American Phytopathological Society. DOI: 10.1094/PD-69-292.

The movement and disappearance of dicloran, iprodione, and vinclozolin were studied in Woodstown loamy sand (WLS), a peanut soil; and Lodi Loam (LL), a nonpeanut soil, using polyvinylchloride vertical laboratory percolation soil columns and incubated fungicide-amended soils, respectively. Residues were solvent-extracted and detected by an agar bioassay technique. Dicloran moved a maximum of 10 cm in the LL and 15 cm in the WLS, whereas vinclozolin was detected last at a 25-cm depth in the LL soil column but in all sections (35 cm) of the WLS soil column. Iprodione was detected throughout the entire columns (35 cm) of both soils. Fungicide disappearance at lower concentrations (including the labeled usage rate) was faster at 28 than 21 C and in LL than in WLS.