Effect of Seed Treatments on Stand Establishment, Root Necrosis, and Yield of Lupinus albus. R. A. Kuznia, Research Fellow, Northwest Experiment Station, Crookston, MN 56716. R. A. Meronuck, and E. L. Stewart. Professor and Extension Plant Pathologist, and Professor, Department of Plant Pathology, University of Minnesota, St. Paul 55108. Plant Dis. 77:892-895. Accepted for publication 8 April 1993. Copyright 1993 The American Phytopathological Society. DOI: 10.1094/PD-77-0892.

Treatment of seed of white lupine (Lupinus albus) with maneb, captan, thiram, metalaxyl, carboxin, PCNB + ethazol, streptomycin sulfate, or chitosan was evaluated for effect on stand establishment, seedling root discoloration and necrosis, and yield. Seed treatments did not consistently improve stand establishment or affect the number of roots with lesions, constrictions, tip necrosis, or discoloration. Fusarium spp. were isolated more frequently than Rhizoctonia solani AG-4, Pythium spp., Pleiochaeta setosa, or Ascochyta sp., with F. solani being isolated most often. Seed treatment did not consistently result in an increase in yield.