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On a examiné l'effet de 11 fongicides sur six lots de semences de soja (Glycinemax) provenant de l'Ontario en 1986-1987 et contaminés par le Diaporthe phaseolorum var. caulivora (7-76 %) et le D. phaseolorum var. sojae(5-19 %). Le Phomopsis longicolla a également contaminé trois de ces lots à de faibles taux (1-2 %). Le fongicide Vitaflo-280®, un mélange de carbathiine et de thirame, appliqué à trois lots de semences décolorées et ridées, a augmenté l'émergence des plantules de soja, la densité du peuplement à la récolte et le rendement en grain, et a diminué la gravité de l'infection des tiges. Il a été inefficace lorsqu'appliqué à trois lots de semences brillantes et lisses. Il n'existait pas de rapport entre l'efficacité de ce produit et le degré de contamination des semences. Dix autres produits fongicides ont aussi été respectivement efficaces et inefficaces lorsqu'appliqués à des lots de semences ridées et lisses. Les matières actives les plus efficaces ont été le thirame, la carbathiine le bénomyl et le captane, et les produits commerciaux les plus efficaces disponibles en Ontario ont  été le Vitaflo-280®, le Vitavax P®, le Thiram 320F® et l'Anchor®.  L'augmentation maximale du rendement en grain a été 60,5 %.The effect of 11 fungicides on six lots of soybean (Glycine max) seed produced in Ontario in 1986-1987 and contaminated with Diaporthe phaseolorum var. caulivora (7-76%) and D. phaseolorum var. sojae (5-19%) was examined. Phomopsis longicolla also contaminated three of these seed lots at low rates (1-2%). The fungicide Vitaflo-280®, a mix of carbathiin and thiram, increased soybean seedling emergence, plant stand at harvest and seed yield, and decreased the severity of stem infection when applied to three lots of discolored and shrivelled seed, but was ineffective when applied to three lots of bright and smooth seed. The effectiveness of this product was not related to the incidence of contaminated seed. A further 10 fungicidal products were similarly effective and ineffective when applied to shrivelled and smooth seed lots, respectively. The most effective active ingredients were thiram, carbathiin, benomyl and captan, and the most effective commercial products available in Ontario were Vitaflo-280®, Vitavax P®, Thiram 320F®, and Anchor®. The maximum increase in seed yield was 60.5%

Effectiveness of fungicidal seed treatments applied to smooth or shrivelled soybean seeds contaminated by Diaporthe phaseolorum