Control of Fusarium virguliforme (sudden death syndrome) with a seed treatment
T. A. MUELLER (1), R. P. Knake (2), J. L. Riggs (3)
(1) Bayer CropScience, Earlham, IA, U.S.A.; (2) Bayer CropScience, Johnston, IA, U.S.A.; (3) Bayer CropScience, Research Triangle Park, NC, U.S.A.
Phytopathology 101:S124

Field results from 2010 testing in a soybean trial with severe symptoms of sudden death syndrome (SDS), causal pathogen Fusarium virguliforme, demonstrated that plots grown from seed treated with L1940-A exhibited little or no visual symptoms of SDS while adjacent plots without L1940-A as a seed treatment had severe symptoms. Later in 2010, green house experiments and a paper towel assay were completed to verify field observations. The paper towel assay resulted in the untreated control seed having 55% of the seeds showing F. virguliforme mycelial growth, while L1940-A at 0.05 mg ai/seed had 2.5%, Poncho/VOTiVO + L1940-A at 0.1 mg ai/seed had 7.5% and L1940-A at the 0.15 mg ai/seed application rate had no seeds with mycelial growth. The green house trial resulted in significantly lower incidence and severity of SDS with treatments that contained L1940-A compared to the untreated control.