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White mold is a common soybean fungal disease in the upper Midwest where cool, wet conditions are favorable for infection. In these environments, cultural practices and selected genetic tolerance may not be enough to control the disease. Fungicides reduce the impact of white mold most when applied at the R1 growth stage (flowering).1
To test the efficacy of new commercially available fungicide products to reduce the effects of white mold in soybean and to determine which product has the best return on investment (ROI).
Trial location was selected based on previous years of inoculum incorporated into the soil, continuous soybean rotation, high soil fertility, and high potential for disease pressure. A soybean product with 2.2 maturity and susceptibility to white mold was planted in 30-inch rows at a high population (180,000 seeds/acre) with five replications. Weeds were uniformly controlled using a residual/postemergence control program. Fungicides were applied at the R1 growth stage (Table 1).
Table 1. Fungicide treatments.aLabeled suppression only.
Table 2. Return on investment when applying each fungicide product.
Figure 1. Effect of fungicide treatments on soybean yield at Mason, MI in 2017.
1 Wise, K. 2017. Fungicide efficacy for control of soybean foliar diseases. BP-161-W. Purdue Extension. 171212152425