This project seeks to quantify the impact of fungicide spray volume on white mold management in soybeans with the goal of minimizing application costs and maximizing the profitability of fungicides for management of white mold in soybeans. The use of fungicide spray volumes greater than 10 gal/ac is a widely recommended strategy for improving fungicide performance against white mold in soybeans. Research supporting that recommendation had been lacking, and recent findings suggest that increasing spray volume above 10 gal/ac may have little or no effect on white mold management. In research conducted in Brazil, increasing fungicide spray volume from 10.7 to 21.4 gal/ac had no impact on white mold management with either the fungicide Omega (registered in the U.S.) or the fungicide procymidone (not registered in the U.S.). In research conducted in North Dakota in 2020 and 2021, increasing fungicide spray volume from 10 to 25 gal/ac had no impact on white mold management or yield in pinto, black, dark-red kidney, light-red kidney, or navy beans. This project seeks to identify the minimum spray volume needed to optimize fungicide performance for white mold management in soybeans. Field studies will be established under irrigation in Carrington and Oakes, ND to assess white mold control, yield response, and profitability of applying fungicides at 5, 7.5, 10, 12.5, and 15 gal/ac. Testing will be conducted on varieties differing in architecture (upright versus bushy) with the widely utilized fungicide Endura (at 5.5 oz/ac) applied once versus twice sequentially.