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âWhen you get soybeans up 36 in. or taller at a seeding rate of 120,000-140,000 seeds/acre and you get August rains and humidity that follows, those soybean plants are highly susceptible to disease. Under those conditions is when I think fungicides really help on soybeans,â Moore says.
Apply a fungicide. Once infected, the application of sulfur dust may help prevent the spread of blight to other leaves or plants. Regular fungicide application 2 to 4 weeks after transplanting the tomatoes into the garden will help prevent blight development.