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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.
Pay attention to weather forecasts prior to a fungicide application. Avoid spraying when rain is expected. A general rule is that systemic fungicides need a minimum of 3 hours on the plant surface before a rain. Contact fungicides are always sensitive to rain but more so prior to drying on plant surfaces.