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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.
I would suggest that a recently applied protectant fungicide should be re-applied if more than two inches or rain fell or after 1 inch of rain if the residue is seven days old or older. A little bit of rain is not all bad, as it can help to distribute the fungicide residue over the plant surface.