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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.
Fungicide packaging will carry specific instructions, but, in general, spraying after rain should take place no sooner than seven days after the preceding treatment. If trees have been sprayed with an oil-based spray, sulfur sprays should not follow, even if it rains, for at least three weeks.