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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.
Fungicides are for prevention only and will not kill existing fungi on the plant. Spraying is required at the beginning of the season, before budding, with regular application every 7 to 10 days--7 days if there is rain and 10 if the conditions are dry. Keywords: white plant fungus, powdery mildew, garden fungus.