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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.
2. Fungicide applications may be profitable when disease pressure is high. Cost of a fungicide application is approximately $26 to $28 per acre and with grain prices hovering around $3.25 per bushel; some may choose not to spray.