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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.
The way it kills the fungus is termed the fungicide's 'mode of action.' Certain fungicides, usually systemics, have very specific modes of action and are said to be 'at risk' to the development of resistance. An 'at risk' fungicide may bind to a very specific chemical within the fungus or disrupt one specific step required for the reaction.