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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. Fungicides are pesticides that kill or prevent the growth of fungi and their spores. They can be used to control fungi that damage plants, including rusts, mildews and blights. They might also be used to control mold and mildew in other settings. Fungicides work in a variety of ways, but most of them damage fungal cell membranes or interfere with energy production within fungal cells. Keep these tips in mind when using fungicides: 1  A fungal disease in plants can be misdiagnosed easily. Check with your local county extension office for help identifying plant disease. 2  Often, plant diseases are transmitted when leaves are wet. Ground level watering and good air circulation can be used to keep leaves dry.