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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 and How to Use Them Effectively. Viruses, nematodes, and bacteria can cause plant disease, but fungi are the number one disease-causing organism. As a result, fungicides are frequently used by homeowners when managing plant disease problems. Fungicides are pesticides that can kill or inhibit growth of fungi on plants, but they are not effective against bacteria, nematodes, or viral diseases. Fungicides can be classified based on if they are absorbed by the plant and if they can move around in plant tissues, their 'curative' properties, how they kill the fungi (mode of action), and type of chemical.