For the other varieties, spray when the disease first appears, and repeat every 7 days. Do not use treated area for grazing or feed plant parts to livestock. Rotate beans with nonlegume crops. Avoid poorly drained soils. Plow under previous crop residue rather than disking it.
Root rot is caused by a complex of soilborne fungi.
The primary fungus causing root rot in the mid-Atlantic region is Pythium. Pythium causes extensive damage in July and August during periods of warm, humid weather. Adjust application equipment so that granules are uniformly applied in the furrow at planting. Lima Bean Downy Mildew. Strains A, B, C, and D are all present in the mid-Atlantic region.