dahliae Rhizoctonia root rot, Rhizoctonia (teleomorph solanum Thanatephorus cucumeris) Black root rot, Thielaviopsis basicola Powdery mildews: These wind/rain transmitted fungal Use resistant cultivars. No treatment threshold found. beans, infections are characterized by a Sanitation: remove and destroy all crop Fungicides may not be economical Erysiphe communis soybean, gray-white powdery film, residues. and not recommended. E. communis f. sp. spots on the leaves and Use crop rotation. glycine stems, which become dry and brittle. The leaves will then turn yellow, die and drop off. Infected plants have lower yield and a shortened fruiting season. High relative humidity and warm, shady weather favors disease development. Downy mildew is a disease of Use early harvest to reduce losses. No treatment threshold found. Downy Mildews: Peas, foliage, caused by an Oomycete Usually clears up in warmer and dryer weather Fungicides may not be economical Peronospora pisi Soybean, (fungus-like) organism. It is following a cool wet spring. and not recommended. Peronospora spread from plant to plant by manshurica airborne spores. Infection is favored by heavy dew and rainfall, leading to prolonged leaf wetness. Rusts: These diseases appear as minute Resistance is available for this disease although No treatment threshold found. peas, rust-colored flecks on both sides there are many races of the fungus and few Uromyces pisi, Uromyces of the leaf. As the number of varieties are resistant to most or all races. mancozeb fabae soya, infections increase and leaves Planting should be done during the correct azoxystrobin Uromyces sojae bean, become older, they develop a planting period. Uromyces phaseoli color. Disease emergence Rotate away from any bean for two years. and spread are favored by warm Control weeds and maintain good air temperatures and nighttime circulation. condensation on the leaves. Sanitation: Plow debris under right after
dahliae Rhizoctonia root rot, Rhizoctonia solanum (teleomorph Thanatephorus cucumeris) Black root rot, Thielaviopsis basicola Powdery mildews: beans, Erysiphe communis soybean, E. communis f. sp. glycine These wind/rain transmitted fungal infections are characterized by a gray-white powdery film, spots on the leaves and stems, which become dry and brittle. The leaves will then turn yellow, die and drop off. Infected plants have lower yield and a shortened fruiting season. High relative humidity and warm, shady weather favors disease development. Use resistant cultivars. Sanitation: remove and destroy all crop residues. Use crop rotation. No treatment threshold found. Fungicides may not be economical and not recommended. Downy Mildews: Peas, Peronospora pisi Soybean, Peronospora manshurica Downy mildew is a disease of foliage, caused by an Oomycete (fungus-like) organism. It is spread from plant to plant by airborne spores. Infection is favored by heavy dew and rainfall, leading to prolonged leaf wetness. Use early harvest to reduce losses. Usually clears up in warmer and dryer weather following a cool wet spring. No treatment threshold found. Fungicides may not be economical and not recommended. Rusts: peas, Uromyces pisi, Uromyces fabae soya, Uromyces sojae bean, Uromyces phaseoli These diseases appear as minute rust-colored flecks on both sides of the leaf. As the number of infections increase and leaves become older, they develop a color. Disease emergence and spread are favored by warm temperatures and nighttime condensation on the leaves. Resistance is available for this disease although there are many races of the fungus and few varieties are resistant to most or all races. Planting should be done during the correct planting period. Rotate away from any bean for two years. Control weeds and maintain good air circulation. Sanitation: Plow debris under right after No treatment threshold found. mancozeb azoxystrobin