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Detailed Explanation of Control Measures for 3 Soybean Diseases

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Soybean root rot: This disease can occur and cause damage throughout the entire growth period of soybean, with yield reductions of 25%-75% or more. The protein content of affected seeds is significantly reduced. The main symptoms are dark brown lesions appearing at the base of the stem, spreading upward to varying degrees to the lower lateral branches, causing the pith of the diseased stem to turn brown, the base of the petiole to constrict, and the leaves to droop but not fall off. Chemical control mainly uses 58% ridomil manganese zinc or 72% curzate wettable powder, both applied as seed treatment at 0.3%-0.4% of seed weight. Soybean sclerotinia: Soybean sclerotinia

Soybean root rot: This disease can occur and cause damage throughout the entire growth period of soybean, with yield reductions of 25%-75% or more. The protein content of affected seeds is significantly reduced. The main symptoms are dark brown lesions appearing at the base of the stem, spreading upward to varying degrees to the lower lateral branches, causing the pith of the diseased stem to turn brown, the base of the petiole to constrict, and the leaves to droop but not fall off. Chemical control mainly uses 58% ridomil manganese zinc or 72% curzate wettable powder, both applied as seed treatment at 0.3%-0.4% of seed weight.

Soybean sclerotinia: Soybean sclerotinia mainly infects the stems, with onset beginning in late July. In the early stage of infection, brown lesions appear on the stems, and later white cottony mycelium and white granules form on the lesions, which then turn into black granules (sclerotia). When the diseased stem is cut lengthwise, black cylindrical sclerotia resembling mouse droppings can be seen, and the dead diseased plant turns grayish-white. For chemical control, spray with 50% sumilex wettable powder at 1000 times dilution, or 40% hexaconazole at 1000 times dilution, or 50% thiophanate-methyl at 500 times dilution.

Soybean frogeye leaf spot: Also known as spot disease, it generally begins to develop on leaves in early to mid-June, and enters the peak incidence period in mid-July. Pods become infected starting from the young pod stage, with the seed-filling stage being the peak period of incidence. In years with high temperature and frequent rain in July-August, the disease is severe. It mainly damages leaves. When severely affected, almost all leaves are covered with lesions, causing premature leaf drop, resulting in 20%-30% yield reduction and decreased quality. Chemical control: In addition to seed treatment at sowing with 70% fenaminosulf wettable powder or 50% thiram wettable powder at 0.3% of seed weight, during the flowering and podding stage of soybean, apply 1.5 kg of 40% carbendazim suspension concentrate per hectare, diluted in 450 kg of water for spraying.

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