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Detailed Explanation of Control Methods for Two Major Soybean Diseases

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Soybean frogeye leaf spot, also known as spot disease, begins infecting pods from the young pod stage, with the seed-filling stage being the peak period of infection, and severe outbreaks occur in July to August when high temperatures and frequent rain occur. It mainly damages leaves; when severely affected, almost all leaves become covered with lesions, causing premature leaf drop, reducing soybean quality and cutting yields by 20%-30%. This year, the hot and rainy climate in many parts of our province is highly favorable for the disease to occur, and the author reminds soybean farmers that they must not neglect the control of soybean frogeye leaf spot. Chemical control: During the flowering and podding stage of soybean, use 50% carbendazim

Soybean frogeye leaf spot, also known as spot disease, begins infecting pods from the young pod stage, with the seed-filling stage being the peak period of infection, and severe outbreaks occur in July to August when high temperatures and frequent rain occur. It mainly damages leaves; when severely affected, almost all leaves become covered with lesions, causing premature leaf drop, reducing soybean quality and cutting yields by 20%-30%. This year, the hot and rainy climate in many parts of our province is highly favorable for the disease to occur, and the author reminds soybean farmers that they must not neglect the control of soybean frogeye leaf spot.

Chemical control: During the flowering and podding stage of soybean, use 50% carbendazim or Shikeke at 800-1000 times dilution per mu for spray control, or use 20 g of 5% hexaconazole suspension concentrate mixed with 30 kg of water, or use 20 g of Baozhida (18% prochloraz + copper abietate emulsifiable concentrate) mixed with 30 kg of water for spray control.

Soybean sclerotinia stem rot: This disease mainly infects the stems, with infection beginning in late July. In the early stage of infection, brown lesions appear on the stems, after which white cottony mycelium and white granules appear on the lesions, and finally they turn into black granules. When the diseased plant stems are cut lengthwise, black cylindrical sclerotia resembling mouse droppings can be seen, and the dead diseased plants appear grayish-white.

Chemical control: Spray with 50% procymidone wettable powder at 1000 times dilution, or 40% Junhejing at 1000 times dilution, or 50% thiophanate-methyl at 500 times dilution.

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