Sclerotinia sclerotiorum is harmful to the ground, seedling stage and adult plants can be affected. The flowering period suffers heavy damage and produces seedling withering, leaf rot, stem rot and rot rot. The stem base of the diseased seedlings was browned and water stained. When the humidity was high, cottony white hyphae grew. Afterwards, the diseased part dried and shrank with yellowish brown and died, and the epidermis was lacerated. Leaf disease began in the lower part of the plant. The primary leaf surface was dark green and immersed in spots. Afterwards, it expanded into a circular to irregular shape. The center of the lesion was grayish-brown, surrounded by dark brown, with yellow halos outside, and when the humidity was high, it was also white. Mycelium, leaves rotted off. The culm infected mostly from the middle part of the main stem, the diseased part was flooded, and then faded into a light brown to nearly white. The shape of the lesion was irregular and often expanded upwards and downwards around the stem, causing the diseased part to die or die. . When the humidity is high, black sclerotia are formed at the mycelium. The pith marrow became empty and the sclerotia was stuffed. Under dry conditions, longitudinal bark tear, vascular bundles exposed like messy, serious whole plant withered, particles are not received. Soybean meal infection is now immersed in irregular spots, and sclerotia that are slightly smaller than the sclerotia in the stem can be formed inside or outside the bowl.
Recommendation: Reduce the amount of soybean fertilizer, and add soybean root-preserving bacteria to the base fertilizer to ensure that the soybean is strong. Reasonably control the sowing density of soybeans, select cultivars resistant to sclerotinia, and spray the sclerotium net, Nongliling and other agents at the initial flowering stage of soybeans, and spray once after 7 days.
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