Each growth period can occur, mainly affecting the roots and base of stems. The site of infestation begins to produce water-soaked reddish-brown spots. After a few days, it becomes dark brown or dark brown, slightly sunken, the leaves turn yellow, and develop from bottom to top. But the leaves do not fall off. The main root is rotted or necrotic, with fewer lateral roots.
Control methods:
1 Implement crop rotation, use disease-free soil to nurse seedlings or bed soil disinfection; increase application of bio-organic fertilizer and phosphorus and potassium fertilizer, reduce and prevent single use of nitrogen fertilizer; at the same time, deep plowing, increase soil permeability.
2 In the early stage of disease, the following agents can be used to prevent and control: carbendazim, hymexazol, or metalaxyl irrigating roots, filling once every 10 days, and even irrigating twice.
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