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Control methods: 1 adjust shade, increase lighting and pay attention to drainage; 2 at the beginning of the disease, use Qingfengxin 80 units or 70% thiophanate-methyl 1500 times, spray once every 7 to 10 days, and even spray 2~ 3 times; 3 selection of disease-resistant varieties, increased phosphorus, potassium fertilizer, improve plant resistance to disease; 4 implement rotation.
2. Anthrax disease. At the beginning of May, there were oily spots on the leaves, which gradually expanded into lesions with purple-brown edges and grey in the middle. The center of the lesion was perforated at the later stage and a purple-brown lesion appeared on the petiole. In severe cases, the entire plant died.
Control methods: 1 winter garden, concentrated diseased leaves burned; 2 with 1:1:100 to 150 Bordeaux mixture or 80% mancozeb WP 800 to 1000 times spray, spray every 7 to 10 days 1 times, even spray several times; 3 disease leaves removed immediately after the onset, spray 50% carbendazim 800 ~ 1000 times or 60% anthrax Fumei 400 ~ 600 times liquid, spray 7 days, once even spray 2 ~ 3 times .
3. White plague. It often happens in summer and autumn. The bacteria first invaded the rhizomes, white mycelium and rapeseed-like sclerotia appeared at the rhizomes, and then the leaves were purple-brown or orange-yellow, and the whole plant died in severe cases.
Control methods: 1 The diseased plants were immediately removed and burned, and the diseased points were treated with lime powder, or watered with 50% carbendazim WP 800 times; 2 were sprayed with 50% TBV 500 times, 7 days after spraying. One time, continuous spray 2 or 3 times; 3 and corn rotation for more than 5 years.
Coptis disease prevention and treatment
1. Powdery mildew. In late May, the disease was severe in July-August. At the beginning of the disease, round or oval yellow-brown spots appear on the back of the leaf and gradually expand into lesions. The surface of the leaf is spotted brown, grows white powder, and spreads from the old leaf to the new leaf. The white powder gradually covered the leaves of the whole plant, causing the leaves to die slowly and in serious cases the whole plant died.