Water chestnut is an annual aquatic herb. The meat contains various nutrients such as starch, protein and fat, and has certain nutritional and health effects. Due to water pollution, temperature and humidity, etc., during the growth and development process, Lingyi suffers from various pests and diseases. The following is a detailed introduction to the main types of P. sinensis pests and their prevention methods, for your reference.
1, the main disease
The diseases of the water chestnut are mainly Sclerotium complanatum and Cercospora spp., which are generally spread by water flow, excision, etc., and are prone to occur when exposed to high temperature and high humidity. Rhododendron chinense is mainly harmful to leaves. In severe cases, the diamond rot will cause loss; brown spot disease occurs in various places, causing the leaves to fall early, resulting in reduced results and reduced fruit.
2, the main pests
The pests mainly include Galerucella birmanica Jacoby, Macrosteles purpurata, and the like. The larvae of the horns can be eaten by the leaves, and the larvae can cause damage to the leaves. 1 a can occur in 6 to 7 generations, of which 6 to 7 months are the largest, and the damage is heavier. The rhododendron sinensis is a nymph, and the nymph attracts the water chestnut, stem, and leaf. It can occur for 6 generations in 1 year, and the most serious damage is from July to August.
3. Prevention and treatment methods
The damage of the water chestnut pests is concentrated in June to September, and this happens to be the prosperous period of the flowering of the water chestnut. Therefore, the prevention and control of this stage is the key to the high yield and quality of the water chestnut. Lingtang should be kept flowing all the year round to ensure clean water, clear weeds, rotten leaves and old diamonds on the shore. Generally, after planting for 1~2 years, the fish and crabs should be rotated or changed to reduce the occurrence of pests and diseases. Since the rhododendron and the scutellaria often occur at the same time, it can be treated with insecticidal bismuth and deltamethrin, and the control is the peak.
1 The main disease types of the water chestnut and its prevention and treatment methods a. White plague. In the early stage of the disease, a small amount of yellow small lesions appeared in the middle of the leaves, and then gradually increased to the rot of the diamond disk. For agricultural control, rotation, weed removal and diamond slag residue are used. For chemical control, 50% keering WP 10,000 times solution and 70% thiophanate WP 8.0 can be used.
b. Brown spot disease. In the early stage of the disease, small brown spots appear on the edge of the leaves, and then expand into dark brown round or irregular large plaques with black mildew spots. Agricultural control should be reasonably densely planted, arranged in the diamond plate, to prevent overcrowding, etc.; chemical control can use 75% chlorothalonil WP 800 times solution, 70% methyl thiophanate WP 800 times solution.
2 The main pest species of the water chestnut and its control method a. Water chestnut. Adults and larvae feed on the leaves, causing holes and heavy flesh. Agricultural control should be carried out in rotation, timely treatment of diamond in the autumn, eradication of white wreckage and weeds in the pond; chemical control can use 18% insecticidal double agent 500 times solution, 1.8% avermectin EC 2 000 times solution, Polyester emulsifiable concentrate 2 000 ~ 2 500 times liquid; Lingtang seedling powder before planting, can also stock frogs.
b. Water chestnut purple leafhopper. The stem and leaf juice of the thorn sucking are harmful, resulting in a reduction in production. Agricultural control should be carried out in rotation, timely treatment of diamond in the autumn, eradication of weeds on the shore, etc.; chemical control can use 90% trichlorfon crystals 1000 times liquid, 40% dimethoate 1500 times liquid, 20% insecticide 500 Double liquid, 2.5% enemy kill 2 500 ~ 3 000 times liquid.
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