With the expansion of the planting area of ​​vegetables in protected areas and the influence of high temperature, high humidity, closure, and continuous cropping, vegetable root-knot nematode disease has been increasing year by year, and has risen as an important disease in vegetable production. Generally, production is reduced by 20%. 30%, more than 50% of the weight, or even no income. First, the symptoms of damage Vegetable root-knot nematodes mainly damage the roots of plants, root damage, poor plant development, increased lateral roots, and in the root to form a spherical or conical size of tumor-like objects, and sometimes string. The nodule was white at first and its texture was soft. It turned brown to dark brown and cracked on the surface. Roots were dissected and the diseased tissue was presented as a small milky white nematode. A weak new root can grow on the root knot, causing the host to become infected again and form a root knot. The symptoms of the above-ground surface symptoms are different due to the severity of the disease. The symptoms of the mildly ill strains are not obvious. The severe diseased plants are stunted, the plants are short, yellowing, wilting, affecting the melons, and the melon strips are often deformed. When the onset is severe, the whole plant will die. . II. Comprehensive prevention and control measures Vegetable root-knot nematode disease should adopt comprehensive prevention and control measures, mainly agricultural control, prohibit the use of high-residue pesticides on vegetables, minimize the frequency of drug use, research and promote ecological control measures, and make extensive use of biological pesticide formulations. 1. Use of soil-free seedlings The use of worm-bearing soil seedlings or treatment of soil with pre-planting agents to cultivate disease-free seedlings and prevent the establishment of diseased seedlings is an important measure for the prevention and control of nematode disease. 2. Deep-sweeping soil Considering the characteristics that nematodes are distributed in the 5-10 cm soil layer, adopting deep-turning soil layers of more than 25 cm will turn most nematodes to deep layers, which can effectively reduce the disease. 3. Remove the diseased body and completely remove the diseased body before harvesting. All the fibrous roots buried in the soil layer should be excavated, buried or burned. It is prohibited to use for fattening fertilizer, which is an effective way to reduce the disease. 4. Chemical control before planting with 10% Yishufeng 1.0-1.5 kilograms per acre Kai Kai points, or with 1.8% worms or 6.73% Awei insect clear 1-105 ml per square meter Water 6 kg, when the soil is disinfected or when the vegetables are planted, dilute 5000-6000 times per acre with furrows or holes, and then seal the ridges. After 1 month, irrigate 1-2 times, and the control effect is about 90%. The validity period is up to 20 days and its control efficiency is excellent.
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