Control technology of cucumber root knot nematode
With the expansion of vegetable cultivation area in protected areas, affected by factors such as high temperature, high humidity, closure and flail cultivation, cucumber root knot nematode disease has increased year by year and has risen to become an important disease in cucumber production, generally reducing yield by 20%. 30%, the heavy ones are more than 50%, and even the production. Cucumber root knot nematode disease mainly affects the roots of the plants. After the roots are damaged, the plants are poorly developed, the lateral roots are increased, and spherical or conical shaped tumors of different sizes are formed at the root end, sometimes stringed. The nodules are initially white, soft in texture, then turned brown or dark brown, and sometimes cracked on the surface. The root knot was dissected, and the diseased tissue showed a small milky white nematode. The root knot can generally grow a weak new root, causing the host to re-infect the disease and form a root knot. The symptoms of the upper part of the ground are different due to the severity of the disease. The symptoms of the mild disease are not obvious, the severe diseased plants are poorly developed, the plants are short, yellow, wilting, affecting the melons, and the melons are mostly deformed. The plant died. Comprehensive control measures Cucumber root knot nematode disease should adopt comprehensive technical measures, mainly based on agricultural control, and strengthen scientific drug guidance, prohibit the use of high-residue pesticides such as Shennongdan on vegetables, minimize the number of medications, and research and promote ecological control. Measures to use a large number of biological pesticide preparations, aiming at the short growth period of cucumbers and the characteristics of directly edible melons. Selecting biopharmaceuticals such as avermectins with high efficiency, low toxicity, low residue, no pollution and short safety interval. Reduces residue and improves control. I. Agricultural control measures 1. Soil seedlings using wireless insects, cultivating disease-free seedlings, and preventing planting of diseased seedlings are important measures to prevent nematodes. 2, deep turn the soil: In view of the characteristics of the activities of the nematodes distributed in 5-10cm, taking more than 25cm of deep soil layer to turn most of the nematodes into the deep layer, can effectively reduce the damage. 3. Eliminate the diseased body, completely remove the diseased body before harvesting, and dig all the roots buried in the soil layer, bury it deeply or burn it. It is forbidden to use this manure, which is an effective way to reduce the disease. 4. In the case of a serious field in the root-knot nematode, the two-year or five-year rotation with the sarcophagus can be achieved, and the desired effect can be obtained. In addition, celery, cucumber, and tomato are high-sensitivity vegetables, and green onions, leeks, and peppers are resistant to disease-resistant vegetables. Planting disease-resistant vegetables in diseased fields can reduce losses, reduce the amount of nematodes in the soil, and reduce the damage of the lower jaw. 5. Flooding method: It can prevent the infection, reproduction and growth of root-knot nematode disease by filling the soil surface for 10cm or more in a few months. 6, hot water disinfection method. Turn the soil deeper by 60cm to keep it loose and flat. The heat-resistant drip irrigation pipe is laid on the ground, and a layer of film insulation is covered on the soil surface and the dropper. After heating the oil of the oil-fired boiler to above 90 °C, it is poured into the soil through a heat-resistant plastic hose with a diameter of 5 cm for treatment. The amount of water per square meter is 50L. It can achieve the effect of killing root-knot nematodes and soil pathogens. Second, biological control measures Before colonization, 1.5 billion / g of Afro Streptomycin and its active material GR, with 2-3kg per acre of application effect. Third, chemical control measures 1. Pharmaceutical treatment of soil, using 10% thiazolidine granules 2kg or 5% thiocarbamate granules 3kg or 10% Yishufeng granules 1.67kg or 0.5% avermectin granules per acre before cucumber planting. 3~4kg of treated soil. 2, hole irrigation, with 40% phoxim EC 2L plus 1.8% avermectin EC 200g mixed hole irrigation, or 1% Wackerda 40% phoxim EC 1kg hole irrigation. Re-injection once every 15 days after planting, 250ml of liquid per well can effectively inhibit the number of root-knot nematodes and inhibit root-knot production. 3, the use of calcium cyanamide to control root knot nematodes, the use of calcium cyanamide for high temperature and high humidity shack, can effectively prevent root knot nematode disease. 1 In the season with the highest temperature in the three months of June, July and August, the soil in the greenhouse was first turned loose, ridged, and the ridge height was 15cm to facilitate irrigation and increase the ground temperature. 2 Use 1300kg of crushed straw or wheat straw (length 1~3cm) and 70kg of calcium cyanamide per acre, evenly spread on the soil, then plow the soil and mix the straw and bed soil thoroughly. 3 Drain the water into the soil until it is saturated. 4 After filling the greenhouse, cover the whole plastic soil with a complete plastic film, and cover it with a tight cover to improve the ground temperature to ensure the disinfection effect. 5 sealed greenhouse for 1 month to ensure that the shed temperature reaches 60 °C. 6 After the shack is over, open the shed according to the soil moisture, adjust the soil moisture, and then cultivate the cucumber. 4. Using root line é…Š100ml to add 150kg of water to the gibberellin 125ml produced by Shanghai 18th Plant, 300 strains, and 10 days later, the root line ä¸ without gibberellin is irrigated. If there is wilting after pouring, the water will be poured. Can be alleviated. Help Sleeping Plant Extract,Taraxacum Platycarpum Extract,Polygala Tenuifolia Extract,Gynostemma Pentaphyllum Extract Fufeng Sinuote Biotechnology Co.,Ltd. , https://www.sntextract.com
