Netted muskmelon is a muskmelon series suitable for growing in air-dry, sunny, high summer temperatures and large temperature differences between day and night. In addition to the northwest region of China, most parts of the country are rainy, have high humidity, and have a small temperature difference between day and night, which is not conducive to the growth of Netted melons. At present, cultivation is mainly based on the form of protected land and artificially controlled environmental conditions. However, with the expansion of cultivated areas and the increase of multiple cropping index, the area where root knot nematode diseases occur is expanding and the damage is becoming increasingly serious. At present, alluvial melons occur in greenhouses in various parts of Henan Province, and the yield is generally reduced by 10% to 30%. Severe plants are dwarfed and even die. First, symptoms and pathogens. Surveys have shown that the root-knot nematodes of Methina melon have southern root-knot nematodes, peanut root-knot nematodes, northern root-knot nematodes, and so on. In southern Henan, the southern root-knot nematodes are the main ones, and the damage is heavier. The root-knot nematode mainly infects the root of melon, and the affected lateral roots produce nodular root knots. The roots of the infected roots increase, and serious bead-like tumors resemble the size of mung bean on the lateral roots. The white surface is smooth, and the root becomes brown later, and the whole root is rough and rough. , irregular. Symptoms of above-ground performance are different depending on the severity of the disease. Mild diseased plants have no obvious symptoms. Serious diseased plants have poor growth. Leaves wilt or gradually wilt at noon. Plants are dwarf and affect fruitfulness. When severe disease occurs, plants wither and die. Second, the route of transmission. Meloidogyne incognita survives in the 5-30cm soil layer. Eggs or second-instar larvae often remain in the soil as the disease remains in the soil. Diseased soil, diseased seedlings, and irrigation water are the main routes of transmission. Generally, it can survive for 1-3 years. When the spring conditions are appropriate in the second year, females buried in the roots of the host produce single-celled eggs. The first-instar larvae are formed after the eggs are laid for several hours, and then hatched after molting. The second-instar larvae, the second-instar larvae that have left the egg masses, move in the soil to search for roots that invade from above the root crown and colonize the growth vertebra. Their secretions stimulate the expansion of the duct cells, causing them to form giant cells or worms, which are called root knots. . During the growing season, several generations of the root-knot nematode logarithmically increase, and when the fourth-instar larvae develop, the ovipositor lays eggs. The eggs hatch and develop in the root knots. After the second age, they leave the egg mass and enter the soil and invade or overwinter again. The survival temperature of Meloidogyne incognita is 20-30°C. It is rarely active above 40°C or below 5°C. The lethal temperature is 10 minutes at 55°C. Third, the scope of the host. Reticulated melon nematodes have a wide host range, and melons, solanaceae and other protected areas can grow vegetables. Fourth, the incidence of conditions 1, nematode aerobic, sandy soil structure is loose, good air permeability, suitable for nematode disease is heavy; on the contrary, wet sticky and compact soil, is not conducive to nematode activity, the incidence is light. 2. The incidence of Melon melons in greenhouses was positively correlated with temperature. After the planting of autumn alfalfa, the temperatures were high, the onset was early and rapid, and the temperature was low in spring and late and slow. 3. As the nematode bacterium spreads from the soil, the incidence of continuous disease is heavy, and the longer the time, the more serious the disease. Former pods for eggplant, melons, celery, lettuce and other diseases. V. Comprehensive prevention and control measures. According to the characteristics of the disease and the incidence of muskmelon disease, the following comprehensive prevention and control measures should be taken: 1. Do not raise seedlings in the sick shed to avoid using unripe fertilizer. 2. Rotation of crop rotation can significantly reduce the number of nematodes in soil. It is an easy preventive measure and should avoid long-term cultivation of the same crop in the same shed. 3, high temperature sterilization in the summer stuffy shed. Plowing once every 2 weeks in the hot summer to expose deep soil can kill nematodes. 4, chemical control. (1) Muskmelon although it has been infected by nematodes during the seedling stage, it is generally not in the seedling stage. At this time, avermectin insecticide can be used on the seedbed, and the regular root irrigation and soil treatment have obvious control effect. . According to the test, 1.8% avermectin EC 1ml/m2 soil treatment can play a good control effect. (2) About 2 weeks before planting, deeply pour the soil and apply methyl bromide into the ditch and cover the soil. The dosage is 60-80g/m2, the control effect is better, or 3% Milur granules, the dosage is 3-5kg/667m2. Can also be used 10% grams of phosphorus phosphate granules 1-1.5kg, applied to the soil before planting ditch, and then transplanted seedlings, the effect is better. (3) The diseased plants were found after planting, and the soil was treated with 1000 times Avermicide to irrigate the soil. The interval was 10-15 days and the control effect was better.
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