1 Symptoms 1.1 Anthracnose attacks leaves, vines, and fruits. On different hosts, there are different symptoms. After the vines and the petioles were damaged, they were initially yellowish-brown stains that were nearly round, and turned black after being slightly sunken. The lesions are dark on the leaves and there are purple halos. On the fruit, it was initially a roundish, pale green, water-stained spot. It expanded to a dark brown to purple color with a slight sag. The later-stage branch often healed into an irregularly shaped, large spot and cracked. In severe cases, the three melons can be deformed. High temperature and humidity are conducive to the occurrence of the disease. 1.2 Wilt disease destroys vascular bundles, causing seedling lodging and wilting of adult plants. It is a devastating disease that causes melons to fight melons. The conidiophores were clustered on conidiophores, revealing the surface of the host, pale pink dots. After the victimization, the base of the roots and stems became brown, water stains decayed, and pink mold was present. Melon vines are wilting from the bottom and melons are typical wilts. The pathogens use mycelium, chlamydospore, and sclerotia to survive in the soil and survive in the soil for 10 to 15 years. When the damage is severe, the seedlings die and rotten. 2 Control measures 2.1 Agricultural control 2.1.1 Select good varieties, such as New Seed Melon No. 1 and No. 2. Strengthen the cultivation and management, adhere to the purification and rejuvenation, maintain and cool to improve its excellent species. 2.1.2 Properly densely planted to facilitate ventilation. Arrange the layout of cornices and varieties reasonably, adjust the sowing date, avoid the period when germs spread and harm, reduce the incidence factors, and reduce the occurrence and spread of pandemic diseases. 2.1.3 Rotation and crop rotation should be carried out for three years and the above crop rotation should be carried out for three years without planting or planting. It is best to rotate with wheat, corn and other places. The rotation of the crops can improve the conditions for the propagation of pathogens. 2.1.4 Strengthen field management Rational fertilization and irrigation, improve growth conditions, and increase resistance. 2.2 Physical control 2.2.1 Autumn tillage, or deep-frozen, suitable for deep-frozen, sun or frozen alfalfa, can bury pathogens on the ground in deep soil and accelerate death; can change the soil environment in which bacteria live, kill directly or indirectly. Bacteria can effectively prevent the occurrence of anthrax and blight. 2.2.2 Soybean seeds and hot water soaking can kill the surface of the seeds and germs lurking inside the seeds. In the sun, the selected seeds are spread on the tarpaulin to fully expose the sun and diligently turn, which can play a bactericidal effect, and can also increase the seed germination rate. Hot water, hot seeds, put the seeds in 50 ~ 60 °C hot water in the hot 5 to 10 minutes, remove the air to be broadcast. 2.3 Control of pesticides 2.3.1 Seed treatment The seeds are sterilized with carbendazim or thiophanate-methyl wettable powder one day before sowing, and 0.3-0.5% of the weight of the vaccinator is used. 2.3.2 Datian Chemicals for the prevention and treatment of anthrax 50% thiophanate-methyl WP 500 to 700 times or 58% metalaxyl MnZn WP 500 to 600 times; foliar spray, 7 to 10 days to spray 1 Times, spray a total of 3 to 4 times. In the initial stage of wilt disease, 70% of Dixon 800 times solution or 70% of Mancozeb 500 times solution was used to perfuse the roots in the affected strains and surrounding melons. Irrigation was performed 7 to 10 days and irrigation was performed 3 to 4 times. Can effectively control the spread of the disease.
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