1. Symptom recognition mainly occurs in the adult stage, and it can be caused by various parts of the ground. However, the most common is the damage of stem vines and melons. The incidence of stem vines, mostly in the near-ground 20-30 cm, especially in the first few flowers of the disease. The appearance of blister-like brown spots at the beginning of the disease quickly expands upwards and downwards to expand the disease area, some up to 10-20 cm. The diseased department had a layer of white mycelium, accompanied by the occurrence of water droplets, and the tissue of the stem was rotted, forming a small amount of black sclerotia on the surface of the diseased stem and the pith. The incidence of melon strips, mostly by the first appearance of residual flowers, the beginning of dark water immersed rot, spread up until the melon tip until the entire melon strip. Guatemala disease is brown, with water rot, and the surface is covered with cotton flocculent white hyphae. After 3-5 days, black sclerotia grow in the mycelium layer. Sclerotia vary in size, shape, and most of the sclerotia are murine-like. There are more than a dozen sclerotia on a diseased melon and more than a hundred. When the Guatemala Disease Department expanded to more than half of the melon strips, the diseased melons mostly fell to the ground, and a few of the hanging stems lost water as a result. 2. The pathogen Sclerotiniasclerotiorunm (Lib.) deBary called a nuclear plate, belonging to the phylum Ascomycota. The sclerotia of the sclerotia produced by the disease department is not very different. The sclerotia germinates to produce tall goblet-like ascospore disks. A sclerotia usually produces 1-5 ascospore disks, with more than 20-30 cultivars. The majority of the diameter of the apical capsule is 5-7 mm, light orange, with dense ascospores, rods asculate, and color, with 8 ascospores. In addition to infesting melons, germs can also infect tomatoes, eggplants, peppers, lettuce, cabbage, and other vegetables. 3. The pathogenic bacteria in the sclerotia are left in the soil, or mixed in the winter between the seeds. The sclerotia mixed in the species were planted into the field. In the following spring, the sclerotia of the wintering sclerotium germinates to produce an ascopore disk, exposing the soil surface and ejecting ascospore spores, which floats and moves in the air. When the cucumber is exposed to the wound, it will invade from the wound or melon stripe and cause disease. After the onset of off-flowering disease, the melon strips off, falls on the plant stems and leaves, and can also cause stem vines and leaves. 4. Prevention and control measures (1) Agricultural control After the harvest, the fields are completely removed, and the land is deep-falled. Conditional protection sites, after harvesting in the upper leaves, can be filled with water for about 1 month to kill most sclerotia in the soil. The mulching method was used to cover the sorghum cultivation, blocking the release of ascospores. During the excavation period of the sub-capsule plate, diligently cultivator, loosen the soil and remove the sub-cultivation plates. Close the greenhouse in the morning to raise temperature, and ventilate in the afternoon to release moisture, creating conditions of temperature and humidity that are not conducive to germination and infection. (2) The prevention and treatment of drug use in the early stage of chemical prevention. Can use 50% carbendazim WP 500 times, or 70% thiophanate-methyl wettable powder 1000 times, or 50% acetaminophen wettable powder 1000-1500 times, or 65% trimethoprim Wet powder 1500 times, or 40% sclerotium net wettable powder 1000 times, or 50% mixed sulfur suspension 500 times. Can also be used 5% chlorothalonil dust, 1 kg spray per 667 square meters, or 50% quick-inking wettable powder 50-100 times spread stem disease. Disclaimer: Some articles in this website have been transferred from the Internet. If you are involved in third party legal rights, please inform this website. phone Sun Shade Netting,Shade Netting For Vegetables,Green Sun Shade Net,Green Net For Sun Protection Changzhou Satidi Import and Export Co., Ltd. , https://www.czguanjiechuck.com