Diseases of zucchini mainly include gray mold, powdery mildew, and virus diseases in greenhouse cultivation.
1. Botrytis cinerea: Botrytis cinerea is a major disease in the cultivation of zucchini in greenhouses in winter and autumn and winter and is extremely harmful. The main hazard is the young melon. The germs invade from the unsuccessful flower, grow a layer of gray mold, and invade the melon strip directly, causing the navel to become corrupted. The umbilical parts of the damaged melons turned yellow, softened, wilted and rot, and the diseased part had a gray mold layer. Stems and leaves can also be affected after contact with diseased melons. Large pieces of rot grow and have gray-green hairs. The symptoms of gray mold of squash gourd and cucurbits are similar in wet conditions and need to be detailed separately so as not to delay the timing of prevention and control.
Prevention: Covering with ridges, under-membrane irrigation, ventilation, and humidity, reduce air humidity. Strengthen field management to prevent overgrowth and leggy growth of plants and cultivate robust plants. When hormones are attached to flowering, we add scoxol for prevention. At the beginning of the disease, spray 1 kg per mu with 10% quick-king dust, or 1500 times with 50% quick-inking WP. Once every 7 days, spray 3-4 times.
Second, powdery mildew: disease from the seedling stage can be harvested. The main damage leaves, vines followed. In the early stage of disease, the leaf surface or the back of the leaf produces a white, round, white spot, and then develops into a contiguous white powder with indistinct edges. In severe cases, the whole leaf is covered with white powder, and the white powder becomes dark later in the disease.
Prevention and control: Scientific management, avoiding unevenness in dryness or dryness and humidity, cultivating robust plants, using 20% ​​triadimefon 2000 times solution, 50% thiophanate-methyl 600 times solution, or Nongken 120 fungicide 100ppm for foliar spray at the beginning of disease, It can also be smoked with chlorothalonil smoke or triadimefon.
3. Viral diseases: The disease can develop during the whole growth period of the summer squash, which mainly damages the leaves and fruits. After the leaves were damaged, they were systematically mosaiced or systematically mottled. The leaves of the seriously diseased plants were chicken claws with dark green spots. Fruit damage leads to malformed fruit, and the mask is bumpy and bumpy. Dwarf plants are short and have little or no results.
Prevention and control: such as promoting the use of protected cultivation, early sowing or planting, can effectively prevent the risk of virus disease; thoroughly eradicate the weeds in the field, avoid winter vegetables, timely control of aphids, to prevent worms pass the virus; seedling spraying 83 increase resistance 100 times liquid to improve seedling resistance to virus; spray 20% of virus A WP 500 times or 1.5% of phytoalexin emulsion 1000 times at the beginning of disease, once every 10 days, continuous Prevention 2-3 times.
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