Cucumber wilt disease occurs in the cucumber seedling stage to the fruiting stage. At the beginning of the disease, some leaves or one side of the leaf were wilting and drooping. Afterwards, the entire plant was withered. The main vine base was slightly contracted and split longitudinally. When the humidity was high, white or pink moldy material appeared on the surface; the root was rotted and easy to pull up. The onset of seedlings, the wilting of the cotyledons, the browning of the base of the stem, or the appearance of standing and falling, occurred.
Cucumber fusarium wilt is caused by the infection of the cucumber specialized fungus of Fusarium oxysporum. The pathogen spreads from the stem to the fruit through the catheter, causing the fruit to rot and the seeds to carry the bacteria. Sprouting the seeds of the bacteria can occur at the seedling stage. Contaminated seeds and diseased bodies are the primary sources of infestation. After the pruning or binding of vines causes wounds, the pathogens invade again and secondary infection occurs. After a long time of rain or when the rain is clear, continuous cropping, soil viscosity, low-lying terrain, poor drainage, easy to disease; seedlings aging, fertilization, partial nitrogen fertilizer, disease severity.
Control methods: (1) Select disease resistant varieties such as Zhongnong 5, Zhongnong 7, Zhongnong 8, Shannong 1, Shannong 2, Zaoqing 2, Jinchun 3, and Loudi 3. (2) Implement rotation. Choose sandy lands with high relief and well-drained land for cultivation, and implement non-melon vegetables for more than three years. (3) Chemical control. The seeds were soaked in hot water at 60°C for 10 minutes or seeded with 50% seed weight of 50% carbendazim. When sowing, 50% carbendazim WP or 70% thiophanate-methyl WP or 95% dextran-soluble powder 1.25 kg/mu, and soil 1:100 blended into the seedbed. Before transplanting, the same amount of 70% thiophanate-methyl and 50% thiram were mixed and 50 times finer soil was added to the drug soil or applied. The diseased plants were found to be removed in a timely manner, brought out of the field and deeply buried, and 20% lime milk or 40% Daisin ammonium water agent 400 times liquid was used to disinfect the soil at the diseased point and around to reduce the bacteria source. Slightly diseased cucumber field, with high temperature and high temperature in summer, with 50-100 kg of lime per acre, 500 kg of straw, 60 cm of soil, 30 cm to 35 cm in height, covered with ridges filled with water. Dunhuang 10 days. In the early stage of disease, 10% polymycin wettable powder 1000 times solution, Rezinc mixture 1400 times solution, and 50% carbendazim WP 500 times solution can be applied. Every 7 to 8 days, a total of 3 sprays are used. Times. Or in the morning when the dew is not dry, use 1 part of lime and 4 parts of plant ash to mix and spread; or use 40% anti-dry spirit, 70% thiophanate-methyl WP, 45% dexamethasone water 1000 times, Ninety-five percent of dexamethasone soluble powder 750 times liquid and 10% double effect water lingering agent were used to irrigate the roots. Each vessel was filled with 250-500 milliliters of urea and every other 7-10 days. The total irrigation was 2 or 3 times. Flowering fruit setting period, with 50% thiophanate WP or 50% carbendazim WP 500 grams, 60 kg of water to irrigate the roots, each irrigated 200 ml, once every 7 to 10 days, once, even irrigation 2 times.
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