(B) The onset of the disease The pathogens used mycelia, oospores, etc. to overwinter in the soil or manure along with the diseased body, becoming the initial infestation source in the coming year. When the conditions are suitable, the pathogenic bacteria that come into contact with the host will form the initial infection, and the disease will be caused after 25 days at 25°C. The zoospores formed in the diseased zoosporangium germinate and then spread through wind, rain, and water to form repeated infections. Bacteria 9 ~ 37 °C can grow, the optimum temperature 28 ~ 30 °C. In a suitable temperature range, the humidity is the determinant of the occurrence of the disease. Drying is not conducive to the growth and development of pathogens. Even in rainy weather, the air has high humidity and serious diseases. Too much watering, heavy soil quality, is not conducive to the development of the root system, reduced resistance to disease, heavy disease. The application of organic fertilizers that are not decomposed and mixed with diseased bodies is heavy. Repeatedly repeated cropping, the accumulation of a large number of strains of bacteria in the soil is heavy. With the advent of the rainy season, with heavy rainfall and years of rainy weather, the incidence of cucumber in the open season has spread quickly.
(three) control methods
1. Implement two-year rotation crops with non-melon vegetables or rice, wheat and other bulk crops. Use seedless soil for seedlings.
2. Seed disinfection. Soaking seeds with 100% solution of 40% formaldehyde for 30 minutes, washing after sowing, or dressing with 25% metalaxyl wettable powder with a seed weight of 0.3%.
3. Pesticides are used to sterilize the soil prior to planting serious disease plots. Seedbed can be used 25% metalaxyl WP 8g and the amount of soil mix in the seedbed. Daejeon (plastic greenhouse for transplanting) can be spread with copper sulfate (3~5kg/mu) in proper amount and evenly spread in planting ditch or planting hole. Black seed pumpkin can also be used as rootstock for graft control.
4. Strengthen field management, avoid partial nitrogen fertilizers, increase phosphorus and potash fertilizers, and apply decomposed organic fertilizers. Sinking around the seedbed. Seedbed bed surface smooth, avoid stagnant water after irrigation. Sorghum planting, proper control of water after planting, avoid flood irrigation. Drain the water immediately after the rain to prevent the accumulation of water in the field. After the illness, delay watering and water before rain. The central diseased plant was found to be promptly removed and taken out of the field for destruction.
5. Before the onset or at the beginning of the disease, timely rooting control or coarse spray control of the roots. Pharmacy can be used 72.2% Preclosure 600 to 700 times or 70% ethoxyphosh manganese WP wettable powder 500 times or 25% metalaxyl wettable powder + 40% thiram WP 1:1 mixture 500 times . Irrigate roots 200 to 250 ml per plant. Treatment once every 7 to 10 days, severe illness can be controlled every 5 days 1 time, continuous control of 3 to 4 times, the effect is better.
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