In the cultivation of cucumbers in the greenhouse, the symptoms of wilting often appear, and the dead plants are severely caused. In addition, the wilting of cucumbers has been increasing year by year, which has seriously affected the yield of cucumbers. The common symptoms of wilting and prevention measures are described below: I. Wilt caused by blight Cucumbers will develop throughout the growing season, with the most severe onset of flowering to the result period. In the early stages of disease, the diseased plants showed that the leaves gradually wilted from the bottom up, appearing to be lack of water, and it was more obvious at noon, and it could recover sooner or later. After a few days, the whole leaf withered and no longer returned to normal. In wet conditions, the surface of the diseased part often produced a white or pink moldy layer. For the control of fusarium wilt, it can be used to irrigate roots with 2% agricultural anti-120 water agent 250 times or 50% carbendazim wettable powder 500 times liquid or 50% hymexazne wettable powder 3000 times liquid. Second, acute wilting The plant growth has been robust, but acute leaf wilting suddenly appeared at noon on sunny days. It recovered in the evening and cut off the base of the stem. No discoloration of the catheter and no milk spillage was observed. The reason is mainly due to the unripe grasshopper on a continuous cloudy day, the plants can not be photosynthesis, starving, low ground temperature, weak root activity, once sunny, the temperature of the greenhouse suddenly increases, the air humidity decreases, the leaf water transpiration is quick, the root absorbs The water function is weak, and the underground part will transport less water upwards, and the leaves will appear wilting. Preventive measures: For several days, in case of a sunny day, do not uncover all grasshoppers at once. It is best to uncover them first. Gradually open them later. When the leaves are wilting, sprayers can be used to spray the leaves. Excessive wilting damages the leaves. Third, the grafted cucumber seedlings caused by the poor quality of wilting At the beginning of the disease, the lateral roots of the black-skinned pumpkin rootstock were browned and rotted, and the main roots became pale brown to brown. In severe cases, the roots became light brown to brown, causing the plants to wilt. Control measures: First, control the amount of water to prevent flooding, especially when rain and snow are prohibited. The second is ploughing. Loose soil to prevent soil compaction. Third, chemical control, with 70% thiophanate-methyl 800 times or 70% mancozeb WP 500 times solution root irrigation, 250 ml per strain of liquid, to prevent disease. Fourth, the wilting caused by flood irrigation After irrigation, the soil moisture content is too high, the air permeability is poor, and toxic substances are produced in the soil under anoxic conditions, so that the root system poisons or lacks oxygen to suffocate and wilts. Control measures: 15 to 20 days prior to colonization of cucumbers, planting of muddy water. If the living soil layer is too deep, it should be levelled again after watering, so that the soil can reach deep, transparent, fine, flat and solid standards. Watering is suitable for drip irrigation to avoid flooding and maintain good air permeability. Five, wilt caused by root knot nematode damage Root-knot nematodes are generally distributed in the soil layer of 3-9 cm above the ground. The roots of the affected species form root nodules and become swollen. After the root tissue is destroyed, the absorption and transportation of fertilizer and water are hindered. The plants are dwarfed, the leaves turn yellow, and the leaves are severely wilted. Or death. For the control of root-knot nematode diseases, the soil may be treated with a chemical agent before planting, or rooted with a 1.8% solution of 1.8% abamectin EC in the growth stage. Sixth, the fertilization caused by excessive concentration of wilting Excessive fertilization, especially when applying chemical fertilizers near the roots of cucumbers, can easily burn the plants. Applying higher nitrogen fertilizers will produce ammonia in the decomposition process in the greenhouse. When the temperature rises, ammonia concentration is too high. Caused wilting die. Attention should be paid to the use of less-efficient fertilizers, more organic fertilizers that are decomposed, and extra-root topdressing, which can be sprayed with compound potassium dihydrogen phosphate, sprayed fertilizer and other foliar fertilizers. Blue Butterfly Pea Flower Powder
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Shed cucumber wilting to symptomatic treatment