Many days of late rain and cold air in late April have caused a great impact on the growth of greenhouse vegetables. In May, we must pay attention to strengthening field management: (1) Pay close attention to time ventilation, ventilation, and humidity, but pay attention to the high temperature in the sunny midday shed. Harm, try to create a suitable growth environment for the crop. (2) When the weather is fine, timely applying 0.2% potassium dihydrogen phosphate for foliar fertilizer, so that the crop is robust, improve its resistance or disease resistance. (3) Adhering to the principle of “prevention from the main, comprehensive prevention and controlâ€, every day 7-10 days, alternate use of widely used broad-spectrum pesticides such as carbendazim and chlorothalonil in turn to prevent diseases. Crops such as watermelons and melons cultivated in greenhouses or sheltered from the rain have entered the fruit setting stage or inflated period. Management should pay attention to the following points: (1) Muskmelon grows in the female flowers that appear after the vine spreads, leaving the main vines generally. More than 12 knots of cranberry fruit. Fruit setting should not be too early to prevent the vegetative growth of the plants. (2) The normal growth of watermelon vines is slightly forward, if the vine heads upwards, the vegetative growth is too prosperous. The artificial pollination of the female flowers on the vines can suppress over-promoting vegetative growth, balance the vegetative growth and reproductive growth, and facilitate fruit enlargement. (3) The rainy weather will reduce the pollen vigor of the watermelon. At the same time, the stigma of the female flower will also affect pollination and fertilization. Therefore, in addition to trying to eliminate stagnant water in the shed and reduce the humidity in the shed, rainy days can be used to collect the male flowers one day earlier, put them under a light bulb and dry them, and conduct artificial pollination in the early morning of the next morning to increase the fruit setting rate. (4) In case of long-term rainy weather, the increase of soil moisture content will cause plant wilt disease (Wildworm disease), and it can be prevented by watering roots with 800-1000 times liquid of withered wilt, legume and so on. At present, tomato late blight and leaf mold are serious in some greenhouses. Farmers can use 64% anti-disease wettable powder 500 times liquid and 72% nureli wettable powder 600-800 times, in addition to timely removal of diseased leaves and diseased fruits. The liquid or 72% Kelu wettable powder 600-800 times spray to prevent late blight; spray 75% chlorothalonil WP or 50% carbendazim wettable powder 500 times liquid leaf disease control.
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