Greenhouse tomatoes are easy to cause gray mold, gray mold like low temperature, high humidity, low light, and the winter greenhouse can meet its conditions, then, how to effectively prevent greenhouse tomato gray mold?
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First, the greenhouse tomato gray mold disease - control of the disease source
(1) Disinfection of soil chemicals. When ploughing before sowing or planting, apply 50 kg of carbendazim 1.5 kg or 50% dikesone 1 kg to kill pathogenic bacteria in the soil.
(2) Greenhouse tomato gray mold - high temperature shack. Select the sunny day before planting the tomato, buckle the shed film, and sterilize the shed. The temperature in the shed can reach 50-60 ° C for 7-10 days, which can kill the pathogenic bacteria in the shed and reduce the occurrence of diseases. Generally come to
It is said that the highest temperature in the shed can reach 70 °C in the summer and autumn when the temperature is high, and the shed will be 7-10 days at this temperature, which can kill most of the bacteria and pests in the shed.
Second, greenhouse tomato gray mold disease - ecological prevention and control
(1) Adjust the temperature and humidity through ventilation, and carry out variable temperature management to minimize the indoor temperature in the range where gray mold is suitable (16-23 °C).
(2) Scientific fertilization, appropriate application of phosphorus and potassium fertilizer to improve the disease resistance of plants.
(3) Using submerged dark irrigation or drip irrigation technology to reduce the humidity in the greenhouse and prevent flooding.
(4) Remove the residual petals and stigmas in the early stage of the disease, remove the diseased leaves and diseased fruits, remove the diseased plants, and take them out of the shed, and concentrate them deeply or burn them. After the harvest of the tomato, the leaves and leaves are cleared out of the shed and collected in a timely manner. Avoid throwing them in the fields to prevent further spread and infection.
(5) Select high-yield, gray-tolerant varieties suitable for local cultivation.
Third, the greenhouse tomato gray mold - scientific use of chemicals to control
(1) Grab the medication in three key periods. 1. Spray an “alternative medicine†before planting. On the tomato seedbed, a protective spray was sprayed with 50% keering wettable powder 1500 times to prevent the spores of the sclerotia from infecting the young; 2, when the flower was taken, the first ear was flowering, and it was already After a good tomato spirit or a 2,4-day dilution, add 0.1% of 50% keeling wettable powder and mix well, then carry out the scented flowers; 3. In the watering of the water (especially in the first and second Spike fruit-promoting water) is applied on the day before and at the onset of the disease, forming a protective film on the surface of the fruit to inhibit the infection of the fruit by Botrytis cinerea. 50% speed Keling wettable powder 1500 times liquid, or solar greenhouse tomato winter spring cultivation technology 65% ​​anti-mold wettable powder 1500 times liquid, or 65% moldy mildew wet powder 800 times liquid, or 50 % multi-mildulence wettable powder 1000 times solution, or 28% gray mold WP 1500 times solution, or 65% carbendazim wet powder 1000 times solution, or 25% pyrimethanil wet powder 800 times solution. Spray should be carried out on a sunny morning, 7-10 days, even spray 2-3 times.
(2) Improve the spraying technology: 1 spray should be comprehensive. Not only the plants should be carefully and meticulously sprayed, but also the greenhouse film, the ground and the space inside the shed should be sprayed to achieve complete sterilization. 2 Spraying should grasp three key points. First, the humidity in the greenhouse is high and the disease is high, so it is necessary to focus on spraying. Second, the middle and lower leaves of the plant and the back of the leaf should be sprayed with focus: Third, the plants around the central disease plant should be sprayed with focus. .
(3) Reasonable choice of application method. There are three methods for controlling the gray mold of tomato in greenhouse: spray method, smoke method and dust method. In the rainy (snow) weather, it is not advisable to use the spray method. The smoke method and the dust method should be selected.
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