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How to prevent greenhouse stalk rot
Tomato stalk rot (stem-based rot) is the most serious disease occurring in greenhouses in the past two years. Light production is reduced, and severe cases are produced. Therefore, prevention and treatment should be carried out in time. 1 The main pathogens and pathogenesis tomato stalk rot mainly caused by the complex infection of Pythium and bacteria, soil-borne diseases, flooding irrigation and encounter ground temperature is the most vulnerable to disease. The main reasons are: 1 The soil is not disinfected or disinfected before colonization. In greenhouses, the continuous production of solanes and melons in successive crops causes many germs to coexist in the soil. Once the conditions are right, the disease will develop. 2 Overwintering greenhouses premature colonization of tomatoes, soil temperature during seedling stage is too high, after flood irrigation, the permeability of the roots is reduced, so that the bacteria in the soil in a large number of breeding under the appropriate temperature and moisture conditions, and invade the stem base vascular bundles, Let the plants feel sick. 3 The weak growth of tomato plants also makes soil-borne diseases organic. 4 other reasons, such as the tomato after experiencing a heavy rain, seedlings, rain directly immersed the tomato seedlings, coupled with heavy rain after the drainage and drug do not promptly cause the disease. 2 Major prevention and control measures 1 In the month before planting, the debris from the inside and outside of the greenhouse was cleaned up and transported out of the greenhouse for destruction, and the membrane was tightly closed. From August to September, the temperature was high. At the same time, the soil in the shed shall be ploughed in depth, combined with pouring 667 square meters of large-scale water and applying 20-30 kg of quick-acting nitrogen fertilizer or spreading broad-spectrum fungicides such as carbendazim and chlorothalonil, and then cover the film to kill most of the bacteria in the soil. . 2 Over the winter canopy colonization of tomatoes can not blindly advance, pay attention to late cover film. The appropriate colonization period for the wintering greenhouse tomato should be from late September to early October. All localities should be planted according to the actual situation. 3 strengthen the cultivation and management. Do not flood the irrigation, found that the ground temperature is too high, then the stem base soil drying. After planting seedlings, combining Apollo 963, Stirling, Plant Dynamics 2003 and other agents can improve the disease resistance of the plants combined with the prevention and treatment of viral diseases. Once the tomato plants show signs of illness, such as leaf wilting, slow growth, and dark surface of the base of the stem, they can be applied to the affected area with rhizome-protecting and clomazone 500-fold solution; the side of the stem is peeled off and the vascular bundle has turned yellow and the leaves are seriously wilted. , Root and Stem and Apollo 500 times can be used to irrigate the roots to promote the development of new roots; when the leaves are yellow, use 500 times solution of Kezikang or 100 times solution of Apollo 963, or use 500 times of chlorothalonil and Pythium. Irrigation of the roots; for the vascular bundle to become dark brown plants should be immediately removed and the soil sterilized to prevent germs from spreading with water.