In the past two years, due to the influence of tomato yellow leaf curl virus disease, many regions have planted anti-virus disease varieties, and many of them have low resistance to fungal and bacterial diseases. With the continuous decrease of the outside temperature, the greenhouse has been getting shorter and shorter, the humidity in the greenhouse has not been discharged, and the tomato is susceptible to gray leaf spot and bacterial pith disease. Attention should be paid to prevention and control. In the early stage of the disease, the leaves were covered with round or irregular water-stained brown spots, which expanded along the veins and developed into irregular spots. The middle of the spots gradually faded from gray to gray-brown. The lesions are slightly concave, small and numerous, 2-4 mm in diameter, extremely thin, easily broken, perforated, or detached in later stages. After the onset, 33.5% quinoline suspension (750 times solution) and 25% bromocetonitril wettable powder (560 times solution) can be sprayed, and once every 5-7 days, continuous control 2-3 times. Tomato bacterial pith myopathy, also known as bacterial pith necrosis, should be focused on prevention and treatment in the winter, mainly in the lower part of the stalk of tomato disease. After the onset of the disease, a large number of adventitious roots are generated on the stalk, and the stalk can be seen in the medullary cavity with transparent Colloidal, leaf loss of water shrinks. The key to the prevention and treatment of bacterial diseases is early prevention. For the recently planted tomato, use 25% colubrum ammonia solution (500 times solution) and 25% triammonium cyanide WP every 10 days after easing the seedlings (500 times) Liquid) Irrigation, continuous irrigation 2-3 times to prevent the occurrence of disease. Plants that have already developed disease can be injected into the stalk with the above liquid to control the development of the disease. To control tomato diseases in winter, we should also pay attention to the management of greenhouses, with the temperature controlled at 25-30°C during the day and about 14°C during the night. When the relative humidity of the greenhouse is above 80%, timely ventilation, rational watering, and reducing the humidity in the greenhouse. At the same time, pay attention to pruning, not partial nitrogen fertilizer, in order to improve plant disease resistance.
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