First, the characteristics of the disease The disease can damage tomato leaves, petiole, tender stems and fruit. Mostly from the lower leaves of the disease, from the tip of the leaf, leaf margin, the beginning of the lesion is dark green water stains, gradient dark green, wet at the disease grow sparse white mold layer; stem damage, lesions by Water stains become dark brown irregular or strip lesions, a little sunken, the organization becomes soft; the damage of the tender stems can cause contraction dead, also grow white mold layer in the wet. The incidence of fruit is mostly uncolored. The dark brown irregular skin lesions appear on the skin and gradually spread to the lower part of the skin. There is no clear boundary at the periphery. The surface of the skin is rough, the color is deep dark tan, and it also grows white when wet. Mold layer.
Second, the occurrence of regular germs mainly in the protection of tomato plants overwintering. The sporangia are transmitted through wind and rain or air flow. They invade from the wounds and lenticels of the stem. If the conditions are suitable, the disease will occur within 3-4 days, and a large number of new sporangia will be produced, which can be re-infected after propagation. The epidemic of late blight requires low temperature, high air humidity and large temperature difference between day and night. This condition is suitable for germination and infection of the sporangia of the pathogen. In the cultivation of low-lying land, soil viscosity, poor drainage, excessive dense planting, soil lean or partial nitrogen fertilizer, greenhouse insulation effect of the site is prone to this disease.
Third, comprehensive prevention
1. Agricultural measures shall be planted on sorghum deep-groove covered plastic film, and the surface shall be leveled to facilitate drainage, timely cultivating, weeding and pruning shall be adopted, and film-covered protection and cultivation shall pay special attention to ventilation and dehumidification; reasonably dense planting, increasing light transmission, and prohibiting large watering Water irrigation, the use of small water pouring, the greenhouse should be ground ventilation, reduce the humidity inside the greenhouse to prevent high humidity caused by disease. Increase the application of high-quality organic fertilizers and phosphorus and potassium fertilizers to enhance plant resistance.
2. Chemical control starts spraying at the seedling stage to prevent disease. General use of 64% antivirus WP (or Dasheng M-45 WP) 500 times every 7-10 days; timely detection and removal of central disease Strains, then sprayed with 58% metalaxyl-manganese zinc WP 500 times, or 58% thiram MnZn wettable powder 600 times, or 72% DuPont dew wettable powder 1000 times, every 7 Once a day, even spray 2 or 3 times; another anti-virus mixed millet porridge (1:20-30) evenly smear disease culms, control effect is very good.
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