Tomato late blight is one of the most important diseases in tomato, and it can occur in protected areas and open fields. When the disease is severe, the stems are rotted, the plants are wilted and the fruits are brown, which affects the yield. Tomatoes, Phytophthora infestans are mainly wintered in the soil with mycelium and diseased bodies. After the sporangia of the pathogen has fallen on the plants through airflow and rainwater, it germinates in water and produces zoospore, and the zoospores germinate again and invade the plant tissue. Go to. When a central diseased plant is formed in the field, a large number of propagules are produced, and then the water droplets spread around and gradually form a common disease. First, the incidence conditions 1, climatic conditions. The temperature at the 25 °C incubation period is the shortest, only 3 to 4 days, and the high temperature is not conducive to the epidemic of the disease. The requirements for relative humidity are more stringent, and 75% can occur above. 2 Cultivation conditions. Plants are luxuriant, low-lying and poorly drained. When the humidity in the field is too large, it is conducive to the occurrence of diseases. Infertile soil plants are weak, or partial application of nitrogen fertilizer causes the plants to grow long, and the tomato is in the middle and late stages of growth, which is conducive to the occurrence of diseases. 3, varieties. Disease-resistant tomato varieties are less susceptible to disease. Second, prevention and control measures 1. Cultivate disease-free and strong seedlings: The pathogens mainly live in the soil or in the sick and overwintering. Therefore, the seedling-cultivation soil must be strictly selected from soils that have not been planted with solanaceous crops, and it is recommended to cultivate disease-free Zhuang with nutrients, nutrition bags, and plug trays. Seedlings; colonization using high-skilled 20ml + silver Farley 50ml + Swiss micro 5g root 2500-3000 seedlings, to ensure sterile insect-free seedling colonization. 2, to strengthen field management: Shizujifei, the implementation of formula fertilization, to avoid partial nitrogen fertilizer, increase phosphorus, potassium fertilizer. After the planting, weeds should be controlled in time, according to the results of different varieties of the results, reasonable pruning, topping, burping, reduce nutrient consumption, and promote the growth of the main stem; 3, rational dense planting: according to the length of the growth period of different varieties, the results of habits, the use of different dense planting methods, such as: double stalk pruning per acre, planting about 2000 strains, single stalk pruning per acre planted 2500 ~ 3500, a reasonable dense planting, It can improve the ventilation and light conditions in the field, reduce the humidity in the field, and reduce the occurrence of diseases. 4. Chemical control: First, use 500 grams of fluid + 600 times of Wanhua to reduce pathogenic base number; after 3-5 days, spray 600 times of silver solution and 600 times of Antai to inhibit the growth of pathogens. Up to 20 days or more. Avoid the high temperature time, the best application temperature is 20 °C -30 °C.
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