Autumn tomato to prevent two diseases
Autumn tomatoes are loved by farmers because of their high yield, high efficiency and excellent quality. However, the incidence of virus disease and bud blight is high in tomato in the fall season. This problem is commonly found in nursery under high temperature conditions. Therefore, preventive measures should be taken in a targeted manner: Virus disease, high temperature and drought are the most important conditions for disease development. . Appropriate pathogenic temperature of virus disease is between 38°C and 43°C. Below 35°C or above 45°C, it is not conducive to disease occurrence. In the daily cultivation and management, artificially regulate the temperature, you can seek benefits and avoid hazards, the specific measures are as follows: Timely watering From the seedling colonization to the middle of fruit setting, the surface of the shed should be kept moist, and the surface water content should not be less than 75% to 80%. Air humidity in the shed is not less than 70%. The temperature control shall adopt the morning and evening open air, nighttime open air (under nocturnal rain conditions), and the method of avoiding wind at noon, especially when the light intensity at noon is high, the wind should be avoided earlier. The main purpose is to ensure that the air in the shed has a high moisture content, and reduces the evaporation of water, ensuring that the leaves and growth points of the plants are not wilted by the transpiration of water, and the leaves of the plants on both sides of the wind outlet are prevented from drying out due to strong light. The main methods are: (1) using a hand-pressure sprayer or a motorized sprayer to promptly spray the leaves; (2) using a shade net for physical control, generally pulling the sunscreen at 10:00 a.m. every day, and seeing light after 5 pm. Can effectively control the occurrence of viral diseases. Chemical prevention and treatment in the early stage of the disease with a time of 1.5% phytosanitary WP 600 to 800 times. Or 20% of the virus A800 ~ 1000 times, or 60% of the virus King WP 800 to 1000 times spray control, especially 60% of the virus King WP to control the occurrence of disease and passivation virus effect is obvious and pollution-free. Bud blight is a kind of physiological disease, which is affected by the climate. High temperature and drought are the main factors of the disease. Symptoms are: growth point growth was significantly inhibited, was spherical, the first inflorescence leaves rapid lateral growth, branches and leaves hypertrophy. Control methods: (1) Use shade nets to avoid light. The method is the same as the physical prevention and treatment of viral diseases; (2) Regulation: Use 920 growth regulators to add 35 kilograms of water, and spray evenly on the top of the plants. The cure rate is above 95%.
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