Late blight is the main disease of greenhouse tomato, especially in autumn and winter, the result of tomato is the most prone to occur. If it is difficult to control, it will cause the whole shed tomato to produce absolutely, so early detection, early removal, early control and early cure are needed. In order to achieve better economic benefits. Symptoms of late blight: Tomato late blight can occur from the seedling stage to the end of the crop. It damages both the leaves and the stems and fruits, and leaves and fruits are the most affected. Generally from the front of the shed to the onset of disease, first invade the leaves and young fruit, and gradually spread to the stems and petioles to make it dark brown, severe plant wilting break. The fruit of the disease was hard and uneven, with a dark greenish oily appearance at the beginning and a dark brown to tan afterwards. In general, the susceptible fruit did not become soft and rot. When the humidity is high, white moulds can be seen at the junction between the front and back of the leaves. Prevention: 1. Choose disease-resistant and disease-resistant varieties. Serious disease greenhouses must achieve rotation for more than three years, and can plant non-sweet potato crop rotation. 2. High ridge cover film cultivation; suitable planting density, not too dense, early scaffolding, timely pruning, appropriate removal of the plant's lower leaves, yellow leaves and diseased leaves, improve ventilation and light transmission conditions. The use of formula fertilization techniques, combined use of nitrogen, phosphorus, and potassium fertilizers, increased potash fertilizer can reduce the incidence of disease. Pay attention to reasonable irrigation, avoid flooding irrigation. 3. After exposing the weeds every morning, check the leaves and fruits of the tomatoes in the shed. Focus on the tomatoes 1 to 2 meters in front of the shed, find the central diseased plants, and immediately remove the plants or remove diseased leaves and diseased fruits. , Bring out of the shed or burn down, reduce the spread of the field, and control the occurrence of diseases. 4. Temperature and humidity control. The tomato's result period requires the daytime temperature to be maintained at 25°C-30°C, nighttime at 12°C-15°C, and the minimum temperature not to be less than 10°C. In the deep winter, when the temperature is low, it must be covered with straw curtains. At the same time, the grass curtains are covered with films. On sunny days, when the room temperature reaches 30°C, the air is released in a timely manner, and when the room temperature is high, the air is released in a short period of time. 5. Scientific medication. Field diseased plants should be removed from the field, and diseased leaves and diseased fruits should be removed. Use 50% Anke-Manganese Zinc WP 500 times, 72% Kelu WP 800x, 72.2% Prec Water 800x or 58% of toxic MnZn wettable powder 500 times spray. The leaves, stems, green fruit, etc. must be sprayed. The middle and lower parts of the plant are the key spray areas and should be used for rotation. In case of rainy days, dust or smoke can be used for prevention and control. Dust method: Mu with 5% chlorothalonil dust 1 kg spray powder. Smoke agent method: 45% chlorothalonil smoke agent or 10% fast Ke Ling smoke agent 200 to 250 grams of smoked shed. Hemp Acupressure Mat,Acupressure Relief Mat,Acupressure Therapy Mat,Acupressure Mat And Pillow Ningbo Prestigeplus Commodity Co.,Ltd , https://www.prestigemedics.com
Greenhouse tomatoes guard against late blight
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