The main control measures of tomato late blight

Tomato late blight is one of the most important diseases in tomato growth and occurs in some areas. Tomato late blight protection ground, open pits can occur, but the main damage to the tomatoes in the protected area. Late blight is a low-temperature, high-humidity disease that is prevalent in early spring and late fall. The year of continuous rainy weather is a serious hazard. The disease is harmful during the entire growth period of tomato. The bacteria infested seedlings, leaves, stems and fruits. With leaves and fruits most affected. Infect the leaves and young fruit first, and gradually spread to stems and petioles to make it dark brown. The prevention and treatment of the disease should adopt comprehensive prevention and treatment measures based on agricultural control and supplemented by chemical control. The main measures are:

1, choose resistant varieties.

2. 3 to 4 year rotation with non-sweet potato vegetables. Select land plots with high dryness, convenient drainage and irrigation, and grow densely. Cultivate disease-free and strong seedlings, rationally apply nitrogen fertilizer, and increase potassium fertilizer. Drain the water immediately after the rain. Strengthen the ventilation and light transmission, and timely release the wind when planting in protected fields to avoid condensation or water film on the leaves of plants to reduce the degree of disease. After the harvest, the fallen leaves of the diseased plants are completely removed and the source of infection is minimized.

3. Chemical prevention and control: Appropriately control the watering in the early stage of disease, and pay attention to enhanced ventilation and reduce air humidity in the protected cultivation. Spray 75% chlorothalonil wettable powder 700 times, or 64% antivirus WP 500 times, 50% epothilone WP 800 times, 90% venom cream 500~600 times spray , spray once every 7 days or so, even spray 2 or 3 times.

YT-S350

YT-S350

YT-S350

Shenzhen Sunshine Technology Co.,Ltd , https://www.yatwinsz.com