Tomato early blight prevention and treatment

Symptoms: Both the seedling stage and the adult stage can be affected, mainly affecting leaves, stems, flowers, and fruits. The leaves were initially presented with a small black spot with a large needle tip, and later developed as an expanding ring vein spot with more light green or yellow halo around the edges, a central concentric ring pattern in the middle, and burr-like unevenness on the surface of the roule; stems were infected , In the branches, brown to dark brown irregular round or oval lesions, concave or not concave, surface grayish black moldy; petiole victims, oval oval ring stain, dark brown or black, generally Do not encase stems; infected fruit, beginning near the calyx, initially oval or indefinite brown or black spots, depression, diameter 10-20 mm, late fruit cracking, hard part of the disease, dense black mold layer.

Transmission route and onset conditions: The wintering of mycelium or conidia on the diseased body or seed can directly invade from the stomata, lenticels or epidermis to form the initial infection, and the lesions appear after 2-3 days of incubation. , Produce conidia 3-4 days, and repeatedly infested by airflow, rain. When the tomato enters a vigorous growth and the fruit rapidly expands, the pathogen accumulates over the tomato field. When the average temperature is about 21°C for 5 days, the rainfall is 20-46 mm, and the relative humidity is higher than 70%, the disease begins to occur. popular.

Control methods: 1. Adjust the temperature and humidity in the shed, especially in the initial stage of planting. The boring time should not be too long to prevent excessive humidity in the shed. 2. According to the requirements of formula fertilization, fully apply base fertilizer and timely fertilizer. 3. Spray 75% chlorothalonil wettable powder 600 times, 58% metalaxyl manganese zinc wettable powder 500 times or 80% dimethomorph water dispersible granule 20-25 g/mu before onset. 4. Implementation of crop rotation, close planting.

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