Prevention and treatment of tomato early blight

Early blight, also known as ring disease, is a major disease in tomato production, which can occur in tomato producing areas and becomes a barrier factor in vegetable production. Tomato leaves, stems and fruits can be killed. The leaves are damaged. They are small brown spots in the initial stage. They are round or elliptical in shape and have a diameter of 1 to 3 cm. The edges of the lesions are dark brown, central brown, and have concentric circles. Sometimes the lesions sometimes rupture in the middle. Black mold on the lesions when wet. Most of the stems are affected by lesions at the branches, which are gray-brown, elliptical, slightly concave, with round or inconspicuous, and can cause branching when severe. Most of the fruit is brown or dark brown on the shoulders, slightly sunken, and the lesions with concentric circles are covered with black mold. Tomato early blight usually begins in the early stages of the results, and the disease is heavy at the peak. High temperature and high humidity are beneficial to the disease. When the temperature is about 15 °C and the relative humidity is above 80%, the disease begins. When the temperature reaches 20 °C ~ 25 °C, the condition develops rapidly. The following comprehensive measures can be taken to prevent and treat this disease. 1. Improve the environment Protect the tomatoes from the ventilation, reduce the humidity in the shed; open the tomatoes to do the drainage work, so that the rain stops the field and reduces the humidity in the field. 2. Rational fertilization Apply organic fertilizer, increase compound fertilizer, and improve the disease resistance of tomato plants. 3. Smoke control Tomatoes that protect the ground can be smoked with chlorothalonil, but the first smoke must be carried out before the onset to ensure the control effect. Each time with 0.25 kg of chlorothalonil per acre, divided into 6 packs, scattered in a greenhouse or greenhouse, smoked in the evening, medicinal dark fire (such as cigarette butts or incense heads) ignited, close the door after smoking, every 5 Smoked once in ~6 days, can not be interrupted. 4. Spray control The seedlings in the seedbed start to spray, so that the seedlings are not sick. After planting, strengthen the disease investigation, and immediately spray the drug once it is found. Can spray 70% mancozeb 500 times solution, or 75% chlorothalonil 600 times solution, or 40% sterilized Dan 400 times solution, or 40% Dafudan 500 times solution, or 50% chlorhexidine 1000 times solution Spray once every 6 to 7 days and spray continuously for 3 to 4 times. The spray is fine and uniform, and the leaves, stems and fruits are sprayed, otherwise the control effect is affected. If it rains after spraying, it should be refilled in time.

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