Vegetable Disease Prevention and Control Techniques

First, the symptoms of vegetable diseases: tomato disease also known as tomato late blight. Harmful to the stems, leaves and fruits of tomatoes, the damage to the leaves and green fruits is severe. When the disease occurs, the production is often reduced by 20-30%, causing serious damage to the shed. In the seedling stage, the seedlings often cause the wilting of the seedlings. The adult plants often fall from the lower leaves. The wilting of the stalks causes the final plants to wilt or break from the diseased part. The fruit is affected. The dark greenish oily spots appear on the side of the green fruits and gradually turn dark brown. To tan, the disease is hard but not rot, and a layer of white mold grows on the edges when wet. Cucumber blight is commonly known as dead vines. When the young seedlings were injured, the young shoots were dark green water-stained and wilted, gradually withered but not lodging; leaf lesions eventually appeared round and dark green water-like, soft and rotted when wet, dry and blue-white, easily broken and perforated; stems Severe incidence of nodes and petioles, dark green watery contracture, soft rot, wilting of diseased leaves or more, and severe disease when the whole plant withered; melon strips were dark green water stains after illness, slightly depressed, high humidity Melon soft rot, long sparse white mold, smelly odor.
Second, the prevention and control of epidemics: selection of disease-resistant varieties, multi-variety rotation or mixed cultivation, play their own disease resistance, disease prevention effect. Does not work with susceptible tomatoes, cucumbers, peppers, and potatoes to block or reduce the source of soil contamination. Tomatoes, cucumbers, and peppers under shed conditions are cultivated in small sorghum to enhance the ventilation management after irrigation, and non-dropping membranes are used to prevent dripping from the membranes, and close-to-plant plants are used to improve air- and light-transmitting conditions between plants and reduce the temperature difference between day and night. Avoid the condensation of leaves and the formation of water film, and increase the application of phosphorus and potassium fertilizer.
All kinds of infected vegetables, found that the central disease should be promptly removed, and the use of 1:1:200 Bordeaux fluid blockade of the disease center. The whole shed of tomatoes is controlled by drugs: available 64% antiviral M8 WP 500 times, 25% methicillin WP 600 times, 58% MnZn WP 500 times, 40% epidemic 250 times wettable powder spray, each time the amount of liquid 25-30 kg, 5-7 days once, once every 3-4 times. Cucumber sheds for drug control: 75% chlorothalonil 600x, 50% cetanol 5000x, 64% antiviral M8 WP 500x, 25% trefenrel, and 54% thiram 1 1 mixture of irrigation roots. The potato late blight can be sprayed with 40% EB 200 times solution and 25% metalaxyl stalk and leaves; when mixed with early blight and late blight, 58% metalaxyl MnZn 500 times can be sprayed 2 times. -3 times.
Liu Wei

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