First, the symptoms of vegetable disease: tomato blight is also known as tomato late blight. The stems, leaves and fruits that endanger the tomato are seriously damaged by leaves and green fruits. The incidence is often reduced by 20-30% when the disease occurs, which leads to the destruction of the shed when it is serious. In the seedling stage, the seedlings often cause wilting and lodging; the adult plants are mostly from the lower leaves, and the stems are eventually wilted or broken from the diseased part; the fruit is damaged, and the dark green oil-like lesions appear on the green fruit side, and gradually become dark brown. To the tan, the diseased fruit is hard and not rotted, and there is a white mold layer on the edge when it is wet. Cucumber disease is commonly known as the dead vine. When the seedling stage is damaged, it is slightly dark green water-stained, and gradually dry but not lodging; the leaf spot is finally round, dark green water stain, soft rot when wet, blue-white and easy to rupture perforation when dry; stem The disease and the petiole are severely affected, and the dark green water-stained contracture and soft rot appear. The leaves above the diseased part are wilting. When the disease is serious, the whole plant is dead; the melon strip is dark green water-stained lesions, slightly depressed, and the humidity is high. Melon strips are soft and rot, and there are sparse white molds and stinking smells.
Second, the prevention and treatment of epidemics: the selection of disease-resistant varieties, multi-varietal rotation or mixed cultivation, to play the disease's own disease resistance, disease prevention effect. Do not rotate with susceptible tomato, cucumber, pepper, and potato to block or reduce the source of soil infection. Tomatoes, cucumbers, peppers, etc. under shed cultivation are cultivated with small sorghum, and the ventilation management after irrigation is strengthened. No dripping film is used to prevent film dripping, reasonable close planting, improved ventilation and light transmission conditions between plants, and reduction of day and night temperature difference. Avoid leaf foliar condensation and water film formation, and increase the application of phosphorus and potassium fertilizer.
All kinds of diseased vegetables, found that the central diseased plants should be removed in time, and blocked the disease center with 1:1:200 Bordeaux mixture. Tomato whole shed implementation of drug control: 64% anti-virus 矾m8 wettable powder 500 times solution, 25% toxic mycelium WP 600 times solution, 58% toxic manganese-zinc wettable powder 500 times solution, 40% epidemic spirit The wettable powder is sprayed 250 times, the amount of liquid is 25-30 kg per time, and the drug is administered once every 5-7 days, and used 3 to 4 times. Cucumber whole shed implementation of drug control: available 75% chlorothalonil 600 times solution, 50% captan 5,000 times solution, 64% antivirus 矾 m8 WP 500 times solution, 25% ruthenium and 54% thiram 1: 1 mixture of roots. Potato late blight can be sprayed with 40% ethylphosphorus aluminum 200 times solution and 25% metalaxyl 800 times liquid; when mixed with early blight and late blight, 58% metalaxyl manganese zinc 500 times liquid can be sprayed 2 ~3 times.
Key points for prevention and control of vegetable diseases
Vegetable plague is a common disease of tomato, cucumber, pepper and potato. It is very serious, especially in the timely diagnosis and control of shed tomato and cucumber.
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