In winter, the main diseases of greenhouse cucumbers include: cucumber downy mildew, powdery mildew, etc.; pests include aphids, whiteflies, and spotted flies, etc. In the overwintering greenhouse cucumber management, we must strengthen cultivation and fertilizer management, and increase phosphorus and potassium fertilizers. Improve the disease resistance of plants, pay attention to ventilation, light transmission, and humidity in the greenhouse, creating conditions that are not conducive to the occurrence of pests and diseases. In the initial stage of pests and diseases, effective chemical control measures should be taken to control the pests and diseases so as to extend the period of melon harvesting and achieve the purpose of increasing production and income.
Cucumber downy mildew. Commonly referred to as "black hair", "running horse" and so on, the lack of prevention and control will cause serious losses. Downy mildew only damages the leaves. After the seedlings are unearthed, the cotyledons can become infected, and irregular green spots appear. Lesions on the leaves, water droplets on the leaf margins or on the back of the leaves are irregularly shaped lesions, and lesions develop as the disease progresses. Due to the limitation of the veins, the lesions are yellow-brown lesions with a polygonal shape. When the leaves are wet, there is a dark blue mold on the back of the leaves. It generally spreads upward from the lower leaves. In severe cases, the lesions communize with each other and finally the entire leaf is shriveled.
Control methods: 72.2% Preclo 800X, or 58% Ledomil WP 500 times, or 64% WP WP 400 times, spray every 7-10 days , even against 2-3 times. Winter Rainy Snow Weather To reduce the humidity in the greenhouse, use 45% chlorothalonil aerosol, 250 g per mu, place 4-5 points in the shed, ignite darkly, smoke overnight in closed shed, or 5% chlorothalonil dust 1000 grams per mu, closed the night, the morning release, once every 7 days.
Cucumber powdery mildew. The main damage to the leaves, the initial formation of oval-shaped star-shaped white spots on the leaf surface, the posterior four-sided expansion into a contiguous white powder with indistinct edges, full of the entire leaf. Cucumber petiole, stems can be infected.
Prevention methods: winter rain and snow weather to reduce the greenhouse humidity, per acre with 45% chlorothalonil smoke agent 250 grams, divided into several lit, sealed fumigation overnight; in the early onset with 20% triadimefon 2000 times spray control , Or 2% Wuyimycin water 200 times, or 20% more than 200 times antimycotin, or 12.5% ​​speed Baoli WP 2000 times liquid and other agents spray control. Spray once every 7 days, even 2-3 times. In addition, 5% chlorothalonil dust can also be used for prevention and treatment.
Liriomyza. The larvae invade the leaves and petioles and invade the leaves. They feed on the leaves and form serpentine tunnels, destroying the chlorophyll and affecting photosynthesis. In severe cases, the leaves fall off and their generational overlap is more difficult to control.
Control methods: yellow traps can be used to combine adult insecticides with chemical control measures, with 1.8% etodiate EC 3000 times, or with 20% spot macerate 24 grams per acre plus water 45 kg spray control, once every 7 days, Spray 3-4 times.
Locust, whitefly. The locusts and whiteflies breed quickly, and the population is large. Except for the sap from the leaf sucking virus, the secretion of honeydew also seriously affects the quality of the product, resulting in reduced production.
Control methods: Yellow sand traps can be used to combine adult insecticides with chemical control measures, with 30% smoked smokers, 420 grams per mu for smog prevention, or 25% Aktai water dispersant, 3 g per mu 45 kg spray of water is used for prevention and control. Once every 7 days, once every 3-4 times, you can receive better control effect.
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