Occurrence and Control of Major Diseases and Pests of Cucumber in Overwintering Greenhouse

The major diseases and pests of wintering greenhouse cucumbers include: cucumber downy mildew, gray mold, powdery mildew, insect pests such as aphids, whiteflies, and spotted flies. In addition to regulating temperature and humidity, replenishing fertilizer, and increasing plant resistance, cucumbers are managed in overwintering greenhouses. To create conditions that are not conducive to the occurrence of pests and diseases, effective chemical control measures should be taken to control the pests and diseases to prolong the period of melon harvesting so as to increase production and income.

1. Cucumber downy mildew is mainly expressed on the leaves and begins to produce water-stained spots. After the expansion, the leaves are limited to yellow-brown spots due to the limitation of the veins, and the smuts grow on the leaves when wet. It generally spreads upward from the lower leaves. In severe cases, the lesions communize with each other and finally the entire leaf is shriveled. For prevention and treatment, 72.2% Preclosure 800 times, or 58% Ledomil WP 500 times or 64% WP 400 times, spray every 7-10 days. In order to reduce the humidity, 45% of chlorothalonil aerosol can be used, 200-250g per mu, placed in 4-5 indoor places, ignited by dark fire, smoked in closed shed for one night, and released in the morning, once every 7 days.

2. Botrytis cinerea mainly damages young larvae, leaves, stems, etc. The pathogenic bacteria invade from the female flowers that have lost the opening, causing the petals to decay, and giving off a gray mold layer, which causes the rotten melon to spread to the young melons. Diseased melon surface with gray mold layer. Rotten melon or burnt-out, detached to the leaf blade to cause foliar disease to form a round or irregular shape lesions, obvious edges, a small amount of gray mold on the surface, burnt or rotten melons attached to the stem, causing stem disease, serious When the vines are broken, the plants die. Control methods: In the early stage of disease, use 10% fast-king spirit agent 200-250 grams per mu or 45% of chlorothalonil smoke agent, 250 grams per acre for 3-4 hours, or 50% acetaminophen 1000- 1500 times liquid spray control, once every 7 days.

3. Cucumber powdery mildew: the main damage to the leaves, the initial formation of oval-shaped star-shaped white spots on the back or leaves of the leaves, with many leaves, the back of the four-sided expansion into a contiguous white powder is not obvious, Yan Dong covered with the entire blade. In the early onset, 20% triadimefon EC was used to control 1500-2000 grams of smoke.

4. Liriomyza. The larvae feed on the leaf epidermis under the epidermis to form a serpentine tunnel, and the generation overlap is difficult to control. The prevention and control methods can be combined with the yellow-trap adulticide method and the chemical control method. It can be treated with 1.8% Edeludin emulsifiable concentrate with 3000 times solution, or with 20% spot-potential netting for 24 grams/mu for adding water and 45kg for spraying, once every 7 days. Spray 3-4 times.

5. Locust, whitefly. Aphids 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 products and causes a reduction in production. Control methods can be used to control smoke by 30% of a smoked smoke agent per acre of 420 grams, or 25% of Acetate water dispersant, 2-4 grams of water per acre, and 45 kg of spray, every 7 days, once every 3.4 days. Can receive better control effect.

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