With the advent of winter, counter-season greenhouse vegetables have reached the prime time of production. However, due to the relatively high temperature and humidity in the shed, the damage caused by the micro pests in the shed is affected, which affects the degree of vegetable production in the greenhouse. The symptoms and prevention measures of common micro-pests in sheds are described below. Insect species and hazardous symptoms Whitefly: Whitefly can occur for 8-10 generations in one year in the shed, and it cannot survive outdoors in winter. Whitefly adults and larvae absorb crop juices, and the damaged leaves retreat green, yellow, or wilting, and finally die. In addition, adults and larvae can also secrete a large amount of honeydew, contaminate the leaves and fruits of crops, cause coal pollution, and cause vegetables to lose their commercial value. Locust: Locust locusts mainly include Myzus persicae, Radish Astragalus and Caragana. The most widespread occurrence of Myzus persicae, mainly harms cruciferous vegetables and spinach, pepper, eggplant and so on. After the young leaves are damaged, the leaves roll down and the deformity shrinks. Hummer: The common thrips in greenhouses are guava horses, which use adults and nymphs to suck young leaves, shoots, flowers, and young fruit juices to cause harm. The grayish chlorotic spots appear on the leaf surface, which can lead to early flowering. Fall, dry leaves, new shoots without apical buds, leaves curled leaflets curled corrugated, veins yellowish green, yellow leaves with meat lesions, like flowers and leaves, and finally damaged leaves turn yellow, become brittle, fall off. The shoots of the new shoots were damaged. The growing points were inhibited, and the branches and leaves and the top buds shrank. Liriomyza sativae: Liriomyza huidobrensis, L. sativae, etc. are commonly found in the field. It mainly harms cruciferous vegetables, solanaceous vegetables as well as green onions, garlic and so on. Liriomyza sativae lays eggs in the tissues of the crop. The larvae feed on the leaves and destroy the chlorophyll, causing the leaves to lose their chlorophyll and reduce the photosynthesis efficiency. The leaves often produce obvious insect pathways due to the damage of the larvae of Liriomyza larvae, resulting in damaged mosaics. Prevention and control measures Agricultural control: First of all, after the harvest of vegetables, remove the broken leaves and leaves, and destroy them in a centralized manner to reduce the source of insects. Secondly, before the planting of the next crop, the insect nets should be set up early to prevent pests from entering the greenhouse. In addition, weeding must also be done. Physical control: Silver gray has a certain drive away from the locusts. This characteristic can be used to hang silver-gray plastic film strips in the field to drive maggots. Whitefly is yellowish and can be smashed with yellow plate. Chemical control: can be used to control aphids and whitefly. Can be used 10% imidacloprid wettable powder 1500 times spray to control thrips. It should be noted that no matter what kind of medicine is used to control which kind of pest, it is necessary to pay attention to field observations. The prevention and treatment should be conducted before the occurrence of the peak of insect pests. The spraying site must be uniform and different agents should be used in rotation. The use of the same pesticide should not exceed 3 times.
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