Comprehensive Control of Whitefly in Greenhouse

The greenhouse whitefly is an important pest on greenhouse vegetables. It uses adults and nymphs to suck sap from the back of leaves. The damaged leaves chlorosis, yellowing, wilting, and even the whole plant withered and secretes a lot of honeydew, which easily induces coal pollution. Contaminate leaves and fruits and cause vegetables to lose their value. Whitefly has a wide range of parasitic mistletoe, and it can feed 670 families and 114 families. The vast majority of vegetables can be affected, especially cucumbers, beans, tomatoes, and eggplants. The optimum temperature for whitefly reproduction is 18 to 21°C, and it can occur in more than a decade under greenhouse conditions. Whitefly on a winter greenhouse crop; source of insects on spring exposed vegetables. In recent years, due to the close connection and mutual replacement of greenhouses and open vegetable production, the annual occurrence of whitefly has occurred. The comprehensive prevention and control measures are as follows: 1. Agricultural control measures the use of late fall, deep winter, and early spring when it is time to clear the fallen leaves in the shed and uncover the cooling of the film to freeze the insects in the shed. Avoid planting vegetables such as cucumbers, tomatoes, eggplants, beans, etc. that cause serious damage to whitefly near the greenhouse, and promote the cultivation of cruciferous vegetables that are not suitable for whiteflies. In the first place of the greenhouse, it is best to plant low-temperature vegetables such as celery, spinach, garlic, etc., which do not like to eat, and reduce the planting area of ​​cucumbers and tomatoes. Reasonable intercropping to avoid mixing cucumbers, tomatoes and beans. To cultivate "no insects". The seedbed is separated from the production greenhouse, and the insects are completely smoked before the nursery, and sealed with a nylon yarn at the vent to control the foreign insects. 2. Chemical control Whitefly generation overlaps severely. At the same time on the same crop, adults, nymphs, eggs and cockroaches are present at the same time. Therefore, the use of chemical control must be continuous and multiple times in order to improve the control effect. The commonly used pharmaceuticals include 10% buprofezin 1000x, 2.5% Uranus 3000x, 25% Xenon Meng 1000x, 2.5% kungfu 3000x, and 40% dimethoate 800~1000x. In addition, 22% dichlorvos smoke agent 0.5 kg/667 square meters can also be used to seal fumigation in the shed in the evening, or to heat fumigation with 80% dichlorvos EC and water mixed in a ratio of 1:1. 3. The biological control of whitefly has a small number of natural enemies and its inhibitory effect is not obvious, but it can be controlled through artificial breeding, release of natural enemies, and control of whitefly. When the whitefly adults were 0.5 or less, they were released once every two weeks. A total of 15 adult bees were released 3 times, or within 3 to 4 months of the initial occurrence of whitefly. Grasshopper 10 heads per square meter, with good results. According to another report, the Beijing Academy of Agriculture and Forestry Sciences uses a cesium cultivar that uses corn meal as its main medium to prevent and control whitefly. The parasitic rate of nymphs can reach more than 80%. 4. Physical control 1 Yellow plate trapping. Whitefly has strong tropism toward yellow, yellow traps can be trapped and killed in sheds. The method is to use waste fiberboard or cardboard, cut into 10.2 meters long strips, painted with orange peel yellow, and then coated with a layer of sticky oil (you can use 10 engine oil and a little butter and mix thoroughly), put 32 per 667 square meters ~ 34 pieces, placed between rows, height and plant level; when the whitefly sticks to the board surface, re-coat a stick of oil. 2 silver gray film insecticide. For every 667 square meters, 1.5 kg of silver ash film is used, cut into 10 to 15 cm wide strips and pulled into a mesh shape to repel whitefly.

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