With the widespread promotion of greenhouse vegetables, the problem of vegetable pests in greenhouses has also received attention. Among them, whitefly is one of the more common pests. Xiaobian today tells you how to prevent and control greenhouse whitefly.
Physiological characteristics of whitefly
The whitefly is very small, and the adult is more than 1 mm long; the whitefly and the nymph have white wax or waxy protrusions or waxy filaments; the whitefly sucks the leaf juice to form yellow spots and even makes the whole leaf Yellow, plants withered and dead; white-flying adults have wings, people will fly when they are close, it is difficult to catch; although white individuals are small, but the number of groups is large; whitefly in the north occurs more than 10 generations a year, the development speed is fast The ability to reproduce is strong, and the overlapping of generations is prominent.
Control method of whitefly
Cultivation control: including removing all kinds of plants and their residues around the shed, reducing the source of insects; cultivating celery, rapeseed, leeks, etc., which are not like food, should be planted around the shed; pay attention to the cultivation of wormless seedlings, even in the nursery setting 24 -30 mesh insect screen.
Yellow plate trap: Using the tendency of whitefly to yellow, a special yellow armyworm plate is placed in the shed, which is equal to the crop or in the upper part of the vegetable canopy. Apply No. 10 engine oil and brush the oil every 7 days.
Spot control: Chemical control is carried out at the stage of spotting. The following agents can be applied, 10% chlorpyrifos 1000 times solution, 10% imidacloprid WP 2000 times solution, 30% acetamiprid 1000 times solution, 1.8% avermectin 2000 times solution, 25% guanidine manganese 1000 Double solution, 10% bifenthrin 1000 times solution, or fenpropathrin, cyhalothrin, and the like.
Prevention and control of the small bee: The artificial release of the small bee can effectively control the greenhouse whitefly. It is necessary to release the Lizard bee immediately after the discovery of the whitefly, and when each plant has less than one white mites, release 1000-3000 larvae per acre. When the number of insects is large, the number of natural enemies should be increased accordingly. Need to release 2-3 times in a row.
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