With the adjustment of the agricultural industrial structure and the continuous increase in the area of ​​vegetables, the diversity of cultivation methods such as open fields, greenhouses, and off-season vegetables has caused the annual occurrence of locusts, whiteflies, plagues, and thrips, including the whiteflies and the American patches. The invasive alien species such as Liriomyza huidobrensis, Liriomyza huidobrensis, and Western flower thrips are extremely awkward and difficult to eradicate. These insects are widely distributed and have a large number. Apart from sucking plant sap, plundering nutrients, affecting the normal growth of vegetables, leaf yellowing, dryness, and fruit deformities, they also secrete honeydew to cause coal pollution, spread viral diseases, and affect vegetable yield and quality. . First, the cause of the occurrence of larvae have many aspects of the impact, from the pest itself, the changes in the environment and human factors. 1. Changes in the microclimate. In greenhouses and greenhouses, high summer temperatures are suitable for sucking pests to feed on supplementary nutrients and moisture; winter warming guarantees that wintering pests accumulate populations. 2. Individual pests are easy to hide. A blade can feed dozens of heads or even hundreds of worms, and can meet rations without having to transfer them. Such as a melon on a leaf enough for hundreds of heads, and even more than a thousand of whitefly feeding. It is easy to hide, as Liriomyza submergence into the mesophyll tissue, spraying, smoking can not work. 3, strong reproductive ability. There are more than a dozen generations in a year, and there are more than a dozen generations. Eggs, larvae, adults, and young and old are living together. Some live in isolation, such as locusts. Once a winged one has landed, dozens of “paratroopers†appear. Ten days later, the leaves were covered with hundreds of locusts. 4, strong environmental adaptability. These insects like to fly and move quickly, and most of them have body-protection wax layers, leather texture or netting, such as whiteflies and ticks, which increase the difficulty of prevention and control. 5, proliferation of diverse ways. These pests may fly well, or spread with the wind, or spread out with the seedlings. Liriomyza sativae, Bemisia tabaci, and western flower thrips in the south of the country are no longer unusual at home and in the north. 6, changes in cultivation system. Four seasons cultivation of vegetables, intercropping rotation, provides enough food, wintering places, throughout the year to eat, live, do not worry about the line. Second, prevention and control measures Against the current occurrence of six worms in vegetables, take "prevention-based, comprehensive prevention and control", and a number of prevention and control measures to support the live nursery off, production off, to achieve the production of vegetables without pollution. 1, agricultural control. 1 To nurture strong seedlings, it is forbidden to transplant insect seedlings from seedling houses into production greenhouses and greenhouses. 2 Arrangements should be reasonable and as soon as possible. It is possible to plant 1 to 2 lines of pest-loving plants in Shantou and Mangzi and concentrate on medications; or plant several kinds of plants with odor and shape that are not like, and drive the insects out of the shed. 3 sowing in advance or postponed, reasonable fertilization, irrigation, timely cultivation and weeding, combined with pruning, snoring to eliminate part of the insect source. 4 Do a good job in field sanitation during the winter, remove the dead leaves and leaves, reduce the pests habitat, shelter and wintering sites. 2, physical and mechanical control. 1 drive trapping: yellow plates can kill aphids, whiteflies, spotted lilies, etc. Silver gray film can repel aphids. 2 Manually or using simple devices to kill, such as manual removal of leaves with locusts, leaf miners, whitefly, etc. 3 Put pest control gauze nets in entrances and vents of greenhouses, greenhouses, etc., and control the relocation of greenhouse mealworms, whitefly, spotted fly, and locusts. 3, chemical control. 1 timely medication: do a good job on the basis of monitoring, timely medication, the pests in the bud to eliminate, such as the prevention and treatment of locusts before leaf rolling, leaf litho before the prevention and treatment, the formation of wax powder before the prevention of cotton magpies and so on. 2 The pesticide species should be on the road and pay attention to rotation. For the control of six bugs, these agents are preferred: pyrethroids, imidacloprid, acetamiprid, and avermectins. For a variety of small pests should be "two-turn a deduction, four-side penetration," to prevent the net off debris, adding the right amount of synergist better. 3 joint defense joint governance. It is best to use joint prevention and control by neighboring farmers, so that pests can no longer hide and hide. 4, biological control. Should pay attention to the natural predators grasshoppers, ladybugs protection, conditions can also buy natural enemies, vegetable shed release èšœ èšœ 〠〠桨 桨 桨 桨 桨 桨 桨 èšœ èšœ èšœ èšœ èšœ 桨 ç‰ è™± è™± è™± è™± è™± è™± è™± effect is better, and no longer suffer The hot days of carrying the sprayer's labor, but also away from contact poisoning.
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