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大棚防虫网的防病防虫作用体现在哪?
网址:https://www.shengjiewangye.com    发布时间:2020-05-20
1.防虫:蔬菜覆盖防虫网后,基本上可免除菜青虫、小菜蛾、甘蓝夜蛾、斜纹夜蛾、黄曲跳甲、猿叶虫、蚜虫等多种害虫的为害。据试验,防虫网对白菜菜青虫、小菜蛾、豇豆荚螟、美洲斑潜蝇防效为94--97%,对蚜虫防效为90%。
1. Pest control: after the vegetable is covered with a pest control net, it can basically avoid the damage of a variety of pests, such as cabbage worm, Plutella xylostella, cabbage armyworm, Spodoptera litura, yellow flea beetle, simian leaf worm, aphid, etc. According to the experiment, the control effect of insect control net on cabbage cabbage, Plutella xylostella, cowpea pod borer and Liriomyza sativa is 94-97%, and the control effect on aphid is 90%.
2.防病:病毒病是多种蔬菜上的灾难性病害,主要是由昆虫特别是蚜虫传病。由于防虫网切断了害虫这一主要传毒途径,因此,大大减轻蔬菜病毒的侵染,防效为80%左右。
2. Disease prevention: virus disease is a disastrous disease on many kinds of vegetables, mainly transmitted by insects, especially aphids. Because the insect control net cut off the main way of insect transmission, the infection of vegetable virus was greatly reduced, and the control effect was about 80%.
3.调节气温、土温和湿度: 试验表明:炎热的7-8月,在25目白色防虫网中,早晨和傍晚的气温与露地持平,而晴天中午比露地低1℃左右。早春3-4月,防虫网覆盖棚内比露地气温高1-2℃,5厘米地温比露地高0.5-1℃,能有效地防止霜冻。 防虫网室遇雨可减少网室内的降水量,晴天能降低网室内的蒸发量。
果树防虫网
3. Adjust the temperature, soil temperature and humidity: the test shows that in the hot July August, in the 25 mesh white insect control net, the temperature in the morning and evening is the same as that in the open ground, while in the sunny day at noon, it is about 1 ℃ lower than that in the open ground. From March to April in early spring, the air temperature in the shelter covered with insect net is 1-2 ℃ higher than that in the open ground, and the ground temperature of 5cm is 0.5-1 ℃ higher than that in the open ground, which can effectively prevent frost. In case of rain, the precipitation in the net chamber can be reduced and the evaporation in the net chamber can be reduced in sunny days.
4.遮强光:夏季光照强度大,强光会抑制蔬菜作物营养生长,特别是叶菜类蔬菜,有防虫网可起到一定的遮光和防强光直射作用,20-22目银灰色防虫网一般遮光率在20-购买防虫网时应注意孔径。蔬菜生产上以20-32目为宜。
4. Strong light: in summer, the intensity of light is strong, and strong light will inhibit the growth of vegetable crops, especially leafy vegetables. Insect screen can play a role in shading and preventing strong light from direct. Generally, 20-22 mesh silver gray insect screen should pay attention to the aperture when purchasing insect screen. 20-32 mesh is suitable for vegetable production.
本文的精彩内容由果树防虫网提供知识提供,本网站还有很多的精彩内容,更多的内容您可以点击进入:https://www.shengjiewangye.com我们有专门的客服为您解答问题
The wonderful content of this article is provided by the fruit tree insect prevention network. There are many wonderful contents in this website. For more contents, you can click to enter: https://www.shengjiewangye.com We have special customer service to answer your questions
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