防虫网的形状像纱窗。具有较高的抗拉强度、抗紫外线、耐热、耐水、耐腐蚀、耐老化。无毒无味。其使用寿命一般为4-6年，最长可达10年。它既有遮阳网的优点，又克服了遮阳网的缺点，值得推广。
1、在温室内安装防虫网是必要的
1它能有效地防虫。该网覆盖后，可有效地防治菜粉蝶、小菜蛾、蚜虫等害虫。
农产品覆盖防虫网可有效避免菜青虫、小菜蛾、甘蓝粘虫、斜纹夜蛾、金龟子、叶甲虫、蚜虫等害虫的危害的试验结果，防虫网对甘蓝毛虫、小菜蛾、豇豆荚螟、美洲斑潜蝇的防治效果分别为94-97%和90%。
2它可以预防疾病。病毒传播会给温室种植带来灾难性后果，尤其是蚜虫传播。而温室内安装防虫网可以切断害虫的传播途径，大大降低病毒性疾病的发生率，防治效果在80%左右。
三。调节空气温度、土壤温度和湿度。在炎热的季节，温室里覆盖着白色的防虫网。试验表明，炎热季节7～8月，在25目白色防虫网中，早晚气温与露地相同，但中午比晴天露地低1℃左右。早春3～4月，覆盖防虫网的棚内气温比露地高1～2℃，5cm地温比露地高0.5～1℃，能有效地防止霜冻。另外，防虫网能防止部分雨水落入大棚，降低田间湿度，减少病害发生，减少晴天温室内水分蒸发。
4它有阴影效果。夏季光照强度高，强光会抑制蔬菜尤其是叶菜类蔬菜的生长，而防虫网能起到一定的遮光作用，20-22目银灰色防虫网一般有20-25%的遮光率。
2、选用防虫网应注意的几个问题
目前，不少菜农使用30目防虫网，部分菜农使用60目防虫网。同时，菜农使用的防虫网的颜色也包括黑色、棕色、白色、银色和蓝色，那么什么样的防虫网才适合呢？
The insect proof net is shaped like a window screen.It has high tensile strength,ultraviolet resistance,heat resistance,water resistance,corrosion resistance and aging resistance.It is non-toxic and tasteless.Its service life is generally 4-6 years,up to 10 years.It not only has the advantages of the sunshade net,but also overcomes the shortcomings of the sunshade net,so it is worth popularizing.
1、It is necessary to install insect proof net in greenhouse
1.It can effectively prevent insects.After covered with the net,the pests such as Pieris rapae,Plutella xylostella and aphids can be avoided.
Agricultural products covered with insect proof net can effectively avoid the damage of Pieris rapae,Plutella xylostella,cabbage armyworm,Spodoptera litura,scarab beetle,leaf beetle,aphid and other pests.According to the test of Tianbao agricultural technology service platform(ID:tianbaonj),the control effect of insect control net on cabbage caterpillar,diamondback moth,cowpea pod borer,Liriomyza sativae was 94-97%and 90%against aphids.
2.It can prevent disease.Virus transmission will bring disastrous consequences to greenhouse planting,especially aphid transmission.However,the installation of insect proof nets in greenhouse can cut off the transmission route of pests,greatly reducing the incidence rate of viral diseases,and the control effect is about 80%.
Focus on WeChat public number[Tianbao agricultural technology service platform]enter shopping mall or enter Taobao search shop[Jiamei]to purchase official account.
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3.Adjust air temperature,soil temperature and humidity.In the hot season,the greenhouse was covered with white insect proof net.The test showed that the temperature in the morning and evening was the same as that in the open field in the 25 mesh white insect proof net from July to August in the hot season,but it was about 1℃lower at noon than that in the open field on a sunny day.From March to April in early spring,the air temperature in the shed covered with insect proof net was 1-2℃higher than that in open field,and the ground temperature of 5cm was 0.5-1℃higher than that in open field,which could effectively prevent frost.In addition,the insect net can prevent some rainwater from falling into the shed,reduce the field humidity,reduce the incidence of disease,and reduce the water evaporation in the greenhouse on sunny days.
4.It has shading effect.The light intensity is high in summer,strong light will inhibit the growth of vegetables,especially leafy vegetables,and insect net can play a certain role in shading,20-22 mesh silver gray insect prevention net generally has a shading rate of 20-25%.
2、Several problems needing attention in selecting insect proof net
At present,many vegetable farmers use 30 mesh insect net,and some vegetable farmers use 60 mesh insect net.At the same time,the colors of insect proof nets used by vegetable farmers also include black,brown,white,silver and blue,so what kind of insect net is suitable?
