防蟲網(wǎng)的形狀像紗窗。具有較高的抗拉強度、抗紫外線、耐熱、耐水、耐腐蝕、耐老化。無毒無味。其使用壽命一般為4-6年，最長可達10年。它既有遮陽網(wǎng)的優(yōu)點，又克服了遮陽網(wǎng)的缺點，值得推廣。
1、在溫室內(nèi)安裝防蟲網(wǎng)是必要的
1它能有效地防蟲。該網(wǎng)覆蓋后，可有效地防治菜粉蝶、小菜蛾、蚜蟲等害蟲。
農(nóng)產(chǎn)品覆蓋防蟲網(wǎng)可有效避免菜青蟲、小菜蛾、甘藍粘蟲、斜紋夜蛾、金龜子、葉甲蟲、蚜蟲等害蟲的危害的試驗結(jié)果，防蟲網(wǎng)對甘藍毛蟲、小菜蛾、豇豆莢螟、美洲斑潛蠅的防治效果分別為94-97%和90%。
2它可以預(yù)防疾病。病毒傳播會給溫室種植帶來災(zāi)難性后果，尤其是蚜蟲傳播。而溫室內(nèi)安裝防蟲網(wǎng)可以切斷害蟲的傳播途徑，大大降低病毒性疾病的發(fā)生率，防治效果在80%左右。
三。調(diào)節(jié)空氣溫度、土壤溫度和濕度。在炎熱的季節(jié)，溫室里覆蓋著白色的防蟲網(wǎng)。試驗表明，炎熱季節(jié)7～8月，在25目白色防蟲網(wǎng)中，早晚氣溫與露地相同，但中午比晴天露地低1℃左右。早春3～4月，覆蓋防蟲網(wǎng)的棚內(nèi)氣溫比露地高1～2℃，5cm地溫比露地高0.5～1℃，能有效地防止霜凍。另外，防蟲網(wǎng)能防止部分雨水落入大棚，降低田間濕度，減少病害發(fā)生，減少晴天溫室內(nèi)水分蒸發(fā)。
4它有陰影效果。夏季光照強度高，強光會抑制蔬菜尤其是葉菜類蔬菜的生長，而防蟲網(wǎng)能起到一定的遮光作用，20-22目銀灰色防蟲網(wǎng)一般有20-25%的遮光率。
2、選用防蟲網(wǎng)應(yīng)注意的幾個問題
目前，不少菜農(nóng)使用30目防蟲網(wǎng)，部分菜農(nóng)使用60目防蟲網(wǎng)。同時，菜農(nóng)使用的防蟲網(wǎng)的顏色也包括黑色、棕色、白色、銀色和藍色，那么什么樣的防蟲網(wǎng)才適合呢？
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?
