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(lán)粘蟲、斜紋夜蛾、金龜子、葉甲蟲、蚜蟲等害蟲的危害。試驗(yàn)表明，該網(wǎng)對(duì)甘藍(lán)毛蟲、小菜蛾、豇豆螟和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(huì)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(yàn)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(qiáng)度大，強(qiáng)光會(huì)抑制蔬菜尤其是葉類蔬菜的生長(zhǎng)。防蟲網(wǎng)能起到一定的遮光作用。20-22目銀灰色防蟲網(wǎng)遮光率20-25%
It can prevent insects effectively.The net can effectively control Pieris rapae,Plutella xylostella,aphids and other pests.Agricultural products covered with insect proof net can effectively avoid the harm of Pieris rapae,Plutella xylostella,cabbage armyworm,Spodoptera litura,scarab,leaf beetle,aphid and other pests.The results showed that the control effects of the net on cabbage caterpillar,Plutella xylostella,cowpea borer and Liriomyza sativae were 94-97%and 90%respectively
It can prevent diseases.Virus transmission will bring disastrous consequences to greenhouse planting,especially aphids.However,the installation of insect prevention net in the greenhouse can cut off the transmission path of pests,greatly reduce the incidence of viral diseases,and the control effect is about 80%.
3.Humidity and temperature of soil.In the hot season,the greenhouse is covered with white insect net.The results showed that in the hot season from July to August,the temperature in the morning and evening was the same as that in the open field,but it was about 1℃lower at noon than that in the open field on sunny days.From March to April in early spring,the 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 proof net can prevent part of rainwater from falling into the greenhouse,reduce the field humidity,reduce the occurrence of diseases,and reduce the water evaporation in the greenhouse on sunny days.
It has a shadow effect.In summer,the light intensity is high,strong light will inhibit the growth of vegetables,especially leafy vegetables.The insect proof net can play a certain role in shading.20-22 mesh silver gray insect proof net,shading rate 20-25%
