防蟲(chóng)網(wǎng)的形狀像紗窗。具有較高的抗拉強(qiáng)度、抗紫外線、耐熱、耐水、耐腐蝕、耐老化。無(wú)毒無(wú)味。其使用壽命一般為4-6年，最長(zhǎng)可達(dá)10年。它既有遮陽(yáng)網(wǎng)的優(yōu)點(diǎn)，又克服了遮陽(yáng)網(wǎng)的缺點(diǎn)，值得推廣。
1、蚊帳的作用
1防凍
果樹(shù)幼果期和果實(shí)成熟期處于低溫季節(jié)，容易引起冷害或凍害。結(jié)果表明，防蟲(chóng)網(wǎng)的應(yīng)用不僅提高了網(wǎng)內(nèi)溫度和濕度，而且防止了果實(shí)表面凍害，對(duì)防止枇杷幼果期凍害和柑桔成熟期凍害有非常明顯的效果。
2病蟲(chóng)害防治
果園、苗圃覆蓋防蟲(chóng)網(wǎng)后，阻斷蚜蟲(chóng)、木虱、夜蛾、果蠅等果樹(shù)害蟲(chóng)的發(fā)生和傳播途徑，達(dá)到防治這些害蟲(chóng)的目的，特別是控制蚜蟲(chóng)、木虱等媒介昆蟲(chóng)的危害，對(duì)防治柑桔黃龍病、衰退病等病害的蔓延，對(duì)控制火龍果、火龍果等藍(lán)莓和果蠅具有重要作用。
三。防落果
果實(shí)成熟期在夏季，雨水充沛。如采用防蟲(chóng)網(wǎng)，可減少果實(shí)成熟期暴雨造成的落果，特別是在雨年火龍果、藍(lán)莓、楊梅等水果處于雨季時(shí)。
4改善溫度和光線
覆蓋防蟲(chóng)網(wǎng)可以降低光照強(qiáng)度，調(diào)節(jié)土壤溫度和空氣溫濕度，減少降水、水分蒸發(fā)和葉片蒸騰。結(jié)果表明，空氣相對(duì)濕度高于對(duì)照，雨天濕度最高，但差異最小，增幅最小。當(dāng)網(wǎng)室相對(duì)濕度增加時(shí)，柑橘類果樹(shù)的蒸騰作用會(huì)降低。降水和相對(duì)濕度對(duì)果實(shí)生長(zhǎng)發(fā)育的影響較大。
果樹(shù)防蟲(chóng)網(wǎng)覆蓋方法：
?。?）棚型：先搭棚，用槽口固定腳手架，用防蟲(chóng)網(wǎng)覆蓋腳手架，用水泥夯實(shí)地面，棚前留門(mén)。
（2）覆蓋方式：直接用防蟲(chóng)網(wǎng)覆蓋果樹(shù)，用竹竿支撐。它可以同時(shí)覆蓋一棵樹(shù)或多棵樹(shù)。該方法操作簡(jiǎn)單，費(fèi)用低，但會(huì)給現(xiàn)場(chǎng)操作和管理帶來(lái)不便。主要適用于短期、季節(jié)性防霜凍、防暴雨、防鳥(niǎo)害等，成熟期可防霜凍、果蠅、鳥(niǎo)害。
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、The function of insect net
1.Frost prevention
The young fruit stage and fruit maturity stage of fruit trees are in the low temperature season,which is easy to cause chilling injury or freezing injury.The results showed that the application of insect proof net not only improved the temperature and humidity in the net,but also prevented the frost injury on the fruit surface by using the insect proof net,which had a very obvious effect on the prevention of frost damage in the young fruit stage of loquat and the cold injury in the mature stage of citrus fruit.
2.Pest control
After the orchard and nursery are covered with insect proof nets,the occurrence and transmission routes of aphids,Psylla,Spodoptera,fruit flies and other fruit pests are blocked,so as to achieve the purpose of controlling these pests,especially to control the damage of aphids,wood lice and other vector insects,to prevent and control the spread of Citrus Huanglongbing disease,recession disease and other diseases,and to control pitaya,pitaya,etc Blueberry and Drosophila play an important role.
3.Fruit drop prevention
The fruit ripening period is in the summer with heavy rain.If the insect proof net is used,it can reduce the fruit drop caused by rainstorm during the fruit ripening period,especially in the rainy years when pitaya,blueberry and bayberry fruit are in the rainy year.
4.Improve temperature and light
Covering insect proof net can reduce light intensity,adjust soil temperature and air temperature and humidity,reduce precipitation,water evaporation and transpiration of leaves.The results showed that the relative humidity of air was higher than that of the control,and the humidity in rainy days was the highest,but the difference was the smallest,and the increase rate was the lowest.When the relative humidity in the net room was increased,the transpiration of fruit trees like citrus leaves could be reduced.Water affected fruit quality development through precipitation and air relative humidity,which was more conducive to fruit growth and development,and the fruit quality was better.
Methods of covering fruit trees with insect proof net:
(1)Shed type:first build the shed,fasten the scaffolds with slots,cover the scaffolds with insect proof net,compact the ground with cement,and leave a door on the front of the shed.
(2)Cover type:directly cover the fruit trees with insect prevention net and support with bamboo pole.It can cover single tree or multiple trees at the same time.It is easy to operate and reduce expenses,but it will cause inconvenience in field operation and management.It is mainly suitable for short-term,seasonal frost prevention,rainstorm prevention,bird damage prevention,etc.if it is in mature stage,it can prevent frost,fruit fly and bird damage.
