防虫网覆盖法
漂浮覆盖不仅能有效地防止斜纹夜蛾和甜菜夜蛾的为害，而且能有效地防止风暴，减少叶片的伤害。
采用小棚盖是现在实施较多的遮盖方法。小棚的形状随边界的宽度而变化。它可以做成小平房或小拱形棚。该方法投资少，易于实施，可从棚外洒水。
温室里盖着大棚，全封闭，盖上防虫网，蔬菜在里面种植。从种植到收获，蚊帐没有被移除，杀虫剂也没有或更少被喷洒。操作也很方便。
如何使用防虫网
覆盖前应进行土壤消毒和化学除草，这是防虫网栽培的重要配套措施。必须杀灭残留在土壤中的细菌和害虫，阻断害虫的传播途径。用小拱棚覆盖栽培蔬菜时，拱棚的高度应高于蔬菜的高度，以防止树叶粘在防虫网上，使网外害虫吃了叶，在叶上产卵。随时检查防虫网的破损情况，及时堵塞漏洞和缝隙。
没有必要通过覆盖整个生长期来覆盖整个生长期。一般在5-6级大风时，不必按线，以免被风卷起。
根据蔬菜种类和栽培季节，选择网的宽度、直径、直径和颜色。同时，最重要的是光圈。如果网目过小，网目过大，网目小，防虫效果好，但遮光过多，不利于蔬菜生长。一般来说，30目比较合适。
当空气温度较高时，网内温度高于网外温度。因此，7～8月气温特别高时，可增加浇水次数，以湿降温。
Covering method of insect proof net
Floating surface covering can not only effectively prevent the damage of Spodoptera litura and beet armyworm,but also prevent the storm and reduce the damage of leaves.
The use of small shed cover is now the implementation of the application of more cover up methods.The shape of the small shed varies with the width of the border.It can be made into a small flat shed or a small arched shed.This method has less investment and is easy to carry out,and can spray water from outside the shed.
The greenhouses are covered with greenhouses,all closed and covered with insect proof nets,and vegetables are cultivated in them.From planting to harvesting,the nets are not removed,and no or less pesticides are sprayed.The operation is also convenient.
How to use insect proof net
Soil disinfection and chemical weeding should be carried out before covering up,which is an important supporting measure for the cultivation of insect control nets.It is necessary to kill the bacteria and pests remaining in the soil and block the transmission path of pests.The height of the arch shed should be higher than the height of the vegetable when the small arched shed is used to cover the cultivated vegetables,so as to prevent the leaves from clinging to the insect proof net,so that the pests outside the net can eat the leaves and lay eggs on the leaves.Check the damage status of the insect proof net at any time and plug the loopholes and gaps in time.
It is not necessary to cover the whole growth period by covering the whole growth period.In general,it is not necessary to press the line in case of 5-6 strong wind,so as to avoid being lifted by the wind.
According to the type of vegetables and cultivation season,the width,diameter,diameter and color of the net should be selected.In the meantime,the most important is the aperture.If the mesh size is too small,the mesh size is too large and the mesh size is small,the pest control effect is good,but the shading is too much,which is bad for the growth of vegetables.Generally,30 mesh is more suitable.
When the air temperature is high,the temperature inside the net is higher than that outside the net.Therefore,when the temperature is particularly high from July to August,the frequency of watering can be increased to cool the temperature by wet.
