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Insect-proof net is like window screen, with high tensile strength, UV resistance, heat resistance, water resistance, corrosion resistance, aging resistance and other properties, non-toxic and tasteless, the service life is generally 4-6 years, up to 10 years. It not only has the advantages of shading nets, but also overcomes the shortcomings of shading nets, and it is worthy of vigorous promotion.
First, the role of insect nets
1. Anti-frost
The young fruit period and the fruit maturity period of fruit trees are in the low temperature season, which is easy to cause cold damage or freezing damage. The use of insect-proof net covering is not only conducive to improving the temperature and humidity in the net, but also uses the isolation of the insect-proof net to prevent frost damage on the fruit surface.
2, pest control
After the orchards and nurseries are covered with insect-proof nets, the occurrence and transmission of various fruit pests such as aphids, psyllids, fruit sucking moths, heartworms, fruit flies and other fruit pests are blocked, so as to achieve the purpose of preventing and controlling these pests, especially the control of aphids. It plays an important role in preventing and controlling the spread of diseases such as citrus Huanglongbing and recession diseases, as well as the control of dragon fruit and blueberry fruit flies.
3. Fruit drop prevention
The ripening period of the fruit is in the rainy weather in summer. If the insect-proof net is used to cover it, it will reduce the fruit drop caused by the rainstorm during the ripening period of the fruit, especially in the years when the fruit of dragon fruit, blueberry and bayberry experience heavy rain during the ripening period, and the effect of reducing the fruit drop is more obvious .
4. Improve temperature and light
Covering the insect-proof net can reduce the light intensity, adjust the soil temperature and air temperature and humidity, and at the same time, it can reduce the precipitation in the net room, reduce the water evaporation in the net room, and reduce the transpiration of the leaves. After the insect net was covered, the relative humidity of the air was higher than that of the control, among which the humidity was the highest in rainy days, but the difference was the smallest and the increase was the lowest. After the relative humidity in the net room is increased, the transpiration of fruit trees like citrus leaves can be reduced. Water affects fruit quality development through precipitation and relative air humidity, and when it is more conducive to fruit growth and development, fruit quality is good.
Covering method of insect-proof net on fruit trees:
(1) Shed type: First, build the scaffolding, fasten the scaffolding with card slots, cover the scaffolding with insect-proof nets, compact the ground with cement, etc., and leave a door on the front of the greenhouse.
(2) Cover type: directly cover the insect-proof net on the fruit tree and support it with bamboo poles. It can cover a single plant or multiple plants at the same time. It is easy to operate and reduces expenses, but it will cause inconvenience in field operation and management. It is mainly suitable for short-term, seasonal Anti-frost, anti-rainstorm, anti-bird damage, etc., if the fruit is mature, anti-frost and anti-fruit flies and bird damage, etc.

2. Scope of application
①Cultivation of leafy vegetables covered with insect-proof nets Leafy vegetables are a favorite vegetable for urban and rural residents in summer and autumn. Remind you to use insect net to cover cultivation can greatly reduce pesticide pollution.
②Cultivation of fruits and melons covered with insect-proof nets Virus diseases are prone to occur in melons and fruits in summer and autumn. After the application of insect-proof nets, the transmission route of aphids is cut off and the harm of virus diseases is reduced.
③Cultivation of seedlings Every year from June to August, it is the season of growing vegetables in autumn and winter, and it is also a period of high humidity, heavy rain and frequent insect pests, so it is difficult to raise seedlings. After using the insect-proof net, the vegetable seedling rate is high, the seedling rate is high, and the quality of the seedlings is good, so as to win the initiative of autumn and winter crop production.

3. Key points of use
The use of insect nets is relatively simple, but the following points should be noted.
①It must be covered with insect-proof nets for shading all the time. However, there is not much shading, so there is no need to cover day and night or cover the front and back. Full coverage should be made. Both sides are compacted with bricks or earth. A satisfactory pest control effect can be achieved without giving the opportunity for pests to invade. Under normal wind conditions, the pressure network cable can be used. In case of 5-6 strong winds, you need to pull up the pressure network cable to prevent the strong wind from opening the net.
②Choose the appropriate specifications The specifications of the insect net mainly include width, aperture, color and so on. In particular, the aperture and the number of insect-proof meshes are too small, and the meshes are too large, which cannot achieve the proper insect-proof effect. Too many meshes and small meshes will increase the cost of insect-proof nets although they are insect-proof.
③Comprehensive supporting measures In addition to insect-proof net coverage, combined with comprehensive supporting measures such as pest-resistant varieties, heat-resistant varieties, pollution-free organic fertilizers, biological pesticides, pollution-free water sources, and micro-spraying and micro-irrigation, better results can be obtained.
④ Proper use and storage After the field use of the insect-proof net is over, it should be taken away in time, washed, dried and rolled to prolong its service life and increase economic benefits.
In the process of using the greenhouse insect net, we must pay attention to several details, so that we can have a good use effect in the process of use.
1. First of all, in the selection of insect-proof nets for greenhouses, the mesh number, color and width of the gauze should be considered. If the number of meshes is too small and the mesh is too large, it will not achieve the desired insect-proof effect; and if the number is too large and the mesh is too small, although it can prevent insects, the ventilation is poor, resulting in high temperature and excessive shading, which is not conducive to Crops grow. Generally, 22-24 mesh insect nets should be used. Compared with summer, in spring and autumn, the temperature is lower and the light is weak, so white insect-proof nets should be used; in summer, in order to take into account the shading and cooling, black or silver-gray insect-proof nets should be used; in areas with serious aphids and virus diseases, in order to avoid For aphids and virus disease prevention, silver-gray insect-proof nets should be used.
2. Ensure the quality of coverage The insect-proof net should be fully enclosed and covered, and the surrounding areas should be tightly pressed with soil and fixed firmly with lamination lines; the doors of entering and leaving the large and medium sheds and greenhouses must be installed with insect-proof nets, and pay attention to close them immediately when entering and leaving. Insect-proof nets cover cultivation in small arched sheds, and the height of the scaffolding should be significantly higher than that of the crops, so as to avoid the crop leaves from sticking to the insect-proof nets, so as to prevent pests from eating outside the nets or laying eggs on vegetable leaves. There should be no gaps between the insect-proof net used for closing the air vent and the transparent cover, so as not to leave an entry and exit channel for pests. Check and repair holes and gaps in the insect net at any time.
3. Pest control treatment Seeds, soil, plastic sheds or greenhouse skeletons, frame materials, etc. may contain pests and eggs. After the insect-proof net is covered and before the crops are planted, the seeds, soil, greenhouse skeleton, frame materials, etc. must be treated with insecticides. This is the key link to ensure the cultivation effect of the insect-proof net and prevent a large number of diseases and insect pests in the net room. serious damage.
4. Select the varieties suitable for planting in the net room, pay attention to the row spacing and plant spacing during the planting process, and plant them appropriately.
5. Fruit trees are covered with sunshade nets, the soil should be deeply ploughed, and the amount of base fertilizer applied such as well-rotted farmyard manure and compound fertilizer should be sufficient. During the growing period of crops, alternate flushing or drip irrigation per acre of Jiamei Dividend 1 bag + Jiamei Hailibao 2- 3 kg; 1 bag of Jiamei bonus + 1 bag of Jiamei Melatonin, spray 1000 times of Jiamei Melatonin on the foliage to enhance the plant’s ability to resist stress and pests.
6. The insect-proof net can keep warm and moisturizing. Therefore, when carrying out field management, pay attention to the temperature and humidity in the net room, and ventilate and dehumidify in time after watering to avoid diseases caused by excessive temperature and humidity.
Article source: Tianbao Agricultural Technology Service Platform