Insect net covering and cultivation is one of the important measures for producing pollution-free agricultural products. It is of great significance to eliminate or reduce the use of chemical pesticides, reduce pesticide pollution, and produce pesticide-free, pollution-free and pollution-free vegetables.

First, the form of coverage

Covering the greenhouse, the insect-proof net can be directly covered on the scaffold, surrounded by soil or brick pressure, and the laminar pipe (shelf) is fastened with a lamination line, leaving the main door uncovered for easy access to the shed.

Small arch cover, can be covered in the top of the arch shield network, surrounded by strict cover, after the water poured directly on the Internet, until harvest, the implementation of closed cover.

Covered with a horizontal shelf, the vegetable land of about 1hm2 is covered with insect nets. This covering method saves insect nets and net racks and is easy to operate.

Second, the effect of coverage

1) Adjust the temperature and ground temperature. According to the test, under the 25-mesh white insect-proof net, the temperature of the greenhouse is the same as the open field in the morning and evening. In the high-temperature conditions at noon on the sunny day, the temperature in the net is about 1°C higher than the exposed ground, and the ground temperature of the greenhouse is higher than the open ground in the morning and evening. It was lower than open ground at noon.

2) Shading and humidity control. The shading rate of the 25-mesh white insect net is 15%-25%, which is lower than the shading net and agricultural film. Silver gray insect nets are 37% and gray insect nets up to 45%. Covering insect nets, the morning air humidity is higher than open ground, and is lower than open ground at noon and evening. The relative humidity in the net is about 5% higher than the exposed ground and nearly 10% higher after watering, making it particularly suitable for cultivation in summer and autumn.

3) Anti-frost and antifreeze. In early spring from late March to early April, insect nets cover 1-2°C higher than the open air temperature in the shed, and the 5cm ground temperature is 0.5-1° higher than open ground, which can effectively prevent frost.

4) Anti-rainstorm, strong wind. Heavy rainstorms in the summer cause mechanical damage to vegetables, causing soil compaction and seedling emergence and dead seedlings. After covering the insect net, due to the small mesh and high strength, the heavy rain fell into the net after the impact of the insect net, becoming drizzle, and the impact was weakened, which was conducive to the growth of vegetables. It has been determined that under the 25-mesh insect net, the wind speed in the greenhouse is reduced by 15%-20% compared to the exposed land. Under 30 mesh, the wind speed is reduced by 20%-25%, so the insect net has better anti-wind effect.

5) pest control, anti-virus disease. After covering the insect nets, it is basically able to eliminate the cabbage caterpillar, diamondback moth, brassicae, beet armyworm, Spodoptera litura, cotton bollworm, leguminosae, melon, flea beetle, coleoptera, twenty The pests of eight-spot ladybugs, aphids, and Liriomyza sativae infestation are responsible for controlling the occurrence of viral diseases due to the spread of pests.

6) Increase production and income, improve quality. According to the test, the output of the 25-mesh white insect-proof net greenhouse is the highest, which can increase the production by about 30%; the pesticide pollution of the cabbage in the net is less, there is no insect eyes, cleanliness, and little mud, and the harvesting period is 4-5 days earlier than the open land, and the commodity is good.

7) Protect natural enemies. The living space formed by the Insect Protection Network provides an ideal habitat for the activities of natural enemies and will not allow natural enemies to escape to the outer space. This creates favorable conditions for the application and promotion of biological pest management technologies.

Third, the scope of application

1) Leaf vegetables. Mainly used for cabbage, summer cabbage, summer cabbage, spinach, lettuce, cauliflower, radish production. The openness of such vegetables produces more pests and serious pesticide pollution.

2) Solanaceae. Such vegetables are prone to viral diseases in the summer and fall seasons, and the insect nets stop pest transmission and reduce the transmission of viral diseases. Simultaneous isolation of the cotton bollworm, Spodoptera littoralis, 28 ladybugs, eggplant, etc., to reduce the rotten fruit.

3) Melons. Mainly used for melon, pumpkin, watermelon, etc., will help reduce the occurrence of viral diseases and the damage of Huang Shougua and Guagua.

4) Beans. The control effect of insect nets on soybean meal and Liriomyza sativae reaches more than 95%. It can also increase chlorophyll content, increase leaf area and enhance root activity.

5) Nursery. Every year from June to August is the season of growing vegetables in autumn. It is a time when high temperatures, heavy rain, and frequent pests occur. It is difficult to raise seedlings. After the use of insect nets, the emergence rate of vegetables is high, the survival rate is high, and the quality of autumn seedlings is good to win the initiative of autumn and winter vegetable production.

6) Vegetable seed production and breeding. Insect nets prevent the hybridization of breeds due to insect activity, resulting in mixed degradation of seeds. It can be widely used in the seed production of vegetables.

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