1. It can effectively prevent insects. After the greenhouse cover with insect netting, it can basically avoid the cabbage caterpillar, Plutella xylostella, aphids and other pests.
Insect net for agriculture can effectively avoid the damage of cabbage caterpillar, Plutella xylostella, cabbage armyworm, Spodoptera litura, Phyllotreta striolata, ape Leafworm, aphid and other pests. According to the test, the control effect of the anti insect net on cabbage caterpillar, diamondback moth, cowpea pod borer and Liriomyza sativae was 94-97%, and the control effect on aphid was 90%.
2. It can prevent disease. Virus transmission will bring disastrous consequences to greenhouse planting, especially aphid transmission. However, the installation of anti insect net mesh in greenhouse can cut off the transmission route of pests, greatly reducing the incidence rate of viral diseases, and the control effect is about 80%.
3. Adjust air temperature, soil temperature and humidity. In the hot season, the greenhouse was covered with white insect protection net. The results showed that the temperature in the morning and evening of 25 mesh white insect net greenhous mesh was the same as that in the open field, but it was about 1 ℃ lower than that in the open field on sunny day at noon. From March to April in early spring, the air temperature in the greenhouse netting is 1-2 ℃ higher than that in the open field, and the ground temperature of 5cm is 0.5-1 ℃ higher than that in the open field, which can effectively prevent frost. In addition, the insect proof net can prevent some rainwater from falling into the shed, reduce the field humidity, reduce the incidence of disease, and reduce the water evaporation in the greenhouse on sunny days.
4. It has shading effect. In summer, the light intensity is high, the strong light will inhibit the vegetative growth of vegetables, especially leafy vegetables, and the insect net can play a certain role in shading. The shading rate of 20-22 mesh silver gray insect screen is generally 20-25%.