The role of insect net
1. Pest control: After the vegetables are covered with insect-proof nets, they can basically avoid the damage of various pests such as cabbage caterpillar, diamondback moth, cabbage armyworm, litura litura, flea beetle, ape leaf beetle, and aphids. According to the test, the insect-proof net has a control effect of 94-97% on cabbage caterpillar, diamondback moth, cowpea pod borer and Liriomyza americanum, and 90% on aphids.
2. Disease prevention: viral diseases are catastrophic diseases on a variety of vegetables, mainly transmitted by insects, especially aphids. Since the insect-proof net cuts off the main virus transmission route of pests, it greatly reduces the infection of vegetable viruses, and the control effect is about 80%.
3. Adjust the air temperature, soil temperature and humidity: Tests show that: in hot July-August, in the 25-mesh white insect-proof net, the temperature in the morning and evening is the same as that in the open field, and it is about 1 ºC lower than that in the open field at noon on sunny days. From March to April in early spring, the temperature inside the shed covered by insect nets is 1-2°C higher than that of the open field, and the temperature of the 5 cm ground is 0.5-1°C higher than that of the open field, which can effectively prevent frost. When the insect-proof net room encounters rain, the precipitation in the net room can be reduced, and the evaporation in the net room can be reduced on sunny days.
4. Shading strong light: In summer, the light intensity is high, and strong light will inhibit the vegetative growth of vegetable crops, especially leafy vegetables, while the insect-proof net can play a certain role in shading and preventing direct strong light. 20-22 mesh silver-gray insect-proof The general shading rate of the net is 20-25%.
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