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Three precautions before and after china insect screen

  • Categories:NEWS
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  • Time of issue:2021-11-12 02:00
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(Summary description)Three precautions before and after china insect screen

Three precautions before and after china insect screen

(Summary description)Three precautions before and after china insect screen

  • Categories:NEWS
  • Author:
  • Origin:
  • Time of issue:2021-11-12 02:00
  • Views:
Information

Vegetable greenhouses have been developed for several years, but many problems have been found. Diseases and pests are a very troublesome thing. Therefore, it is very necessary to install insect prevention nets. With its existence, it can effectively prevent pests. After covering the insect prevention net, it can basically avoid a variety of pests such as cabbage caterpillar, diamondback moth and aphid. It also has certain disease prevention. If you don't pay attention, the virus transmission will bring disastrous consequences, especially aphid transmission, which is very harmful. The installation of china insect screen in vegetable greenhouse cuts off the transmission path of pests and reduces the incidence of virus to a certain extent. In addition, it can adjust the temperature, soil temperature and humidity. In the spring and autumn, it can be covered with white china insect screen, which can achieve good thermal insulation effect and effectively reduce the impact of frost. In summer, black and silver gray insect prevention nets are generally used, taking into account the role of shading and cooling. In addition, the insect proof net can prevent some rainwater from falling into the shed, which will reduce the field humidity and reduce the water evaporation in the vegetable shed in sunny days. Finally, the shading effect is also good. Strong light will inhibit the normal growth of vegetables, especially leafy vegetables, and the china insect screen can play a certain shading and role.

In the process of using the greenhouse china insect screen, we must pay attention to several precautions, so that we can have a good use effect in the process of use. So, what problems should we pay attention to? Let's introduce it to you.

1. First of all, in the selection of china insect screen in greenhouse, the mesh number, color and width of yarn net should be considered. If the mesh is too small and the mesh is too large, the insect control effect will not be achieved; Moreover, if the number is too large and the mesh is too small, it can prevent insects, but poor ventilation leads to high temperature and too much shading, which is not conducive to crop growth. Generally, 22-24 mesh insect prevention net should be selected. In spring and autumn, compared with summer, the temperature is lower and the light is weaker, so white china insect screen should be selected; In summer, in order to give consideration to shading and cooling, black or silver gray insect prevention net should be selected; In areas where aphids and virus diseases are serious, silver gray insect control net should be selected in order to drive away aphids and prevent virus diseases.

2. To ensure the coverage quality, china insect screen shall be completely closed and covered, the surrounding shall be compacted with earth, and fixed firmly with film pressing line; China insect screen must be installed at the doors of large, medium and greenhouse, and attention shall be paid to closing them immediately when entering and leaving. The height of the shed shall be significantly higher than that of the crops to prevent the vegetable leaves from clinging to the insect screen, so as to prevent pests from feeding or laying eggs on the vegetable leaves outside the net.

There shall be no gap between the insect screen used to close the vent and the transparent cover, so as not to leave an access for pests. Check and repair the holes and gaps in the insect proof net at any time.

3. Pest control seeds, soil, plastic shed or greenhouse skeleton and frame materials may carry pests and eggs. After covering with china insect screen and before planting vegetables, the seeds, soil, shed framework and frame materials must be treated with insect control, which is the key link to ensure the cultivation effect of insect screen.

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