In agricultural production, in addition to blocking pests into the shed, the insect net can also regulate temperature, soil temperature and humidity. What should we pay attention to when using the greenhouse insect net? How can we make the insect net work well? Let’s take a look!
The role of insect nets
1, can effectively prevent insects. After the agricultural products cover the insect-repellent net, it can effectively eliminate many pests such as cabbage caterpillar, diamondback moth, cabbage night moth, Spodoptera litura, yellow-curved beetle, locust leafhopper, and aphid.
2. Adjust the temperature, humidity and soil temperature in the shed. In the early spring of March-April, the insect-proof net covered the shed is 1-2 °C higher than the exposed ground, and the 5 cm temperature is 0.5-1 °C higher than the open ground, which can effectively prevent frost.
In the hot season, the greenhouse was covered with a white insect net. The test showed that in the hot July-August, in the 25-mesh white insect net, the morning and evening temperatures were the same as the open, while the sunny noon was about 1 °C lower than the open ground.
In addition, the insect-proof net can block part of the rainwater from falling into the shed, reduce the humidity in the field, reduce the incidence, and reduce the amount of water evaporation in the greenhouse.
3. Block foreign objects into the shed. The insect net can also be placed under the tuyere to block foreign objects from entering the shed, such as cutting grass.
4. Effectively prevent cracking. After the fruit has split and the top vent is opened, the cold wind is directly related to the fruit surface. Therefore, the insect-proof net is installed at the air outlet of the low-temperature season, and the dense mesh can be used to break up the cold air and reduce the strength of the cold wind, without affecting the normal ventilation of the greenhouse. By using the insect net and the windshield at the bottom of the air outlet, it is possible to effectively prevent fruit splitting and blade damage caused by cold wind.
5, there is a shading effect. In summer, the light intensity is large, and strong light will inhibit the vegetative growth of vegetables, especially leafy vegetables, while the insect net can play a certain shading effect. The 20-22 mesh silver-gray insect net has a general shading rate of 20-25%.
How to choose insect net
1. In the selection of greenhouse insect nets, the mesh number, color and width of the gauze should be considered.
If the mesh is too small and the mesh is too large, it will not have the anti-insect effect; if the mesh is too much, the mesh is too small, although it can prevent insects, but the ventilation is poor, resulting in high temperature and excessive shading, which is not conducive to Crop growth.
For example, many pests in the fall began to move into the shed, especially some moths and butterfly pests. These pests are larger in size, and vegetable farmers can use insect nets with relatively few meshes, such as 30-60 mesh insect nets.
However, for more weeds outside the shed, and more white mites, it should be prevented from entering the pores of the insect-proof net according to the smaller size of the mites. It is recommended that the vegetable farmers use a dense insect-proof net, such as 40-60 mesh.
For example, the most critical aspect of the control of tomato yellow leaf curl virus (TY) is the selection of a qualified insect-resistant nylon gauze. Under normal circumstances, the nylon gauze of the anti-smoke powder is 40 mesh. Excessive ventilation is not good, and it is difficult to cool down at night in the shed after planting. However, at present, the gauze mesh produced by the gauze market is rectangular, and the narrow mesh of the 40 mesh gauze can reach more than 30 mesh, and the wide side often has only 20 mesh, which does not meet the requirements for blocking the beech. Therefore, only 50-60 mesh gauze can be used to block the whitefly.
In spring and autumn, the temperature is lower and the light is weaker. It is better to use a white insect net. In the summer, in order to balance the sunshade and cool down, a black or silver-gray insect net should be used. In areas where aphids and viral diseases are severe, in order to repel aphids and prevent viral diseases, silver-gray insect-proof nets should be used.
2. When using the insect-proof net, pay attention to check whether the insect-proof net is complete.
Some vegetable farmers have reported that many insect-repellent nets that have just been bought have broken pores. Therefore, farmers are reminded that the insect-repellent net should be unfolded when purchasing, and whether the insect-repellent net has broken holes.
Insect net installation
1. Ensure coverage quality. The insect-proof net should be fully enclosed, the soil pressure should be tight around the perimeter, and it should be fixed firmly with the laminating line; the doors that enter and exit the large, medium and greenhouse should be taken care of immediately after entering and exiting. The small arch shed is covered with insect-proof nets, and the height of the scaffolding is obviously higher than that of the crops, so as to prevent the leaves from sticking to the insect-proof nets, so as to prevent the pests from feeding or spawning on the leaves.
For example, when controlling TY, the tomato should be protected by an insect net during the whole planting period. The upper and lower vents of the shed, the vents of the rear wall, and the two entrances and exits are sealed with insect nets. Especially in the two doors of the operation room, the curtains must be played back in time when people enter and exit.
The insect-proof net used for the air vent closing is not allowed to have a gap between the transparent covering and the transparent covering to prevent the insects from leaving the access passage. Check and repair holes and gaps on the insect net at any time.
2, pest control. Seeds, soils, plastic sheds or greenhouse skeletons, racks, etc. may carry pests and eggs. Before covering the insect-proof net to planting vegetables, it is necessary to dispel the seeds, soil, shed skeleton and frame material, which is the key link to ensure the cultivation effect of the insect-proof net.
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