30 mesh or 60 mesh? Silver or black? Use mosquito nets well and pay attention to more!
Similar to the window screen insect net, high tensile strength, anti-ultraviolet rays, heat resistance, water resistance, corrosion resistance, aging resistance, non-toxic and odorless, the service life is generally 4-6 years, the longest up to 10 years. The system combines the advantages of the shade net, while overcoming the shortcomings of the shade net, which is worth vigorously promoting.
<h1 class="pgc-h-arrow-right" data-track="55" > First, it is very necessary to install insect nets in greenhouses, which have four functions:</h1>
1. Effective control of pests.
After covering the insect net, it can basically eliminate a variety of pests such as vegetable green insects, small cabbage moths, aphids and so on.
When agricultural products are covered by insect nets, many pests can be protected from the harm of cabbage insects, small cabbage moths, cabbage moths, ape leaf insects, aphids and so on. The anti-insect net has a control effect of 94-97% and 90% on cabbage green worms, cabbage moths, cowpea pods and American spotted flyflies, respectively.
2. Prevention of viral diseases.
In greenhouses, the spread of the virus can have disastrous consequences, especially of aphids. After the installation of insect nets on greenhouses, the transmission route of pests was cut off, which greatly reduced the incidence of viral diseases and had a prevention effect of about 80%.
3. Avoid falling fruit.
The fruit ripening period is in the summer rainstorm weather, such as the choice of insect net coverage, can reduce the ripening period caused by heavy rain caused by fruit fall, especially dragon fruit, blueberry, bayberry and other fruit ripening period encounters rainy years, to reduce its fruit fall more obvious effect.
4. Prevent frost.
If the young fruit stage and fruit ripening period of the fruit are in the low temperature season, frost damage or frost damage is prone to occur. The use of insect net coverage is not only conducive to improving the temperature and humidity in the net, but also the use of insect net isolation to prevent fruit frost from hurting people, which has a significant effect on the prevention and control of frost damage at the young fruit stage of loquat and the cold damage of citrus ripening.
5. Adjust the temperature, soil temperature and humidity.
The test results show that in the hot July-August, under the white insect control net of 25 mesh, the morning and evening temperatures are the same as those in the open field, and the noon is about 1 °C lower than the open ground.
In early spring from March to April, the temperature in the shed covered by insect nets is 1-2 °C higher than that of the open ground, and the ground temperature of 5 cm is 0.5-1 °C higher than that of the open ground, which can effectively prevent frost. In addition, the insect net can prevent some rainwater from flowing into the shed, reduce the humidity in the field, reduce the incidence of disease, and reduce the evaporation of water in the greenhouse on sunny days.
6. It has a shading effect.
Summer light intensity, strong light, will inhibit the vegetative growth of crops, especially leafy vegetable crops, and insect nets can play a shading role, 20-22 mesh silver gray insect net shading rate is generally around 20-25%.
<h1 class="pgc-h-arrow-right" data-track="50" > second, choose several problems that should be paid attention to:</h1>
At present, many vegetable farmers use 30-mesh insect nets, while some vegetable farmers use 60-mesh insect-proof nets. At the same time, the color of the insect net used by vegetable farmers is black, coffee, white, silver, blue, so what kind of insect net is suitable?
First, the insect control net should be reasonably selected according to the pests to be controlled.
For example, some moth and butterfly pests, due to their large size, vegetable farmers can use insect nets with fewer meshes, such as 30-60 mesh insect nets. However, for more weeds outside the shed, more whitefly, according to the small size of the whitefly, to prevent it from entering the insect net from the insect-proof mesh, it is recommended that vegetable farmers choose a denser insect-proof net, such as 50-60 levels.
According to different needs, different colors of insect nets are selected.
Because the thrips have a strong tendency to blue, the use of blue insect nets is easy to attract the thrips outside the shed to the outside of the greenhouse, once the insect net is not covered tightly, a large number of thrips will enter the shed, and the thrips outside the shed will not be harmed by covering the shed with a white insect net.
Another kind of silver gray insect net has a good anti-avoidance effect on aphids, and the black insect net shade effect is significant, and it is not suitable for use in winter and cloudy days. It can be selected according to actual use needs.
Generally speaking, compared with summer, the spring and autumn seasons are low in temperature and weak in light, so it is advisable to choose a white insect net; in summer, in order to take into account the shade and cooling, it is advisable to use a black or silver gray insect net; in areas with serious aphid and virus diseases, in order to avoid aphids and prevent viral diseases, it is advisable to use silver gray insect nets.
When choosing an insect net, also pay attention to check whether the net is complete. Some vegetable farmers reported that many of the insect nets they just bought have holes, so they remind vegetable farmers to expand the insect nets when purchasing and check whether there are holes in the insect nets.
However, when used alone, we recommend choosing coffee color, silver gray, and with the shade mesh, it is best to choose silver gray, white, mesh generally choose 50-60 mesh.
For example, the most critical aspect of the control process of tomato yellowing kojirophyll virus (TY) is the selection of a qualified insect-proof nylon yarn mesh. Under normal circumstances, a nylon yarn mesh for smoke-proof whitefly is enough for 40 meshes. The ventilation is not good, and it is difficult to cool down at night in the shed after colonization. However, at present, the mesh mesh produced by the mesh market is rectangular, the narrow side of the mesh mesh of the 40 mesh mesh can reach more than 30 meshes, and the wide edge is often only more than 20 meshes, which cannot meet the requirements of blocking whitefly, so only 50 to 60 mesh mesh mesh can be used to block the whitefly.
<h1 class="pgc-h-arrow-right" data-track="51" > installed in insect nets</h1>
1. Ensure coverage quality
The insect-proof net should be completely enclosed and covered, and the surrounding area should be tightly pressed with soil pressure, and fixed firmly with a pressed film line; the doors entering and leaving large and middle sheds and greenhouses must be paid attention to closing immediately after entering and leaving. The small arch shed insect net is covered for cultivation, and the height of the trellis should be significantly higher than that of the crop, so as to avoid the vegetable leaves clinging to the insect net, so as to prevent pests from feeding outside the net or laying eggs on the vegetable leaves.
For example, when controlling TY, tomatoes should be protected by insect nets throughout the planting period. The upper and lower air outlets of the shed, the vents of the back wall, and the two doors of the entrance and exit should be sealed with insect nets. Especially the two doors in the operation room, when there are personnel entering and leaving, the yarn curtain must be put back into place in time.
The insect-proof net used to close the air outlet should not leave a gap between it and the transparent covering, so as not to leave the entry and exit passage for the pest. Holes and gaps in the insect repellent web need to be inspected and repaired at any time.
2. Insect control treatment
Seeds, soil, plastic sheds or greenhouse skeletons, frames, etc. may carry pests and eggs. After the insect net is covered to the planting of vegetables, it is necessary to control the seeds, soil, shed skeleton, shelf material, etc., which is the key link to ensure the cultivation effect of the insect net cover.
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