25 mesh, 40 mesh, 60 mesh vegetable insect nets have what role
25 mesh, 40 mesh, 60 mesh vegetable insect nets have what role
With the improvement of agricultural technology, in order to prevent pests, more and more farmers choose to cover vegetable insect nets, of course, different varieties of vegetables covered by insect nets requirements are different, such as insect nets specifications, mesh, size, color and so on. Common insect nets have three kinds of white, black and silver, in the greenhouse application, farmers generally choose 25 mesh, 40 mesh, 60 mesh and other specifications of insect nets, what is the difference between these three? Next, let's briefly understand the role of these three mesh nets.
The insect control net of 25 mesh vegetable greenhouse had little effect on the temperature and relative humidity in the greenhouse, but delayed the occurrence time of high temperature and low humidity in one day, and the high temperature and low humidity in the test were delayed for about 4h and about 2h. The 25-mesh insect-proof net coverage has a certain shading effect, so it plays a buffer role in the temperature rise and humidity drop in the shed. Due to the sparse mesh of the 25-mesh insect-proof mesh, the shading rate is low, so the high and low values of temperature and humidity are basically the same as the control.
The effect of insect control net on temperature and relative humidity in 40 mesh vegetable greenhouses is greater than that in 25 mesh. The trend of temperature and humidity change in the 40-mesh insect-proof net shed was basically the same as that of the control, but the range of change decreased and the relative humidity increased. In cloudy weather, due to the dense insect-proof mesh of the 40-mesh vegetable greenhouse, high temperature and low humidity appear in the shed, which has a greater impact on the growth of vegetables.
Overall comparison, 25 mesh greenhouse insect control net cover temperature and relative humidity changes little, the impact on vegetable growth is small, at the same time, 25 mesh insect control net can block most of the pests, such as whitefly, cabbage worm, moth, aphids, hopping beetle, beet moth, American spot miner, moth, and so on, but also reduce the spread of virus disease, coal pollution disease and other diseases. It is generally recommended to use a pest control net of about 25 mesh in production.
Vegetable pest control net specification and price 60 mesh net price concessions, generally about one yuan, many farmers are more hesitant to choose 40 mesh or 60 mesh when covering the insect net, we can choose according to vegetable varieties, and demand.
In autumn, many pests began to transfer to the shed, especially some moth and butterfly pests, because of the larger size of these pests, vegetable farmers can use a relatively small number of insect control nets, such as 30-60 insect control nets. However, for more weeds outside the shed and more whiteflies, according to the smaller size of the whiteflies, to prevent them from entering the holes of the insect-proof net, it is recommended that vegetable farmers use a denser insect-proof net, such as 40-60 purposes. It is recommended that when used alone, coffee color and silver gray should be selected, and when used with sunshade net, silver gray and white should be selected, and the mesh is generally 40-60 mesh.
Greenhouse can cover the whole vegetable insect net, do not need to cover after the cover, day cover night expose, sunny cover shade and other agricultural operations, convenient management, labor saving, and can effectively control the harm of vegetable pests, do not need to spray pesticides, save pesticide costs and spraying workers, generally per acre per crop can save pesticide cost 80~100 yuan.
