Problems to be noticed in the cultivation of vegetable insect nets

As a new technology, the insect-resistant net covering cultivation has been widely used and spread throughout the country in recent years. It adopts full-coverage, closed cultivation to prevent the invasion of pests, and less or no spray of pesticides to achieve pollution-free vegetable production. However, in the process of popularization, insect pests in the net are still constantly occurring, and the vegetables are seriously ill and even result in the loss of leafy vegetables. Through investigations and experiments conducted over the past few years, we believe that the following issues should be taken into account when using insect network coverage technology. 1 The shed body needs to be firm. At present, there are three commonly used insect net covering cultivation methods: one is to cover the original scaffold, the other is to cover rain cultivating in the original shed skirt membrane, and the third is to build a large net room, and the main column can be used. 10cm diameter steel pipe or 12cm * l2cm cement column, with a wire mesh cable or galvanized steel wire above 1m * 1m mesh structure. After covering insect nets, in the event of strong winds, the wind can pass through the mesh, and the net can also block the wind, resulting in a huge force and easily causing the collapse of the shelter. If a storm occurs at the same time, the risk is greater. Therefore, in the multiple seasons of natural disasters such as typhoon and heavy rain, it is necessary to reinforce the existing sheds before accessing the Internet. For example, the two ends of the scaffolding may be braced, or the wire ropes installed at anchor may be pulled diagonally. Before using the large-scale net room every year, check whether the column is dislocated and whether the steel wire rope is worn. In the course of use, it is also necessary to check frequently. In case of severe weather, if it is damaged, it needs to be repaired immediately to prevent unnecessary damage caused by collapse. . 2 Cover nets should be tightly covered with nets. On the one hand, they can effectively prevent the entry of pests, and on the other hand, they can increase wind resistance. Beginning to cover the net requires tight mesh foot pressure, which can be used to open the ditch around, the depth of which is determined according to the area of ​​the net, and when the thickness is large, the thickness is shallow and shallow, and it generally takes more than 20cm. The net is first pressed into the ditch, and then the cover soil is compacted. can. At the same time, it is necessary to check whether the insect nets are damaged or not. If problems are found, they must be promptly repaired to prevent the nets from being damaged and pests from intruding. After being affected by severe weather, check whether the pressure ropes on the Internet are tightened or broken. If such problems occur, they must be promptly repaired and tightened to prevent the strong wind from lifting the net and causing damage to the shed. 3 After the soil needs to be sterilized or after mulching, the soil must be disinfected before planting and planting, and 5% butyl carbofuran (good winter) 2kg/667m2 can be used as toxic soil to disinfect the soil, or to use 20 % Phoxim 1 000 times watered the soil to prevent underground pests. Use 3000 times green hengheng, or 600-800 times green hengheng to sprinkle the soil to prevent soil-borne diseases from occurring. 4 It is necessary to clean the sowing of the pastoral gardens, clean up the interior of the nets, diseased leaves, and weeds before the colonization to reduce the number of insect pests. Weeds should be protected from weeds in and around the footings, eliminate pest habitats, and prevent pests from spawning through hatches and hatching hazards. High-vegetable vegetables in order to prevent the leaf from touching the net introduction of insects to spawn, should do a good job of vines or pruning work, when sowing leafy vegetables should be around 40cm around the insect net. 5 Mesh specifications should be reasonably selected when purchasing insect nets. Generally, 18-22 mesh insect nets should be selected to prevent invasion of pests, increase ventilation and ventilation capacity, and reduce temperature and humidity in the network. 6 varieties need to be covered with pest control network cover cultivation, both blocking the invasion of pests, but also hindered the entry of beneficial insects, so when selecting vegetable species, avoid choosing insect cross-pollination vegetables, such as melon, gourd, pumpkin, etc., suitable for cultivation Leaf vegetables, eggplants, beans and other vegetables. In the high temperature season in summer, the temperature in the general network is 2~3°C higher than that outside the network, and a good type of heat resistance is required. 7 Density needs to be appropriate For leaf vegetables harvested at one time, due to the high ground temperature in the network, affecting the seed germination rate, the seeding rate should be increased appropriately. If the seedling emergence is too dense, the seedlings should be listed on the market in time. For vegetables harvested many times, such as kidney beans and lentils, they should be properly sowed in order to prevent diseases caused by excessive humidity. 8 Drainage needs to be smooth after covering the insect net. Rainwater can enter. After rain, it is easy to cause dead seedlings or diseases due to high temperature and high humidity. It should prevent the accumulation of water in the field, effectively reduce the water table, and reduce the humidity in the network. Deep groove sorghum can be used. The sulcus depth should be about 30cm, and ensure that the shed outside the drainage channel. 9 Harvesting needs timely pest control network coverage is currently widely used in leafy vegetable production, when the growth of field vegetables is very depressing, it should be harvested in time, if the humidity at this time, especially after the rain, it is easy to cause devastating decay or disease. 10 Nets can be postponed. Currently, insect nets are generally used during the season of high insect pests in summer and autumn. After trials, the delay in exposing the nets can be used to prevent frost and improve the commercial quality of vegetables. It can be used for freeze-proof cultivation of cabbage, broccoli, cauliflower, etc. The effect is very obvious, but it should be timely and timely according to the weather conditions in different places. Anti-snow pressure net room.

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