Summer and autumn are the peak period of diseases and pests of various crops. The peak period of application of pesticides is also a dangerous period for agricultural product quality and safety accidents. In order to ensure the safety of the general public at the tip of the tongue, Wuling District actively promotes the principle of “prevention-oriented, comprehensive prevention and control†in vegetable production. It focuses on agricultural control, and uses physical and biological control and chemical control methods according to local conditions. , Comprehensive control of pests and diseases, minimize the use of pesticides, and strive to ensure the quality and safety of edible agricultural products. The technology of vegetable insecticide net covering and cultivation is an effective physical control technique popularized in Wuling District in recent years.
I. Insect net covering cultivation principle
Insect nets are a new type of agricultural cover material. It uses high-quality polyethylene as raw material, adds anti-aging, anti-ultraviolet and other chemical auxiliaries, and is made by drawing and weaving. It is in the form of window screening and has the characteristics of tensile strength, heat resistance, water resistance, corrosion resistance, non-toxic and tasteless, etc. Proper storage life of up to 3 to 5 years. Insect nets cover cultivation of vegetables is to build artificial barriers by covering the scaffolds to prevent pests from the net and cut off pests (adults) propagation routes, effectively control the spread of various pests and prevent the spread of the virus, significantly reducing pesticides. The amount used is a new, simple, scientific and effective pest control measure.
Second, insect nets covering cultivation type
1, the whole network coverage method: that is, the entire shed on the scaffolding to cover insect nets, according to the form of scaffolding can be divided into shed coverage, small and medium shed coverage, flat shed coverage. In this way of covering, before closing the net, the field is first arbitrarily regulated and the foot pedestal is removed. At the same time, chemical weeding and soil disinfection are carried out, and then the insect net is covered, the earth is compacted around the earth, and the rope between the sheds is pressed against the wind and the wind is closed. cover.
2, omentum coverage method: that insect nets and agricultural film combined coverage. This type of covering is the agricultural film on the roof of the scaffold and the insect-proof net around it. The omentum cover avoids the erosion of rainwater on the soil, protects soil structure, reduces soil moisture, and protects against rain and insects. In continuous rain or heavy rain, the humidity in the shelter can be reduced and the occurrence of soft rot disease can be reduced. In hot and sunny weather, it can easily cause high temperatures in the shed. With the omentum covered, the old film grown on the front of the vegetable can be used for pest control and cultivation to reduce the cost.
Third, vegetable pest network coverage cultivation technical points
1, emphasis on variety selection. Insect nets cover cultivation time is mainly in the summer and autumn high temperature season, should use heat-resistant, moisture-resistant, disease-resistant varieties.
2, a reasonable choice of insect nets. The number of insect nets increased, the temperature in the net increased, and ventilation and ventilation performance deteriorated. White nets have higher temperatures than silver-gray nets and black nets. Silver gray has a repellent effect. Therefore, 22 mesh silver grey mesh is recommended for production.
3, using appropriate coverage. The coverage of the whole network and the coverage of the omentum have the functions of preventing insects, preventing diseases, and increasing production. However, they have different adaptability to abnormal weather and should be used flexibly. In summer and autumn, where high temperatures, little rain, windy winds, or strong typhoons occur, the entire network should be used for cultivation. In the rainy season or continuous rainy weather, omentum can be used to cover cultivation.
4, the implementation of full coverage. The shading rate of the insect nets is small, and the cultivation in the summer and autumn seasons will not affect the light output of the vegetable crops. In order to cut off the harmful insect pests, pest control nets must be covered throughout the growing period, and must be planted after netting. Cover the net before deep turning. When covering the net, the perimeter of the insect net must be tightly compacted to prevent pests from sneaking into eggs. Disinfect the soil before sowing to kill pests and eggs that remain in the soil.
5. Strengthen field management. To apply base fertilizers, reduce the number of top dressings. Watering and fertilizing can be used for pouring or furrow irrigation outside the net. Wherever possible, mini-drip irrigation and sprinkler irrigation are best used to reduce the number of network operations. When you enter and exit the net, you must pull the net cover in time to prevent pests from invading. To inspect the fields regularly, remove the pest egg pieces that are hung on the net or in the field, and inspect the nets and membranes for damage. In case of hot sunny weather, no matter what kind of covering method is used, cooling measures such as shading and irrigation should be adopted.
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