Emphasis on the selection of species to prevent pests and isolation cultivation to avoid direct damage to pests or the risk of internal spawning, so that no or less use of pesticides, vegetables produced easily meet the requirements of pollution-free. Insect isolation and cultivation time is mainly in the summer and autumn high temperature season, and heat-resistant, moisture-resistant and disease-resistant vegetable varieties should be selected.
Reasonable selection of insect nets and insect nets will increase the number of nets, which will increase the temperature in the net and deteriorate the ventilation and ventilation performance. 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.
The use of appropriate coverage methods for pest isolation training has both full-web coverage and omentum coverage. The whole network is covered with a full shed covering the insect nets on the scaffolds. According to the form of the scaffolds, it can be divided into greenhouses, small and medium sheds, and flat sheds. The omentum coverage is the combined coverage of the insect net and the agricultural film, namely, the agricultural film on the roof of the scaffold, and the insect-proof net on the four sides, which can prevent the rainwater from eroding the soil and protect the soil structure and reduce the soil moisture. All network coverage and omentum coverage have the functions of preventing insects and diseases, but they have different adaptability to various abnormal weather and should be used flexibly. In the summer and autumn in high temperature, little rain, and windy weather, the whole net should be used for cultivation. In the rainy season, or continuous rainy weather can be covered with omentum cultivation.
The implementation of full-coverage pest control nets has a low shading rate, and cultivation in summer and autumn will not affect the light output of the vegetable crops. In order to cut off the harmful insects, the insects must be covered with insecticide nets during the entire growth period. 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.
Strengthen field management to apply basal fertilizer and reduce the number of top dressings. Watering and fertilizer application can be poured outside the net, or furrow irrigation, where conditions are best to use drip irrigation and micro-sprinkler irrigation, to minimize 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, check the nets and membranes for damage, and repair them in time. In case of hot weather, no matter what kind of covering method is adopted, the cooling measures such as shading and irrigation shall be adopted.
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nature, is the bee from the flowers (nectar plants and pollen plants)
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