Vegetable pest isolation and cultivation techniques

1. Pay attention to the selection of varieties to prevent pests and isolate cultivation to prevent pests from directly damaging or injuring eggs in the house, so that no (or less) pesticides are used, and the vegetables produced meet the requirement of no pollution. Insect nets cover cultivation time is mainly in the summer and autumn high temperature season, should use heat-resistant, moisture-resistant, disease-resistant vegetable varieties. 2. Reasonable selection of insect nets The number of insect nets increases, the temperature in the net increases, and ventilation and ventilation performance deteriorate. 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, the use of appropriate coverage pest control isolation cultivation of the whole network coverage and omentum cover two ways. 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 cover 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 can avoid the erosion of the rainwater on 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 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 can be covered with omentum cultivation. 4, the implementation of full coverage of insect nets shading rate is small, summer and autumn cover cultivation will not cause the lack of light on 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, to strengthen the management of the field to apply base fertilizer, reduce the frequency of topdressing. 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, 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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Such antibiotics first affect the outer membrane of sensitive bacteria. Drug ring part of polypeptide amino and lipopolysaccharide in the outer membrane 2 valence cations combining site to produce electrostatic interaction, destroy the integrity of the outer membrane damage, fatty acid part of drugs to penetrate the outer membrane, thus increase the permeability of cell size, lead to intracytoplasmic phosphate, nucleosides and other small molecules to escape, straight die cause cell dysfunction. Gram-positive bacteria do not respond to such antibiotics because they have a thick cell wall that prevents drugs from entering the bacteria.

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