In summer, vegetables are grown in arched sheds, and shading nets and insect nets are indispensable. The sunshade net should be installed on the iron wire 2 meters high from the ground in the arch shed, and the insect-proof net should be installed at the height of 50 cm on both sides of the arch shed. The application of the two nets has played an active and effective role in reducing the temperature in the shed and preventing the intrusion of pests.
When using sunshade nets for vegetables in arch sheds in summer, two points should be paid attention to: First, the sunshade nets are installed in the arch shed instead of covering the outside of the shed film like a large shed. Practice has proved that installing the sunshade net in the arch shed can make the air convection better, the cooling effect is better, and it is easy to operate. The second is to choose shade nets of different colors according to the types of vegetables grown. Shading nets are available in black, white, silver-gray, etc. Black shading nets are suitable for vegetables with weak light requirements, white shading nets are suitable for light-loving vegetables, and silver-gray shading nets have the effect of avoiding aphids and preventing diseases. In addition, the black shading net is covered at noon on a sunny day, and should be removed in time in the morning and evening, and on cloudy days. Sunny weather generally starts to cover at 9 am and will be removed at 3 pm.
Insect-proof nets Insect-proof nets can not only shade, but also prevent insects, and can be used all year round. Pay attention to the use of anti-insect nets: First, cover the whole process during the growth period of vegetables. Insect nets have a low shading rate and should be covered throughout the entire process to prevent pests from invading. After the insect screen is installed, both sides should be compressed with bricks or soil blocks, and the net needs to be pressed firmly with a pressure wire to prevent it from being blown away by the wind. Second, choose the appropriate specifications. The specifications of the anti-insect net mainly include amplitude, aperture, wire diameter, color, etc. In particular, the pore size is generally calculated by the number of meshes. Too few meshes will result in large meshes, which will not provide the proper insect control effect; too many meshes and small meshes will result in good insect control effects but increased costs. At present, the recommended insect-proof net used in production is 24-40 mesh. Third, pest control should be combined with chemical control. Some vegetable farmers think that if they spend money on insect nets, they don’t have to worry about pest control. In fact, they can only prevent pests from invading. If there are insects in the shed, chemical control should be carried out.
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