(1) Insect netting
Insect netting is a kind of mesh fabric made of polyethylene with anti-aging, anti ultraviolet and other chemical additives as the main raw materials, which is drawn. It has the advantages of high tensile strength, heat resistance, water resistance, corrosion resistance, aging resistance, non-toxic and tasteless, and easy disposal of waste. It is placed at the tuyere or covered around the vegetable growing plot in summer, which is mainly used to prevent external pests such as whitefly, whitefly, cotton bollworm, leaf miner and so on from invading the greenhouse, so as to greatly reduce the occurrence of pests in protected cultivation and reduce the use of chemical pesticides. In addition, it has the functions of light transmission, moderate shading and ventilation in summer. Attention shall be paid to the selection of aperture when using pest control net. Generally, 20~32 meshes are suitable for vegetable production, with wire diameter of 0.18~0.30 cm and width of 1 m, 1.5 m, 1.8 m and 2.0 m. The white or silver gray anti insect net is better.

(2) Shade netting
Shade netting, also known as cool yarn, is a mesh material made of polyethylene, polypropylene and polyamide, which is processed, drawn into flat wire and woven. The sunshade net is light in weight, high in strength, aging resistant, and easy to roll. It can achieve different ventilation and light transmittance by controlling the mesh size and density. Sunshade net can weaken light, change light quality, reduce air temperature, ground temperature and leaf temperature, and thus reduce surface evapotranspiration. The shading rate of the shading screen is 25%~70%, and the width is 90cm, 150cm, 220cm, 250cm, etc; The meshes are evenly arranged, and some are thin and dense; The colors are black, silver gray, white, fruit green, black and silver gray, and should be selected according to the purpose of use. At present, two kinds of vegetables with light transmittance of 35%~55% and 45%~65% are widely used in the production of protected vegetables, with a width of 160~220 cm, and the colors are mainly black, green and silver white