After the summer, the outside temperature rises. In order to guarantee the temperature in the shed, the greenhouse is usually open at night and day. This year, the weather is relatively dry and there are many pests. With the arrival of summer, the peak period of pest growth and reproduction has also come. In order to prevent pests from entering the greenhouse and harming crops, it is recommended that vegetable farmers set up pest control nets in time to prevent pests from entering the shed. In May and June of each year, it is the peak period of transmission and spread of pests. If locusts in wheat fields occur seriously, if no insect nets are installed in the sheds, a large number of locusts fly into the sheds from the wheat fields and the breeding speed is astonishing. The locusts transmit virus diseases in addition to directly harming vegetables, and can spread many viruses. . As recently reported by a vegetable farmer in Qingzhou, several strains of virus-infected plants were found in the shed half a month ago. There were no locusts in the shed. The shed was recently infected with virus disease, and only the garden was removed. Therefore, it is recommended that vegetable farmers set up pest control nets as soon as possible before the outbreak of pests. The number of net yarns to be used should be determined according to the specific circumstances. Too dense and unfavorable ventilation will reduce the temperature. If it is too sparse, the insects will easily enter and the pest control effect will not be achieved. Under normal circumstances, it is appropriate to use a white insect net of 40 to 60 mesh. In addition, to do a good job in the weeding work around the shed, the dead leaves and rot must be cleared out of the shed to reduce the host of locusts, whiteflies and other pests, to prevent pests from staying and staying around the shed.