In May, there are three main types of insect pests in apple trees: spider mites, aphids, and leaf insects. Prevention and control of red spiders: Since 7-10 days after flowering, strict monitoring of the occurrence of red spiders. If every leaf spider has 3 to 5 active insects in early May, the acaricide should be sprayed in time. Later along with the inspection found with governance, do not let it spread. The acaricides that kill Starscream are: 40% dicofol 1000 times, 40% aqueous phosphatidylcholine 2000 times, 50% 1 600 1200 times, 5% Nissopol 2000 times, 20% gram. Special 2000 times liquid, 20% swept 300 times liquid, in addition to full net and so on. Control of aphid species: Before and after flowering, the fast-growing period of new shoots is the period of locusts. Compared with other insect pests, locusts are relatively less harmful, but in severe cases they also lead to devastating injuries. Therefore, they must be actively controlled. The locusts that occurred in May were mainly apple gall tumors, which also occurred in their peak period. It can be controlled with 40% omethoate 1000 times, or 50% parathion emulsion 2000 times. In addition, there are pesticides such as chlorfenone, chlorfenacin-1, and eucalyptus.