The methods to reduce the harm of sweet potato ant elephant are: first, strict quarantine to prevent artificial transmission of insect sources; Rice-land rotation to reduce insect population density; Poisonous bait is used to trap and kill. In early winter or early spring, fresh potatoes or chips and fresh stems and leaves are soaked in 40% dimethoate emulsion or 90% crystal trichlorfon 500 times solution 12 ~ 24 hours, and then taken out and dried to obtain the poison bait. Dig 50 ~ 60 small shallow pits per mu, put bait in them and cover them with grass, and change them every 5 ~ 7 days 1 time. The trapping effect is very good. Soak the seedlings in liquid medicine, that is, soak the potato seedlings in 40% dimethoate emulsion or 800 ~ 1000 times of crystal trichlorfon solution, take them out immediately, dry them slightly, and then plant them; Cover with sand to fill in the joints, cultivate the soil in time to prevent the potato pieces from being exposed, and also have the function of insect prevention; Use sexual attractants to trap and kill.