It depends on the actual situation. Generally, although the temperature inside restaurants is very high in the north in winter, there are no mosquitoes and flies (because most mosquitoes and flies outside freeze to death or hide in the depths), so the main thing is to manage the garbage in restaurants and not leave it for too long, so mosquitoes and flies will not be born! Generally, it's better to dispose of restaurant garbage in the same day, not for many days. Otherwise, there will be a kind of fruit fly insect hatching. Although it is as annoying as flies, it likes fruits very much and its eggs can basically be found on the surface of most fruits, so don't store indoor garbage for more than two days or the fruit fly will hatch. The eggs of flies are generally distributed in a fixed place in a dirty place, so as long as rotten meat and eggs are not left in the kitchen for more than a week, maggots will not hatch, so it is less likely to give birth to flies. If there are still flies moving outdoors in the south of Shandong, if the doors and windows are not tightly closed, flies can easily enter to breed and lay eggs, so the fly prevention light should be turned on!