Apple Maggots are a type of fruit fly that attack apples, blueberries, hawthorn, plums, pears and cherries. They cause extensive fruit damage that renders fruit useless. The fly is smaller than a housefly and appears throughout the summer. Most fruits are attacked by flies that lay their eggs during late spring to early summer. The SpringStar Apple Maggot lure is a one-season, controlled-release lure system. Flies are attracted by the lures and come to a sticky demise on the juicy-looking apple sphere. Hang traps 1 to 2 weeks before bud break. Lures last up to 4 weeks.