Answer: You can purchase apple maggot traps that catch the adult flies on their sticky surfaces. Use 2 traps per dwarf tree, 2-4 per semi-dwarf and 6 or more on a full-size tree. They can be ordered from Gardener's Supply company, 128 Intervale Rd., Burlington, VT 05401, (800) 863-1700, http://www.gardeners.com.
Good luck with your tree.
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