Apple Tree - Knowledgebase Question

Quincy, Ca
Question by pioneerrv
May 15, 2007
The last few years we have had lots of apples but most of them have holes (worms?). We can we do to control this problem?


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Answer from NGA
May 15, 2007

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The fruits of apple trees are often ruined by Coddling Moth larvae and Apple Maggot. Coddling moth larvae are usually found in the core area of the apple. The adult lays eggs inside apple blossoms. When the fruit forms, the egg hatches into a worm-like larvae. Apple Maggot is the immature form of an adult fly. The fly lays eggs just under the skin of the developing apple. When the eggs hatch, the larvae tunnel throughout the flesh of the apple, leaving rust-colored frass (bug poop). When it's time to leave the apple, the larvae digs an exit hole, spins a web, and pupates in the soil below the tree, where it emerges as an adult some months later. Control of both these pests is difficult. There are some pheromone traps (sex attractant) available through mail order companies that you can hang in your trees. Many gardeners have success in trapping Apple Maggots by using red rubber balls, or painting styrofoam balls red, coating either with sticky 'Tanglefoot', and hanging them in the tree. The flies are attracted to the red spheres and try to lay their eggs. They'll be hopelessly stuck if they land. Be sure to pick up and bury any infested or fallen fruit from the tree to prevent a population explosion of either pest.

There is also a spray schedule designed to kill apple maggot adults; malathion sprays beginning in July provide some degree of control. Check your garden center for products container malathion.

Best wishes with your apples!

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