Apple maggot - Rhagoletis pomonella (Walsh) Home > Pest management > apple maggot In Southern Michigan, adult emergence begins in late June and continues until September, peaking towards the end of July. In Northwest Michigan, adult emergence typically begins around the second week of July. Traps should be set in mid-June. First treatments should be made 7-10 days after the first fly is trapped. Mature larva is 8 mm long, has no legs, no distinct head capsule, and is creamy-white except for two dark mouth hooks. The apple maggot adult is about 6 mm long with distinctive wing pattern. The black thorax is marked with a dorsal white spot. The female apple maggot punctures the apple to deposit her egg under the skin, causing the fruit to take on a dimpled, lumpy appearance. Larval feeding leaves brown trails through the flesh of the apple.   Wing banding patterns of deciduous fruit flies   Additional information For more monitoring information and evaluation of available pesticides: Michigan Fruit Management Guide A Practical Guide to Scouting Apple Orchards – a DVD showing how to scout apple orchards. MSU Diagnostic Services for assistance in pest identification. MSU Fruit Crop Advisory Team Alert newsletters for current pest/crop conditions. This information was developed from A Pocket Guide for IPM Scouting in Michigan Apples by David Epstein, Larry J. Gut and George W. Sundin. Purchase this in a pocket-sized guide for reference in the orchard from MSU Extension (publication E-2720).
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09/22/08 Funding support: Project GREEEN, the Michigan Apple Committee and the MSU IPM Program. Read disclaimer. Web developer: J.N. Landis.