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Extension > Garden > Diagnose a problem > What insect is this? > Garden Pests > Caterpillars, maggots, grubs, and similar immature insects - Under than 1/4 inch long > Apple maggot

Apple maggot
Photo Credit: Agriculture & Agri-Food Canada

Apple maggot
Rhagoletis pomonella
Size: Up to ½ inch long

Where/When: Primarily feeds on apples and large crabapples. Appears in early July and is active until September.  Peak activity occurs from late July through early August..

Significance: Causes distorted fruits due to oviposition activity of the adult fly.  Pulp breaks down, discolors, and starts to rot as a result of maggots tunneling through the flesh. Larvae are rarely, if ever, seen.
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