gall fly

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gall fly:

see fruit flyfruit fly,
common name for any of the flies of the families Tephritidae and Drosophilidae. All fruit flies are very small insects that lay their eggs in various plant tissues.
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The goldenrod gall fly ecloses from the previous season's galls and females oviposit into the terminal buds of young S.
Black-capped Chickadees select spotted knapweed seedheads with high densities of gall fly larvae.
Inside, you'll discover a hard, pale "worm," probably the larva of a goldenrod gall fly.
The female gall fly lays her eggs in young buds, causing the plant to form galls.
Biology and ecology of the goldenrod gall fly, Eurosta solidaginis (Fitch).