Cecidomyiidae (gall midges - weed bioagents)

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gall of Rhopalomyia tanaceticola
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Cecidomyiidae (weed bioagents)

This family contains around 5,000 species of small, often tiny flies, usually ½ to 4 mm long. Most are plant parasites constructing galls and are specialized on one or a few closely related hosts. A gall midge spends nearly all its life as larva inside a plant gall. Adults only live for a few days and often do not feed. A number of species infests weeds and are considered beneficial.

The adults are mosquito-like with long legs and long antennae. They are usually yellow, orange or red in colour, hairy and with large wings. The antennae have around 15 segments, including 2 characteristic basal ones, with whorls of hairs. The compound eyes meet above the antennae and females often have a long ovipositor.


For more details see the respective page in Wikipedia.

This page deals only with weed bioagents. For other groups of Cecidomyiidae see:

The following genera are currently entered as weed bioagents under this family: