GALL-INDUCING INSECT

A 'gall-inducing insect' is any insect that can cause the growth of gall within plants. The term 'gall fly' is also used to cover these species, although most are not true flies.
There are several groups of insects that meet this description. They include the gall wasps, scales, gall midges, aphids, and psyllids.
Galls are growth deformities induced in certain plants by various insects which are mostly species-specific.