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The meristems, where plant cell division occurs, are the usual sites of galls, though insect galls can be found on other parts of the plant, such as the leaves, stalks, branches, buds, roots, and even flowers and fruits.Gall-inducing insects are usually species-specific and sometimes tissue-specific on the plants they gall.
Insect galls are usually induced by chemicals injected by the larvae or the adults of the insects into the plants, and possibly mechanical damage.
Insect galls are the highly distinctive plant structures formed by some herbivorous insects as their own microhabitats.
They are plant tissue which is controlled by the insect.
After the galls are formed, the larvae develop inside until fully grown, when they leave.
In order to form galls, the insects must take advantage of the time when plant cell division occurs quickly: the growing season, usually spring in temperate climates, but which is extended in the tropics.
of plant tissues, similar to benign tumors or warts in animals.