Plants and Animals

Why does gall develop on a plant?

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Chemical irritants are released by parasitic fungi, bacteria, nematode worms, gall insects, and mites. The gall insects (e.g., certain aphids, wasps, moths, beetles, and midges) deposit their eggs in the plant tissues, which begin to swell as the larvae hatch. Sometimes the larvae feed on the gall and pupate within it. The irritant is released by the female at the time of oviposition or by the developing larva itself.

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