Gall-inducing insects. At least seven groups of insects, in six orders, have independently evolved the gall-inducing habit. Several…

Gall-inducing insects. At least seven groups of insects, in six orders, have independently evolved the gall-inducing habit. Several adaptation hypotheses have been proposed, but it is largely unknown why this habit evolved and how gall-inducing insects induce gall formation in plants; chemical, mechanical, and viral triggers have been discussed.

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Source: List of unsolved problems in biology (CC BY-SA 4.0)