Ichneumon wasps are parasitoids; females lay their eggs on a caterpillar and the wasp larva burrows into and develops inside this host, eating its internal tissues and eventually killing it after it pupates. The adult ichneumon flies emerge from the remains of the dead host and are active at night (1) (2). Two generations are produced each year; the adults of the first generation are present from May to June, those of the second generation from November to December (1).
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