Pteromalus puparum, common name white butterfly pupal parasitoid wasp, is a widely distributed species of endoparasitic wasp that oviposits in and parasitizes Lepidoptera cocoons.

It is used as a biological control of the white cabbage moth.

[1] This wasp parasitizes a number of other species, including at least 11 kinds of swallowtail butterflies.

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