Aphidius is a genus of insects of the family Braconidae.
The genus has a cosmopolitan distribution.
Adult Aphidius is a small wasp, usually less than long. Aphidius wasps are endoparasitoids of aphids. The female wasp lays eggs in an aphid. When the eggs hatch, the wasp larvae feed on the inside of the aphid. As the larvae mature, the hosts die and become slightly enlarged or mummified, often becoming tan or yellow. Complete metamorphosis occurs within the host. The adult parasite chews the sugar out of the mummy leaving a hole.
The genus Aphidius includes many species that provide biological pest control of aphids on agricultural crops, greenhouses, urban landscape and home gardens.
Species Aphidius absinthii Marshall, 1896 Aphidius adelocarinus Smith, 1944 Aphidius alius Muesebeck, 1958 Aphidius apolloni Aphidius avenaphis Fitch Aphidius balcanicus Tomanović & Petrović, 2011 Aphidius banksae Kittel Aphidius colemani (Dalman, 1820) Aphidius chaetosiphonis Tomanović &Petrović, 2011 Aphidius ervi (Haliday, 1834) Aphidius linosiphonis Tomanovic & Starý, 2001 Aphidius gifuensis Ashmead, 1906 Aphidius matricariae (Haliday) Aphidius nigripes Ashmead, 1901 Aphidius rhopalosiphi De Stefani Perez Aphidius transcaspicus Telenga, 1958 Aphidius uzbekistanicus Luzhetzki
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