History of the Praon and Aphidius Parasites 1 of the Pea Aphid 2 in the Pacific Northwest 3 , 4

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Abstract
From 1959 through 1964, Federal and State entomologists in Idaho, Oregon, and Washington imported, reared, and released Praon pequodorum Viereck, Aphidius ervi pulcher Baker, Aphidius ervi ervi Haliday, and Aphidius smithi Sharma & Subba Rao to augment present populations or to replace lost populations of native parasites capable of providing biological control of the pea aphid, Acyrthosiphon pisum (Harris), on peas and alfalfa. As a result, populations of P. pequodorum and A. pulcher have become increasingly effective against this pest, and A. ervi has become established in coastal Oregon and probably throughout Washington and Idaho. Also, in only 5 years, A. smithi has spread into nearly all the alfalfa- and pea-growing areas of the Pacific Northwest.

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