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Pullus impexus (Muls.) (Coleoptera, Coccinellidae), a Predator of Adelges piceae (Ratz.) (Hemiptera, Adelgidae), with notes on its Parasites*

Published online by Cambridge University Press:  10 July 2009

Vittorio Delucchi
Vittorio Delucchi
Affiliation:
European Laboratory of the Commonwealth Institute of Biological Control, Feldmeilen (Zurich).
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Extract

The biology of Pullus impexus (Muls.), a Coccinellid beetle predacious on Adelges piceae (Ratz.) in Switzerland, Germany and France, was studied during 1950–1952. The present work is a part of the research on the complex problem of factors in the control of the Balsam Woolly Aphid in Canada.

The morphology of both the larva and the adult has been studied. Some information has been provided on the probable distribution of the species.

P. impexus has only one generation a year. The eggs are deposited during the late summer or early autumn on infested trees and the larvae hatch in April. The larvae develop and adults appear in May. The adults of the new generation are to be found in June together with adults of the old generation. In the biology, particular attention has been directed to the diet of the insect in each of its stages, in order to establish the value of the species from the standpoint of biological control.

Two new species of Hymenopterous parasites were found in Switzerland and in Germany, Scymnophagus mesnili Ferr., a parasite of pupae, and Centistes scymni Ferr., a parasite of the imagines. The life history of these species has been briefly studied. A cephaline gregarine species was noted in the mesenteron of adults of P. impexus and a nematode in the abdominal cavity of a female. The two Hymenopterous species provide an important limiting factor in the increase of the population of P. impexus.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 45 , Issue 2 , June 1954 , pp. 243 - 278
Copyright
Copyright © Cambridge University Press 1954

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