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The Insect Parasites of the Spruce Sawfly (Diprion polytomum, Htg.) in Europe

Published online by Cambridge University Press:  10 July 2009

K. R. S. Morris ,
E. Cameron  and
W. F. Jepson
K. R. S. Morris
Affiliation:
Farnham House Laboratory, Imperial Institute of Entomology.
E. Cameron
Affiliation:
Farnham House Laboratory, Imperial Institute of Entomology.
W. F. Jepson
Affiliation:
Farnham House Laboratory, Imperial Institute of Entomology.
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Extract

A severe outbreak of the Spruce Sawfly (Diprion polytomum, Htg.) in Eastern Canada led to a request to Farnham House Laboratory to investigate, and if possible collect and export, the parasites of this insect in its native home in Europe.

Work started in 1932 and it was found that D. polytomum was a comparatively rare insect in Europe, though widely distributed. It is heavily parasitized, 31 species of Hymenopterous and Dipterous parasites having been found up to the present. Nearly twenty-eight million parasitized cocoons and eggs of this and other species of Diprion have been collected and despatched from Europe, and work is still continuing.

Previous to the present work only 13 species of parasites, a list of which is given, were recorded from this host.

Of the 31 species now known, 15 are primary, 5 can be primary or secondary, and 9 secondary only; in 2 cases the status is not known.

Descriptions of all the species are given and in the case of the obligatory and facultative primaries, the biology and immature stages are also described and notes added on their suitability for introduction into Canada. A key to the adult parasites is given, and a key to the larval stages of the primary and facultative primary parasites. Some practical notes are also given, including methods of accelerating the emergence of parasites in winter and methods of preparing parasite larvae for examination and identification.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 28 , Issue 3 , October 1937 , pp. 341 - 393
Copyright
Copyright © Cambridge University Press 1937

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