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Parasites of the Wheat-stem Sawfly, Cephus pygmaeus, Linnaeus, in England

Published online by Cambridge University Press:  10 July 2009

George Salt
George Salt
Affiliation:
Imperial Institute of Entomology.
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Extract

For a number of years the western grass-stem sawfly, Cephus cinctus, Norton, has been accounted one of the major insect pests of wheat in Western Canada. Originally a grass-feeder, it began to attack wheat about the beginning of the present century, at first only occasionally and at the edges of fields in Manitoba, later much more commonly and with a very wide distribution throughout the wheat-growing areas of Manitoba, Saskatchewan, and Alberta. While this sawfly was confined to native grasses it was held in check by two principal factors (Criddle, 1922) : shortage of grass stalks suitable for oviposition, and parasites. When, however, it began to attack wheat, both of these restraints were evaded. In the first place the wheat fields provided an abundance of host-plants. In the second place, the natural parasites of the sawfly did not move with it into the grain fields—whether they are unaware of the presence of their host in wheat plants or are unable to attack it in that situation is unknown.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 22 , Issue 4 , December 1931 , pp. 479 - 545
Copyright
Copyright © Cambridge University Press 1931

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