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Outbreaks and recession populations of the desert locust Schistocerca gregaria (Forsk.)

Published online by Cambridge University Press:  10 July 2009

Jeremy Roffey ,
George Popov  and
C. F. Hemming
Jeremy Roffey
Affiliation:
Anti-Locust Research Centre (Ministry of Overseas Development), College House, Wrights Lane, London
George Popov
Affiliation:
Anti-Locust Research Centre (Ministry of Overseas Development), College House, Wrights Lane, London
C. F. Hemming
Affiliation:
Anti-Locust Research Centre (Ministry of Overseas Development), College House, Wrights Lane, London
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Extract

New evidence on the nature of recession populations of the desert locust, Schistocerca gregaria (Forsk.), and on the nature and role of its outbreaks is presented. It is shown that the hopper bands and swarms reported during the 1963–67 recession differed qualitatively and quantitatively from those characteristic of plague periods and were numerically much smaller than some low density non-swarming populations. Gregarisation frequently occurs in the latter and may be on a scale sufficient to give rise to an outbreak; in turn outbreaks may lead to plague upsurges.

Type
Research Paper
Information
Bulletin of Entomological Research , Volume 59 , Issue 4 , April 1970 , pp. 675 - 680
Copyright
Copyright © Cambridge University Press 1970

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