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The production of distribution maps of the incubation and hopper development periods of the desert locust Schistocerca gregaria (Forsk.) (Orthoptera, Acrididae)

Published online by Cambridge University Press:  10 July 2009

P. M. Symmons ,
S. M. Green ,
R. A. Robertson  and
K. G. Wardhaugh
P. M. Symmons
Affiliation:
Centre for Overseas Pest Research, College House, Wrights Lane, London W8 5SJ
S. M. Green
Affiliation:
Centre for Overseas Pest Research, College House, Wrights Lane, London W8 5SJ
R. A. Robertson
Affiliation:
Centre for Overseas Pest Research, College House, Wrights Lane, London W8 5SJ
K. G. Wardhaugh
Affiliation:
Centre for Overseas Pest Research, College House, Wrights Lane, London W8 5SJ
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Abstract

This paper describes the method used to produce maps of the incubation and hopper development periods of the desert locust Schistocerca gregaria (Forsk.). From these maps it is possible to calculate the likely development periods of eggs and hoppers for, respectively, laying and hatching on any date and at any place within the invasion area of the species. Maps could not be based on actual observations of development periods because such observations are few in number, irregular in distribution and are not for standard dates. Instead, expected mean development periods for laying and hatching on the first of each month were calculated for a large number of meteorological stations for which long-term mean temperatures were available, using relationships between the rates of development and mean daily screen temperatures. These relationships were, in the main, derived from earlier work by one of the authors (K.G.W.) and his associates. Some assessment has been made of the accuracy of development periods derived from the maps.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 64 , Issue 3 , November 1974 , pp. 443 - 451
Copyright
Copyright © Cambridge University Press 1974

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References

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