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Monitoring wheat bulb fly, Delia coarctata (Fallén) (Diptera: Anthomyiidae), with light-traps

Published online by Cambridge University Press:  10 July 2009

John Bowden  and
Margaret G. Jones
John Bowden
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts. AL5 2JQ, UK.
Margaret G. Jones
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts. AL5 2JQ, UK.
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Abstract

The flight activity of adult Delia coarctata (Fall). was studied on Rothamsted Farm from 1969 to 1977 using light-traps. These catch, almost exclusively, dispersing mature females, more being caught at full moon than at new moon. Dispersal begins in response to an acceleration in the rate of decrease of daylength, and at Rothamsted begins on 10 July, soon after the rate of decrease accelerates. Maturation of eggs is controlled by temperature; at Rothamsted, the first mature females appear when temperature accumulation above 5° C has reached 314·5±10·5° after 12 June. Maturation usually coincides with dispersal, but females that have matured before 10 July do not disperse until after that date. Catches of females in light-traps are correlated with the numbers of emerging females per hectare and the numbers of eggs per hectare. Light-traps could be used as a simple way of forecasting numbers of eggs early enough to give advice on seed treatment for winter wheat on land subject to attack by D. coarctata.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 69 , Issue 1 , April 1979 , pp. 129 - 139
Copyright
Copyright © Cambridge University Press 1979

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