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Some factors affecting the efficiency of sticky board traps for capturing the carrot fly, Psila rosae (Diptera: Psilidae)

Published online by Cambridge University Press:  10 July 2009

Rosemary H. Collier
Affiliation:
AFRC Institute of Horticultural Research, Wellesbourne, Warwick, UK
S. Finch
Affiliation:
AFRC Institute of Horticultural Research, Wellesbourne, Warwick, UK

Abstract

The relative attractiveness of coloured sticky board traps to the carrot fly (Psila rosae (Fabricius)) is described by a model in which fly catch is related positively to the amount of light reflected from the trap in the green-yellow (550–570 nm) band of the spectrum and negatively to the amount reflected in the violet-green (390–550 nm) band. The model allows the performance of new coloured traps to be predicted solely from spectral reflectivity measurements. Similar numbers of carrot flies were caught/unit area on traps varying in size from 150 cm2 to 4800 cm2. Most flies were caught on traps resting on the ground. The number of flies caught was reduced by 0.84% for each cm the trap was raised above 10 cm from the ground. One-sided sticky traps angled at 45° to the vertical doubled the numbers of carrot flies caught/unit trapping area and reduced by 90% the numbers of non-target species caught.

Type
Original Articles
Copyright
Copyright © Cambridge University Press 1990

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