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Factors affecting the response of Longitarsus jacobaeae (Coleoptera: Chrysomelidae) to upwind plant odours

Published online by Cambridge University Press:  10 July 2009

Zhi-Qiang Zhang  and
Peter B. McEvoy
Zhi-Qiang Zhang*
Affiliation:
Department of Entomology, Oregon State University, Corvallis, USA
Peter B. McEvoy
Affiliation:
Department of Entomology, Oregon State University, Corvallis, USA
*
Dr Zhi-Qiang Zhang, International Institute of Entomology, 56 Queen's Gate, London, SW7 5JR, UK.
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Abstract

Factors (developmental state, starvation time, host local density and host distance from insects) affecting the response of the ragwort flea beetle, Longitarsus jacobaeae (Waterhouse), to upwind plants of tansy ragwort, Senecio jacobaeae (Compositae), were examined in a wind tunnel. There was seasonal variation in beetle response to host odours. Individuals collected during spring and early summer (6 May to 14 July 1993) showed directed movement toward the upwind plants. However, individuals collected in mid-summer (23 July 1993) showed no significant response to upwind host plants and walked randomly in the wind tunnel. Individuals collected during late summer to autumn (4 August to 23 October 1994) once again showed response to upwind plants, whereas those collected in winter (January 1994) walked randomly in the wind tunnel. The absence of beetle response to plant odours coincided with potential summer aestivation and winter ‘hibernation’. For spring and early summer beetles that responded to plant odours, the strength of the response did not change significantly with the number of plants (1, 2, 4 or 6) presented upwind in the tunnel nor with the starvation time (2, 6, 10, 12, 24 or 36 h) of the tested beetles, and these patterns were consistent for male and female beetles. Individuals responded to plants from a distance of 60 and 300 cm. The speed of movement, similar for males and females, increased slightly as L. jacobaeae oriented more directly toward host plants.

Type
Review Article
Information
Bulletin of Entomological Research , Volume 86 , Issue 3 , June 1996 , pp. 307 - 313
Copyright
Copyright © Cambridge University Press 1996

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