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The significance of proleg disruption by chlordimeform to sublethal control of larvae of Pieris brassicae (L.) (Lepidoptera: Pieridae) in the field

Published online by Cambridge University Press:  10 July 2009

Alison Blackwell
Alison Blackwell
Affiliation:
Department of Zoology, University of Bristol, Woodland Road, Bristol, BS8 1UG, UK
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Abstract

The results of field trials in the UK are reported, investigating the hypothesis that the disruption of proleg clasping in lepidopteran larvae by sublethal doses of the formamidine pesticide chlordimeform contributes significantly to a control mechanism. Pieris brassicae (L.) was used as a model pest. Topically dosed third-instar larvae, placed on cabbage plants, became excited and many fell. Although the behavioural symptoms were reversible within 24 h, fallen larvae rarely re-established themselves on the plants. The ED50 halving the initial population was similar to the ED50 for proleg disruption, emphasizing the importance of the latter as a major cause of the former. Arthropod or bird predation was not shown to increase following chlordimeform treatment. However, inclement weather did enhance the detaching effect of treatment and also its delayed effects on larval development and survival.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 78 , Issue 4 , December 1988 , pp. 613 - 621
Copyright
Copyright © Cambridge University Press 1988

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