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Aphids on cabbage: tritrophic and selective insecticide interactions

Published online by Cambridge University Press:  10 July 2009

R.H.J. Verkerk ,
K.R. Neugebauer ,
P.R. Ellis  and
D.J. Wright
R.H.J. Verkerk*
Affiliation:
Department of Biology, Imperial College at Silwood Park, Ascot, Berkshire, SLS 7PY, UK:
K.R. Neugebauer
Affiliation:
Department of Biology, Imperial College at Silwood Park, Ascot, Berkshire, SLS 7PY, UK:
P.R. Ellis
Affiliation:
Horticulture Research International, Wellesbourne, Warwick, CV35 9EF, UK
D.J. Wright
Affiliation:
Department of Biology, Imperial College at Silwood Park, Ascot, Berkshire, SLS 7PY, UK:
*
* Fax: 01344 294 339 E-mail: rverkerk@compuserve.com
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Abstract

Laboratory-based experiments are presented involving two aphid sepcies (Myzus persicae Sulzer, a generalist and Brevicoryne brassicae Linnaeus, a crucifer specialist), and the predatory gall midge, Aphidoletes aphidimyza Rondani, on three cultivars of common cabbage Brassica oleracea var. capitata cv. Derby Day (green-leaved), Minicole (green-leaved) and Ruby Ball (red-leaved). In a laboratory-based tritrophic system including both species of aphid, the three cabbage cultivars and A. aphidimyza, predator both species of aphid, the three feeding on M. persicae or B. brassicae on cv. Derby Day, while growth was slowest separate experiment, A. asphidimyza larva feeding on B. brassicae on each of the three cultivars were significantly smaller and consumed less aphid fresh weight when maintained outdoors (mean temperature = 13.5°C) compared with a constant environment room (20°C). However, in this latter experiment under neither regime were differeneces in predator growth or consumption significant between cultivars. Effects of selective insecticides (pirimicarb and a neem seed kernel extract, NeemAzal-T/SR) on bitrophic (aphid-host plant) interactions were also investigated in the laboratory. A pirimicarb dose equating to c. 15% of the recommended field concentration caused equivalent toxicity of M. persicae on cv. Minicole compared with aphids treated with a three-fold greater dose and reared on cv. Derby Day. Cultivar-mediated differences in aphid mortality caused by the neem extract when tested for systemic and translaminar activity were not apparent. The results are discussed in relation to ways in which host plant selection, selective insecticides and biological control could potentially be manipulated and optimized in aphid management system on brassica crops.

Type
Review Article
Information
Bulletin of Entomological Research , Volume 88 , Issue 3 , June 1998 , pp. 343 - 349
Copyright
Copyright © Cambridge University Press 1998

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