caa a22 4500 388035978 CHVBK 20180307125004.0 cr unu---uuuuu 161130e199806 xx s 000 0 eng 10.1017/S0007485300025967 doi S0007485300025967 pii (NATIONALLICENCE)cambridge-10.1017/S0007485300025967 Aphids on cabbage: tritrophic and selective insecticide interactions [Elektronische Daten] 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. Copyright © Cambridge University Press 1998 Verkerk R.H.J. Department of Biology, Imperial College at Silwood Park, Ascot, Berkshire, SLS 7PY, UK Neugebauer K.R. Department of Biology, Imperial College at Silwood Park, Ascot, Berkshire, SLS 7PY, UK Ellis P.R. Horticulture Research International, Wellesbourne, Warwick, CV35 9EF, UK Wright D.J. Department of Biology, Imperial College at Silwood Park, Ascot, Berkshire, SLS 7PY, UK Bulletin of Entomological Research Cambridge University Press 88/3(1998-06), 343-349 0007-4853 88:3<343 1998 88 BER https://doi.org/10.1017/S0007485300025967 text/html Onlinezugriff via DOI 1 review-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0007485300025967 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Verkerk R.H.J. Department of Biology, Imperial College at Silwood Park, Ascot, Berkshire, SLS 7PY, UK NATIONALLICENCE 700 1- Neugebauer K.R. Department of Biology, Imperial College at Silwood Park, Ascot, Berkshire, SLS 7PY, UK NATIONALLICENCE 700 1- Ellis P.R. Horticulture Research International, Wellesbourne, Warwick, CV35 9EF, UK NATIONALLICENCE 700 1- Wright D.J. Department of Biology, Imperial College at Silwood Park, Ascot, Berkshire, SLS 7PY, UK NATIONALLICENCE 773 0- Bulletin of Entomological Research Cambridge University Press 88/3(1998-06), 343-349 0007-4853 88:3<343 1998 88 BER CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge