Tri-Trophic Insecticidal Effects of African Plants against Cabbage Pests

Botanical insecticides are increasingly attracting research attention as they offer novel modes of action that may provide effective control of pests that have already developed resistance to conventional insecticides. They potentially offer cost-effective pest control to smallholder farmers in deve...

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Main Authors:	Amoabeng, Blankson W., Gurr, Geoff M., Gitau, Catherine W., Nicol, Helen I., Munyakazi, Louis, Stevenson, Phil C.
Format:	Online
Language:	English
Published:	Public Library of Science 2013
Online Access:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3812033/

id	pubmed-3812033
recordtype	oai_dc
spelling	pubmed-38120332013-11-07 Tri-Trophic Insecticidal Effects of African Plants against Cabbage Pests Amoabeng, Blankson W. Gurr, Geoff M. Gitau, Catherine W. Nicol, Helen I. Munyakazi, Louis Stevenson, Phil C. Research Article Botanical insecticides are increasingly attracting research attention as they offer novel modes of action that may provide effective control of pests that have already developed resistance to conventional insecticides. They potentially offer cost-effective pest control to smallholder farmers in developing countries if highly active extracts can be prepared simply from readily available plants. Field cage and open field experiments were conducted to evaluate the insecticidal potential of nine common Ghanaian plants: goat weed, Ageratum conyzoides (Asteraceae), Siam weed, Chromolaena odorata (Asteraceae), Cinderella weed, Synedrella nodiflora (Asteraceae), chili pepper, Capsicum frutescens (Solanaceae), tobacco, Nicotiana tabacum (Solanaceae) cassia, Cassia sophera (Leguminosae), physic nut, Jatropha curcas (Euphorbiaceae), castor oil plant, Ricinus communis (Euphorbiaceae) and basil, Ocimum gratissimum (Lamiaceae). In field cage experiments, simple detergent and water extracts of all botanical treatments gave control of cabbage aphid, Brevicoryne brassicae and diamondback moth, Plutella xylostella, equivalent to the synthetic insecticide Attack® (emamectin benzoate) and superior to water or detergent solution. In open field experiments in the major and minor rainy seasons using a sub-set of plant extracts (A. conyzoides, C. odorata, S. nodiflora, N. tabacum and R. communis), all controlled B. brassicae and P. xylostella more effectively than water control and comparably with or better than Attack®. Botanical and water control treatments were more benign to third trophic level predators than Attack®. Effects cascaded to the first trophic level with all botanical treatments giving cabbage head weights, comparable to Attack® in the minor season. In the major season, R. communis and A conyzoides treatment gave lower head yields than Attack® but the remaining botanicals were equivalent or superior to this synthetic insecticide. Simply-prepared extracts from readily-available Ghanaian plants give beneficial, tri-trophic benefits and merit further research as an inexpensive plant protection strategy for smallholder farmers in West Africa. Public Library of Science 2013-10-24 /pmc/articles/PMC3812033/ /pubmed/24205287 http://dx.doi.org/10.1371/journal.pone.0078651 Text en © 2013 Amoabeng et al http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
repository_type	Open Access Journal
institution_category	Foreign Institution
institution	US National Center for Biotechnology Information
building	NCBI PubMed
collection	Online Access
language	English
format	Online
author	Amoabeng, Blankson W. Gurr, Geoff M. Gitau, Catherine W. Nicol, Helen I. Munyakazi, Louis Stevenson, Phil C.
spellingShingle	Amoabeng, Blankson W. Gurr, Geoff M. Gitau, Catherine W. Nicol, Helen I. Munyakazi, Louis Stevenson, Phil C. Tri-Trophic Insecticidal Effects of African Plants against Cabbage Pests
author_facet	Amoabeng, Blankson W. Gurr, Geoff M. Gitau, Catherine W. Nicol, Helen I. Munyakazi, Louis Stevenson, Phil C.
author_sort	Amoabeng, Blankson W.
title	Tri-Trophic Insecticidal Effects of African Plants against Cabbage Pests
title_short	Tri-Trophic Insecticidal Effects of African Plants against Cabbage Pests
title_full	Tri-Trophic Insecticidal Effects of African Plants against Cabbage Pests
title_fullStr	Tri-Trophic Insecticidal Effects of African Plants against Cabbage Pests
title_full_unstemmed	Tri-Trophic Insecticidal Effects of African Plants against Cabbage Pests
title_sort	tri-trophic insecticidal effects of african plants against cabbage pests
description	Botanical insecticides are increasingly attracting research attention as they offer novel modes of action that may provide effective control of pests that have already developed resistance to conventional insecticides. They potentially offer cost-effective pest control to smallholder farmers in developing countries if highly active extracts can be prepared simply from readily available plants. Field cage and open field experiments were conducted to evaluate the insecticidal potential of nine common Ghanaian plants: goat weed, Ageratum conyzoides (Asteraceae), Siam weed, Chromolaena odorata (Asteraceae), Cinderella weed, Synedrella nodiflora (Asteraceae), chili pepper, Capsicum frutescens (Solanaceae), tobacco, Nicotiana tabacum (Solanaceae) cassia, Cassia sophera (Leguminosae), physic nut, Jatropha curcas (Euphorbiaceae), castor oil plant, Ricinus communis (Euphorbiaceae) and basil, Ocimum gratissimum (Lamiaceae). In field cage experiments, simple detergent and water extracts of all botanical treatments gave control of cabbage aphid, Brevicoryne brassicae and diamondback moth, Plutella xylostella, equivalent to the synthetic insecticide Attack® (emamectin benzoate) and superior to water or detergent solution. In open field experiments in the major and minor rainy seasons using a sub-set of plant extracts (A. conyzoides, C. odorata, S. nodiflora, N. tabacum and R. communis), all controlled B. brassicae and P. xylostella more effectively than water control and comparably with or better than Attack®. Botanical and water control treatments were more benign to third trophic level predators than Attack®. Effects cascaded to the first trophic level with all botanical treatments giving cabbage head weights, comparable to Attack® in the minor season. In the major season, R. communis and A conyzoides treatment gave lower head yields than Attack® but the remaining botanicals were equivalent or superior to this synthetic insecticide. Simply-prepared extracts from readily-available Ghanaian plants give beneficial, tri-trophic benefits and merit further research as an inexpensive plant protection strategy for smallholder farmers in West Africa.
publisher	Public Library of Science
publishDate	2013
url	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3812033/
_version_	1612021583437627392

Tri-Trophic Insecticidal Effects of African Plants against Cabbage Pests

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