Variation in the susceptibility of Anopheles gambiae to botanicals across a metropolitan region of Nigeria

Pesticide resistance is normally associated with genetic changes, resulting in varied responses to insecticides between different populations. There is little evidence of resistance to plant allelochemicals; it is likely that their efficacy varies between genetically diverse populations, which may l...

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Veröffentlicht in:PloS one 2019-01, Vol.14 (1), p.e0210440
Hauptverfasser: Oladipupo, Seun Olaitan, Callaghan, Amanda, Holloway, Graham J, Gbaye, Olajire Ayodele
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Callaghan, Amanda
Holloway, Graham J
Gbaye, Olajire Ayodele
description Pesticide resistance is normally associated with genetic changes, resulting in varied responses to insecticides between different populations. There is little evidence of resistance to plant allelochemicals; it is likely that their efficacy varies between genetically diverse populations, which may lead to the development of resistance in the future. This study evaluated the response of Anopheles gambiae (larvae and adults) from spatially different populations to acetone extracts of two botanicals, Piper guineense and Eugenia aromatica. Mosquito samples from 10 locations within Akure metropolis in Southwest Nigeria were tested for variation in susceptibility to the toxic effect of botanical extracts. The spatial distribution of the tolerance magnitude (T.M.) of the mosquito populations to the botanicals was also mapped. The populations of An. gambiae manifested significant differences in their level of tolerance to the botanicals. The centre of the metropolis was the hot spot of tolerance to the botanicals. There was a significant positive correlation between the adulticidal activities of both botanicals and initial knockdown. Hence, knockdown by these botanicals could be a predictor of their subsequent mortality. In revealing variation in response to botanical pesticides, our work has demonstrated that any future use of botanicals as alternative environmentally friendly vector control chemicals needs to be closely monitored to ensure that resistance does not develop.
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There is little evidence of resistance to plant allelochemicals; it is likely that their efficacy varies between genetically diverse populations, which may lead to the development of resistance in the future. This study evaluated the response of Anopheles gambiae (larvae and adults) from spatially different populations to acetone extracts of two botanicals, Piper guineense and Eugenia aromatica. Mosquito samples from 10 locations within Akure metropolis in Southwest Nigeria were tested for variation in susceptibility to the toxic effect of botanical extracts. The spatial distribution of the tolerance magnitude (T.M.) of the mosquito populations to the botanicals was also mapped. The populations of An. gambiae manifested significant differences in their level of tolerance to the botanicals. The centre of the metropolis was the hot spot of tolerance to the botanicals. There was a significant positive correlation between the adulticidal activities of both botanicals and initial knockdown. Hence, knockdown by these botanicals could be a predictor of their subsequent mortality. In revealing variation in response to botanical pesticides, our work has demonstrated that any future use of botanicals as alternative environmentally friendly vector control chemicals needs to be closely monitored to ensure that resistance does not develop.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>30625231</pmid><doi>10.1371/journal.pone.0210440</doi><tpages>e0210440</tpages><orcidid>https://orcid.org/0000-0002-2988-5223</orcidid><orcidid>https://orcid.org/0000-0002-2731-3352</orcidid><orcidid>https://orcid.org/0000-0001-8312-7012</orcidid><oa>free_for_read</oa></addata></record>
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subjects Acetone
Adults
Allelochemicals
Animals
Anopheles
Anopheles - drug effects
Anopheles gambiae
Aquatic insects
Biology and Life Sciences
Cities
Control
Cytochrome
Digital archives
Engineering and Technology
Flowers - chemistry
Gene amplification
Gene expression
Genetic variation
Geography
Hot spots
Humidity
Insect control
Insecticide resistance
Insecticide Resistance - drug effects
Insecticides
Larva - drug effects
Larvae
Medicine and Health Sciences
Metropolitan areas
Mosquitoes
Nigeria
Organic chemistry
People and Places
Pesticide resistance
Pesticides
Physical Sciences
Phytochemicals - pharmacology
Population genetics
Populations
Seeds
Seeds - chemistry
Spatial distribution
Tropical diseases
Variation
West Nile virus
Wildlife conservation
title Variation in the susceptibility of Anopheles gambiae to botanicals across a metropolitan region of Nigeria
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