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A preliminary analysis on the effect of copper on Anopheles coluzzii insecticide resistance in vegetable farms in Benin.

Abstract：

:The use of agrochemicals in vegetable production could influence the selection for insecticide resistance in malaria vectors. Unfortunately, there is a dearth of information on the potential contribution of agrochemicals to insecticide resistance in Anopheles mosquitoes breeding on vegetable farms in southern Benin. A Knowledge, Attitudes and Practices study was conducted with 75 vegetable farmers from Houeyiho and Seme to determine the main agrochemicals used in vegetable production, and the concentration and frequency of application, among other details. Mosquitoes and breeding water were sampled from the farms for analysis. Bioassays were conducted on mosquitoes, while breeding water was screened for heavy metal and pesticide residue contamination. Lambda-cyhalothrin was the main insecticide (97.5%) used by farmers, and Anopheles coluzzii was the main mosquito identified. This mosquito species was resistant (30-63% mortality rate) to λ-cyhalothrin. It was also observed that 16.7% of the examined breeding sites were contaminated with λ-cyhalothrin residues. Furthermore, copper contamination detected in mosquito breeding sites showed a positive correlation (r = 0.81; P = 0.0017) with mosquito resistance to λ-cyhalothrin. The presence of copper in λ-cyhalothrin-free breeding sites, where mosquitoes have developed resistance to λ-cyhalothrin, suggests the involvement of copper in the insecticide resistance of malaria vectors; this, however, needs further investigation.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Talom AD,Essoung MA,Gbankoto A,Tchigossou G,Akoton R,Sahabi BBA,Atoyebi SM,Fotso Kuate A,Verspoor RL,Tamò M,Tchuinkam T,Lehman GL,Lines J,Wondji CS,Djouaka R

doi

10.1038/s41598-020-63086-5

subject

Has Abstract

pub_date

2020-04-14 00:00:00

pages

6392

issue

1

issn

2045-2322

pii

10.1038/s41598-020-63086-5

journal_volume

10

pub_type

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