Rapid evolution of insecticide resistance and patterns of pesticides usage in agriculture in the city of Yaoundé, Cameroon

Autor: Nadège Sonhafouo-Chiana, Leslie Diane Nkahe, Edmond Kopya, Parfait Herman Awono-Ambene, Samuel Wanji, Charles Sinclair Wondji, Christophe Antonio-Nkondjio
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Parasites & Vectors, Vol 15, Iss 1, Pp 1-15 (2022)
Druh dokumentu: article
ISSN: 1756-3305
DOI: 10.1186/s13071-022-05321-8
Popis: Abstract Background The practice of agriculture in urban settings contributes to the rapid expansion of insecticide resistance in malaria vectors. However, there is still not enough information on pesticide usage in most urban settings. The present study aims to assess the evolution of Anopheles gambiae (s.l.) population susceptibility to insecticides and patterns of pesticide usage in agriculture in the city of Yaoundé, Cameroon. Methods WHO susceptibility tests and synergist PBO bioassays were conducted on adult An. gambiae (s.l.) mosquitoes aged 3 to 5 days emerging from larvae collected from the field. Seven insecticides (deltamethrin, permethrin, DDT, bendiocarb, propoxur, fenitrothion and malathion) were evaluated. The presence of target site mutation conferring knockdown (kdr) resistance was investigated using TaqMan assay, and mosquito species were identified using SINE-PCR. Surveys on 81 retailers and 232 farmers were conducted to assess general knowledge and practices regarding agricultural pesticide usage. Results High resistance intensity to pyrethroids was observed with a high frequency of the kdr allele 1014F and low frequency of the kdr 1014S allele. The level of susceptibility of An. gambiae (s.l.) to pyrethroids and carbamates was found to decrease with time (from > 34% in 2017 to
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