Efficacy of extended release formulations of Natular™ (spinosad) against larvae and adults of Anopheles mosquitoes in western Kenya
Rattachement africain : us, Kenya. Niveau de preuve : code pays fourni par la source.
Le résumé fourni par la source
BACKGROUND: Larval source management is recommended as a supplementary vector control measure for the prevention of malaria. Among the concerns related to larviciding is the feasibility of implementation in tropical areas with large numbers of habitats and the need for frequent application. Formulated products of spinosad that are designed to be effective for several weeks may mitigate some of these concerns. METHODS: In a semi-field study, three formulations of spinosad (emulsifiable concentrate, extended release granules and tablet formulations) were tested in naturalistic habitats in comparison to an untreated control. Cohorts of third instar Anopheles gambiae (Diptera: Culicidae) were introduced into the habitats in screened cages every week up to four weeks after application and monitored for survivorship over three days. A small-scale field trial was then conducted in two villages. Two of the spinosad formulations were applied in one village over the course of 18 months. Immature mosquito populations were monitored with standard dippers in sentinel sites and adult populations were monitored by pyrethrum spray catches. RESULTS: In the semi-field study, the efficacy of the emulsifiable concentrate of spinosad waned 1 week after treatment. Mortality in habitats treated with the extended release granular formulation of spinosad was initially high but declined gradually over 4 weeks while mortality in habitats treated with the dispersable tablet formulation was low immediately after treatment but rose to 100% through four weeks. In the field study, immature and adult Anopheles mosquito populations were significantly lower in the intervention village compared to the control village during the larviciding period. Numbers of collected mosquitoes were lower in the intervention village compared to the control village during the post-intervention period but the difference was not statistically significant. CONCLUSIONS: The extended release granular formulation and the dispersible tablet formulations of spinosad are effective against larval Anopheles mosquitoes for up to four weeks and may be an effective tool as part of larval source management programmes for reducing adult mosquito density and malaria transmission.
Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.
Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Efficacy of extended release formulations of Natular™ (spinosad) against larvae and adults of Anopheles mosquitoes in western Kenya
- Date Crossref
- 26/11/2020
- Éditeur
- Springer Science and Business Media LLC
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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Centers for Disease Control and Prevention pays non établi dans la noticeOrganisme public
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Division of Parasitic Diseases and Malaria pays non établi dans la noticeStructure de recherche
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Kenya Medical Research Institute Kisumu, Kenya (code pays fourni par la source)Structure de recherche
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Abt Global (United States) pays non établi dans la noticeEntreprise
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Florida Medical Entomology Laboratory pays non établi dans la noticeÉtablissement de santé
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Clarke (United States) pays non établi dans la noticeEntreprise
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Michigan State University Department of Microbiology and Molecular Genetics pays non établi dans la noticeUniversité ou école supérieure
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PMI VectorLink Project Lusaka, Zambie (pays nommé en fin d’affiliation)Institution
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University of Florida Florida Medical Entomological Laboratory pays non établi dans la noticeUniversité ou école supérieure
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Clarke International pays non établi dans la noticeInstitution
Centers for Disease Control and Prevention, Division of Parasitic Diseases and Malaria et Kenya Medical Research Institute (Kisumu, Kenya), avec 7 autres affiliations. Pays d’affiliation : Kenya, Zambie.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.