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221971

Comparative Evaluation of Larvicides for Larval Source Management of Mosquitoes in Lagos, Nigeria.

Article

Last updated: 03 Jan 2025

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Abstract

The use of larval source management (LSM) in sub-Saharan Africa is limited, however, widespread report of insecticide resistance in adult mosquitoes has engendered renewed interest in LSM; especially larviciding. Hence, this study evaluated bioefficacy and residual efficacy of commercially available larvicides;Temephos, Spinosad, Bacillus thuringiensis var. isrealensis (Bti) and Bacillus thuringiensis var. israelensis/Bacillus sphaericus (Bti/Bs) on larvae of Anopheles gambiae s.l, Culex quinquefasciatus and Aedes aegypti in Lagos, Nigeria. Acute toxicity assay was used to determine LC95 and the LC95 was doubled to determine discriminating doses. Residual efficacy was assessed by exposing larvae to discriminating doses of larvicides in deionised water and in water collected from larval habitat for 28 days and 24 hr mortality post-introduction of larvae was checked for 2nd, 4th, 7th, 14th, 21st and 28th day. Probit analysis was used to estimate LC95 and residual efficacy at mortality ≥95%. T-Test was used to determine the level of significance (P<0.05) of the residual effect. Temephos (0.007mg/l) was the most toxic considering 24h LC95. The trend of LC95 (Temephos < Spinosad < Bti/Bs < Bti) in Anopheles gambiae s.l was the same for Culex quinquefasciatus and Aedes aegypti. Residual effect of Bti/Bs > Bti > Temephos > Spinosad on mosquito larvae from Lagos, Nigeria. The trend of residual efficacy is the same in both bioassays albeit reduced when larvicides were dissolved in water collected from larval habitats. Strong bioefficacy and better residual capacity of Bti/Bs make it a better larviciding agent against Anopheles gambiae s.l, Culex quinquefasciatus and Aedes aegypti in Lagos, Nigeria.

DOI

10.21608/eajbsa.2022.221971

Keywords

Larval source management, larvicides, Mosquito larvae, bioefficacy, Residual efficacy

Authors

First Name

Fouad

Last Name

Adetoro

MiddleName

A.

Affiliation

Department of Zoology, University of Lagos, Akoka, Yaba, Lagos, Nigeria.

Email

adetorofouad@gmail.com

City

-

Orcid

-

First Name

Joe

Last Name

Anikwe

MiddleName

C.

Affiliation

Department of Zoology, University of Lagos, Akoka, Yaba, Lagos, Nigeria

Email

-

City

-

Orcid

-

First Name

Winifred

Last Name

Makanjuola

MiddleName

A.

Affiliation

Department of Zoology, University of Lagos, Akoka, Yaba, Lagos, Nigeria

Email

-

City

-

Orcid

-

First Name

Ahmed

Last Name

Omotayo

MiddleName

I.

Affiliation

Department of Public Health and Epidemiology, Nigeria Institute of Medical Research, Yaba, Lagos, Nigeria. P.M.B 2013, Yaba, Lagos, Nigeria

Email

-

City

-

Orcid

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First Name

Samson

Last Name

Awolola

MiddleName

T.

Affiliation

Department of Public Health and Epidemiology, Nigeria Institute of Medical Research, Yaba, Lagos, Nigeria. P.M.B 2013, Yaba, Lagos, Nigeria

Email

-

City

-

Orcid

-

Volume

15

Article Issue

1

Related Issue

29905

Issue Date

2022-03-01

Receive Date

2022-01-12

Publish Date

2022-03-01

Page Start

33

Page End

46

Print ISSN

1687-8809

Online ISSN

2090-0813

Link

https://eajbsa.journals.ekb.eg/article_221971.html

Detail API

https://eajbsa.journals.ekb.eg/service?article_code=221971

Order

4

Type

Original Article

Type Code

667

Publication Type

Journal

Publication Title

Egyptian Academic Journal of Biological Sciences. A, Entomology

Publication Link

https://eajbsa.journals.ekb.eg/

MainTitle

Comparative Evaluation of Larvicides for Larval Source Management of Mosquitoes in Lagos, Nigeria.

Details

Type

Article

Created At

22 Jan 2023