Biological and residual activity of candidate larvicide formulation, SumiLarv 2MR, against an exotic invasive mosquito Anopheles stephensi Liston, 1901 (Diptera: Culicidae) in Ethiopia
Abstract The study evaluated the efficacy and residual activity of SumiLarv 2MR, SumiLarv 0.5G, and Abate 1SG (used as a positive control) against Anopheles stephensi larvae in Awash Subath Kilo, Afar Regional State, Ethiopia, using a semi-field experimental setup. Plastic containers with capacities...
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Nature Portfolio
2025-01-01
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| Online Access: | https://doi.org/10.1038/s41598-024-80019-8 |
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| author | Delenasaw Yewhalaw Ebisa Erena Teshome Degefa Yehenew G. Kifle Endalew Zemene Eba Alemayehu Simma |
| author_facet | Delenasaw Yewhalaw Ebisa Erena Teshome Degefa Yehenew G. Kifle Endalew Zemene Eba Alemayehu Simma |
| author_sort | Delenasaw Yewhalaw |
| collection | DOAJ |
| description | Abstract The study evaluated the efficacy and residual activity of SumiLarv 2MR, SumiLarv 0.5G, and Abate 1SG (used as a positive control) against Anopheles stephensi larvae in Awash Subath Kilo, Afar Regional State, Ethiopia, using a semi-field experimental setup. Plastic containers with capacities of 100L and 250L were used to assess the residual efficacy of SumiLarv 2MR. Specifically, four 100L containers were each treated with one disc of SumiLarv 2MR, compared to two untreated controls. Similarly, four 250L containers received one disc each, with two untreated controls. Additionally, eight 250L containers were treated with a half-dose to match one disc per 500L, alongside four untreated controls. For SumiLarv 0.5G and Abate 1SG, four 100L containers were treated with each larvicide, with two untreated controls for each. Each container received 20–25 third and fourth instar An. stephensi larvae. Observations of adult emergence were conducted until all pupae either emerged or died. Results showed that SumiLarv 2MR demonstrated a nine-month residual efficacy, SumiLarv 0.5G provided seven weeks of efficacy, and Abate 1SG showed a five-week efficacy. Additionally, SumiLarv 2MR discs retained nearly 50% of their initial pyriproxyfen content after nine months, suggesting potential for extended residual activity. This study highlights the long-term effectiveness of SumiLarv 2MR’s as a larvicide against An. stephensi in Ethiopia. |
| format | Article |
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| institution | Kabale University |
| issn | 2045-2322 |
| language | English |
| publishDate | 2025-01-01 |
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| series | Scientific Reports |
| spelling | doaj-art-2d8cee112b2945edaf05a6ed04b9dc522025-01-05T12:18:37ZengNature PortfolioScientific Reports2045-23222025-01-011511910.1038/s41598-024-80019-8Biological and residual activity of candidate larvicide formulation, SumiLarv 2MR, against an exotic invasive mosquito Anopheles stephensi Liston, 1901 (Diptera: Culicidae) in EthiopiaDelenasaw Yewhalaw0Ebisa Erena1Teshome Degefa2Yehenew G. Kifle3Endalew Zemene4Eba Alemayehu Simma5School of Medical Laboratory Sciences, Institute of Health, Jimma UniversityDepartement of Biology, College of Natural Sciences, Jimma UniversitySchool of Medical Laboratory Sciences, Institute of Health, Jimma UniversityDepartment of Mathematics and Statistics, University of Maryland Baltimore County (UMBC)School of Medical Laboratory Sciences, Institute of Health, Jimma UniversityDepartement of Biology, College of Natural Sciences, Jimma UniversityAbstract The study evaluated the efficacy and residual activity of SumiLarv 2MR, SumiLarv 0.5G, and Abate 1SG (used as a positive control) against Anopheles stephensi larvae in Awash Subath Kilo, Afar Regional State, Ethiopia, using a semi-field experimental setup. Plastic containers with capacities of 100L and 250L were used to assess the residual efficacy of SumiLarv 2MR. Specifically, four 100L containers were each treated with one disc of SumiLarv 2MR, compared to two untreated controls. Similarly, four 250L containers received one disc each, with two untreated controls. Additionally, eight 250L containers were treated with a half-dose to match one disc per 500L, alongside four untreated controls. For SumiLarv 0.5G and Abate 1SG, four 100L containers were treated with each larvicide, with two untreated controls for each. Each container received 20–25 third and fourth instar An. stephensi larvae. Observations of adult emergence were conducted until all pupae either emerged or died. Results showed that SumiLarv 2MR demonstrated a nine-month residual efficacy, SumiLarv 0.5G provided seven weeks of efficacy, and Abate 1SG showed a five-week efficacy. Additionally, SumiLarv 2MR discs retained nearly 50% of their initial pyriproxyfen content after nine months, suggesting potential for extended residual activity. This study highlights the long-term effectiveness of SumiLarv 2MR’s as a larvicide against An. stephensi in Ethiopia.https://doi.org/10.1038/s41598-024-80019-8SumiLarv 2MRSumiLarv 0.5GAnopheles stephensiEthiopia |
| spellingShingle | Delenasaw Yewhalaw Ebisa Erena Teshome Degefa Yehenew G. Kifle Endalew Zemene Eba Alemayehu Simma Biological and residual activity of candidate larvicide formulation, SumiLarv 2MR, against an exotic invasive mosquito Anopheles stephensi Liston, 1901 (Diptera: Culicidae) in Ethiopia Scientific Reports SumiLarv 2MR SumiLarv 0.5G Anopheles stephensi Ethiopia |
| title | Biological and residual activity of candidate larvicide formulation, SumiLarv 2MR, against an exotic invasive mosquito Anopheles stephensi Liston, 1901 (Diptera: Culicidae) in Ethiopia |
| title_full | Biological and residual activity of candidate larvicide formulation, SumiLarv 2MR, against an exotic invasive mosquito Anopheles stephensi Liston, 1901 (Diptera: Culicidae) in Ethiopia |
| title_fullStr | Biological and residual activity of candidate larvicide formulation, SumiLarv 2MR, against an exotic invasive mosquito Anopheles stephensi Liston, 1901 (Diptera: Culicidae) in Ethiopia |
| title_full_unstemmed | Biological and residual activity of candidate larvicide formulation, SumiLarv 2MR, against an exotic invasive mosquito Anopheles stephensi Liston, 1901 (Diptera: Culicidae) in Ethiopia |
| title_short | Biological and residual activity of candidate larvicide formulation, SumiLarv 2MR, against an exotic invasive mosquito Anopheles stephensi Liston, 1901 (Diptera: Culicidae) in Ethiopia |
| title_sort | biological and residual activity of candidate larvicide formulation sumilarv 2mr against an exotic invasive mosquito anopheles stephensi liston 1901 diptera culicidae in ethiopia |
| topic | SumiLarv 2MR SumiLarv 0.5G Anopheles stephensi Ethiopia |
| url | https://doi.org/10.1038/s41598-024-80019-8 |
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