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Susceptibility of South Texas Aedes aegypti to Pyriproxyfen

SIMPLE SUMMARY: We evaluated the susceptibility of an Ae. aegypti strain from the Lower Rio Grande Valley (LRGV) of South Texas to the insect growth regulator pyriproxyfen. We observed a difference in the inhibition of emergence to the lowest doses of pyriproxyfen tested between our field strain and...

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Autores principales: Juarez, Jose G., Garcia-Luna, Selene M., Roundy, Christopher M., Branca, Alyssa, Banfield, Michael G., Hamer, Gabriel L.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8157070/
https://www.ncbi.nlm.nih.gov/pubmed/34067509
http://dx.doi.org/10.3390/insects12050460
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author Juarez, Jose G.
Garcia-Luna, Selene M.
Roundy, Christopher M.
Branca, Alyssa
Banfield, Michael G.
Hamer, Gabriel L.
author_facet Juarez, Jose G.
Garcia-Luna, Selene M.
Roundy, Christopher M.
Branca, Alyssa
Banfield, Michael G.
Hamer, Gabriel L.
author_sort Juarez, Jose G.
collection PubMed
description SIMPLE SUMMARY: We evaluated the susceptibility of an Ae. aegypti strain from the Lower Rio Grande Valley (LRGV) of South Texas to the insect growth regulator pyriproxyfen. We observed a difference in the inhibition of emergence to the lowest doses of pyriproxyfen tested between our field strain and a susceptible strain. However, the doses used are 10 times lower from the recommended application of <50 ppb for vector control programs. Our results suggest that pyriproxyfen should be an effective active ingredient in the LRGV to help reduce Ae. aegypti populations in the LRGV. ABSTRACT: An integral part to integrated mosquito management is to ensure chemical products used for area-wide control are effective against a susceptible population of mosquitoes. Prior to conducting an intervention trial using an insect growth regulator, pyriproxyfen, in South Texas to control Aedes aegypti, we conducted a larval bioassay to evaluate baseline levels of susceptibility. We used seven serially-diluted doses ranging from 2.5 ppb to 6.3 × 10(−4) ppb. We observed 100% inhibition emergence (IE) at even the lowest dose of 6.3 × 10(−4) ppb in our susceptible reference colony of Ae. aegypti Liverpool. In our field strain of Ae. aegypti (F5 colonized from South Texas) we observed 79.8% IE at 6.3 × 10(−4) ppb, 17.7% IE at 1.25 × 10(−3) ppb, 98.7% IE at 1.25 × 10(−2) ppb, and 100% emergence inhibition for the remainder of the doses. Given that commercial pyriproxyfen products are labeled for doses ranging to 50 ppb, we conclude that the field population sampled by this study are susceptible to this insect growth regulator.
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spelling pubmed-81570702021-05-28 Susceptibility of South Texas Aedes aegypti to Pyriproxyfen Juarez, Jose G. Garcia-Luna, Selene M. Roundy, Christopher M. Branca, Alyssa Banfield, Michael G. Hamer, Gabriel L. Insects Brief Report SIMPLE SUMMARY: We evaluated the susceptibility of an Ae. aegypti strain from the Lower Rio Grande Valley (LRGV) of South Texas to the insect growth regulator pyriproxyfen. We observed a difference in the inhibition of emergence to the lowest doses of pyriproxyfen tested between our field strain and a susceptible strain. However, the doses used are 10 times lower from the recommended application of <50 ppb for vector control programs. Our results suggest that pyriproxyfen should be an effective active ingredient in the LRGV to help reduce Ae. aegypti populations in the LRGV. ABSTRACT: An integral part to integrated mosquito management is to ensure chemical products used for area-wide control are effective against a susceptible population of mosquitoes. Prior to conducting an intervention trial using an insect growth regulator, pyriproxyfen, in South Texas to control Aedes aegypti, we conducted a larval bioassay to evaluate baseline levels of susceptibility. We used seven serially-diluted doses ranging from 2.5 ppb to 6.3 × 10(−4) ppb. We observed 100% inhibition emergence (IE) at even the lowest dose of 6.3 × 10(−4) ppb in our susceptible reference colony of Ae. aegypti Liverpool. In our field strain of Ae. aegypti (F5 colonized from South Texas) we observed 79.8% IE at 6.3 × 10(−4) ppb, 17.7% IE at 1.25 × 10(−3) ppb, 98.7% IE at 1.25 × 10(−2) ppb, and 100% emergence inhibition for the remainder of the doses. Given that commercial pyriproxyfen products are labeled for doses ranging to 50 ppb, we conclude that the field population sampled by this study are susceptible to this insect growth regulator. MDPI 2021-05-17 /pmc/articles/PMC8157070/ /pubmed/34067509 http://dx.doi.org/10.3390/insects12050460 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Brief Report
Juarez, Jose G.
Garcia-Luna, Selene M.
Roundy, Christopher M.
Branca, Alyssa
Banfield, Michael G.
Hamer, Gabriel L.
Susceptibility of South Texas Aedes aegypti to Pyriproxyfen
title Susceptibility of South Texas Aedes aegypti to Pyriproxyfen
title_full Susceptibility of South Texas Aedes aegypti to Pyriproxyfen
title_fullStr Susceptibility of South Texas Aedes aegypti to Pyriproxyfen
title_full_unstemmed Susceptibility of South Texas Aedes aegypti to Pyriproxyfen
title_short Susceptibility of South Texas Aedes aegypti to Pyriproxyfen
title_sort susceptibility of south texas aedes aegypti to pyriproxyfen
topic Brief Report
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8157070/
https://www.ncbi.nlm.nih.gov/pubmed/34067509
http://dx.doi.org/10.3390/insects12050460
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