Abstract
Using Pyriproxyfen in controlling Aedes aegypti shows great potential considering its high competence in low dosages. As an endocrine disruptor, temperature can interfere with its efficiency, related to a decrease in larval emergence inhibition in hotter environments. However, previous studies have been performed at constant temperatures in the laboratory, which may not precisely reflect the environmental conditions in the field. The aim of this study was to assess the effect of the fluctuating temperatures in Pyriproxyfen efficiency on controlling Aedes aegypti larvae. We selected maximum and minimum temperatures from the Brazilian Meteorological Institute database from September to April for cities grouped by five regions. Five fluctuating temperatures (17–26; 20–28.5; 23–32.5; 23–30.5; 19.5–31 °C) were applied to bioassays assessing Pyriproxyfen efficiency in preventing adult emergence in Aedes aegypti larvae in five concentrations. In the lowest temperatures, the most diluted Pyriproxyfen treatment (0.0025 mg/L) was efficient in preventing the emergence of almost thrice the larvae than in the hottest temperatures (61% and 21%, respectively, p value = 0.00015). The concentration that inhibits the emergence of 50% of the population was lower than that preconized by the World Health Organization (0.01 mg/L) in all treatments, except for the hottest temperatures, for which we estimated 0.010 mg/L. We concluded that fluctuating temperatures in laboratory bioassays can provide a more realistic result to integrate the strategies in vector surveillance. For a country with continental proportions such as Brazil, considering regionalities is crucial to the rational use of insecticides.
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Data availability
The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
We are grateful to Ivan Bortoli and Driélen Conceição from the Analytical and Scientific Research Labs who kindly provided the Aedes aegypti eggs from Rockefeller strain. We thank Valter Iost, for providing the larvicide.
Funding
This study was financed in part by the Coordination for the Improvement of Higher Education Personnel, CAPES (Grant number 88887.352964/2019-00), from the Brazilian Ministry of Education.
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LM: conceptualization, methodology, investigation, formal analysis, data visualization, writing—original draft. JJC: validation, resources, data curation, writing—review and editing, supervision, project administration, funding acquisition. Both authors read and approved the final manuscript.
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Moura, L., Corbi, J.J. Regionality in vector control: effect of fluctuating temperature in the susceptibility of Aedes aegypti (Diptera: Culicidae) larvae to Pyriproxyfen. Parasitol Res 123, 23 (2024). https://doi.org/10.1007/s00436-023-08065-1
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DOI: https://doi.org/10.1007/s00436-023-08065-1