The adverse effects of synthetic acaricide tau-fluvalinate (tech.) on winter adult honey bees
Currently several pyrethroids (e.g., flumethrin and tau-fluvalinate) are used in apiculture worldwide as acaricides/miticides. The long half-lives of pyrethroids in synthetic acaricides applied to hive matrices, may adversely affect the health of bee colony. The potentially adverse effects of synthe...
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Veröffentlicht in: | Environmental toxicology and pharmacology 2022-05, Vol.92, p.103861-103861, Article 103861 |
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Sprache: | eng |
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Zusammenfassung: | Currently several pyrethroids (e.g., flumethrin and tau-fluvalinate) are used in apiculture worldwide as acaricides/miticides. The long half-lives of pyrethroids in synthetic acaricides applied to hive matrices, may adversely affect the health of bee colony. The potentially adverse effects of synthetic acaricide/miticide tau-fluvalinate (tech.) on winter honeybees were assessed in this study (OECD 245 2017). No dose-dependent mortality in in vitro reared winter honeybees was observed after chronic oral 10-day exposure to syrup (50% w/v) spiked with a maximum concentration of 750 μg a.i./kg diet and its 1/10 concentration. The No Observed Effect Concentration is ≥ 750 μg a.i./kg diet. Tau-fluvalinate testing for the sublethal effects on bee immune system showed up-regulated gene expression encoding abaecin, lysozyme, and defensin in both tested groups, however the expression of hymenoptaecin gene was reduced. Moreover, tau-fluvalinate significantly induced levels of DNA damage in exposed bees, which can result in adverse genotoxic effect.
•The No Observed Effect Concentration appears to be ≥ 750 μg fluvalinate/kg diet.•the sublethal changes of selected immune-related gene expression were observed.•induced significant levels of DNA damage was observed after chronic exposure. |
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ISSN: | 1382-6689 1872-7077 |
DOI: | 10.1016/j.etap.2022.103861 |