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Subject:
Re: Is Oxalic Acid Vaporization Harmless?
From:
Peter Borst <[log in to unmask]>
Reply To:
Informed Discussion of Beekeeping Issues and Bee Biology <[log in to unmask]>
Date:
Tue, 29 Oct 2019 15:33:22 -0400
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> While oxalic acid at EPA-recommended treatment levels of 5 ml at 3–5% of OA in sugar water has been found to be safe for adult bees, this study shows that oxalic acid is very toxic to honey bee larvae. The current study provides a reasonable model of larval exposure to OA in treated beehives. Beekeepers should be aware that using OA for mite control while larvae are present could have a negative downstream effect on the colony population size and wintering capability.

source: Terpin, Bethany, et al. "A scientific note on the effect of oxalic acid on honey bee larvae." Apidologie 50.3 (2019): 363-368.

Pete 🐝

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