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Informed Discussion of Beekeeping Issues and Bee Biology

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Informed Discussion of Beekeeping Issues and Bee Biology <[log in to unmask]>
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Wed, 30 Oct 2019 07:19:45 -0400
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Informed Discussion of Beekeeping Issues and Bee Biology <[log in to unmask]>
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Cam Bishop <[log in to unmask]>
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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.

This is all direct treatment of OA solution. My experience is that OA vapor is not a problem for larvae of adult bees.

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