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Subject:
Re: Oxalic Acid: Effects on Brood?
From:
Pete B <[log in to unmask]>
Reply To:
Informed Discussion of Beekeeping Issues and Bee Biology <[log in to unmask]>
Date:
Fri, 13 Mar 2020 18:03:06 -0400
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> It is recommended that OA be applied in the fall or winter when larvae levels are low, but many beekeepers are so desperate to reduce mite burden that they are using it at other times of the year (personal communications). 

> 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.

A scientific note on the effect of oxalic acid on honey bee larvae
Apidologie (2019) 50:363–368

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