> On Oct 29, 2019, at 5:55 AM, Gene Ash <[log in to unmask]> wrote:
> 
> 1. Is there now a confirmation of the action by which oxalic acid acts as a miticide?

Recent work states
> The mode of action of OA against Varroa is unknown, but the direct contact between them is required (Aliano et al. 2006). An acaricidal action is attributed partly to a sensitivity of this species to acid pH (Maggi et al. 2016; Nanetti 2017). … Our results indicate that oxalic acid may be harmful to bee brood when present during application. … As a generic pesticide, there has not been the same level of risk assessment applied to oxalic acid use in colonies as other commercial pesticides.

source: Sabová, Lucia, et al. "Toxicity of oxalic acid and impact on some antioxidant enzymes on in vitro–reared honeybee larvae." Environmental Science and Pollution Research 26.19 (2019): 19763-19769.

Pete 🐝

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