[Pollinator] Canadian Oxalic acid Registration

[Laurie Adams]

On Sat, Mar 13, 2021 at 5:30 AM John Purdy <johnrpurdy at gmail.com> wrote:

> Pollinator list:
> The USDA move to allow use of oxalic acid year-round contrasts with the
> Canadian oxalic acid registration, which is owned by the Canadian Honey
> Council. Actual research data to support this would be helpful.  The
> Canadian label contains a caution that oxalic acid kills brood under the
> conditions of use for Varroa mite control and should only be used when
> brood is not present, such as before or immediately or after overwintering.
> As the small amount of brood that is present in spring is very critical to
> survival I would only use it in the fall to ensure no mites carry through
> the winter. Also the Canadian label states that the treatment does not kill
> mites in capped brood. This would compromise oxalic acid treatment
> effectiveness when brood is present. Having a time each year when there is
> no brood in the hive for mites to reproduce and hide in is a good way to
> enhance mite control.  See https://pr-rp.hc-sc.gc.ca/ls-re/index-eng.php and
> search for oxalic acid
>
> John Purdy
>


Laurie Davies Adams
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