This today from ARS news feed.
https://content.govdelivery.com/accounts/USDAARS/bulletins/3612ebd
Of note; "Miticide treatment led to minor or undetectable mite and DWV infestations during the whole bee season, while untreated colonies had substantially higher mite and DWV infestations,"
While not the focus of the study it gives further confirmation of the benefit of keeping varroa and thus DWV in check for the entire season.
Paul
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