OK, Lazy, you may have me there!
I was referring to Randy Oliver's writing on spring/summer applications of OA.
"Spring/summer application(s)* This is much less effective, since oxalic does not kill mites in the brood. There is some controversy as to summertime application (see Does it Harm the Bees?). You’re on your own here, but the bees seem to handle one shot well (even at high doses); multiple applications are more questionable. "
Referring to Fall/Winter applications, Randy writes, "Winter broodless application Oxalic acid is well researched for a Fall/Winter broodless application, or can be used in colonies made broodless by manipulation—such as (1) to treat package bees, or (2) to make “clean” nucs. Accurately measure 3-5ml of 3.5% w:w solution per seam of bees, and treat one time only, or you can harm your colonies."
Jennifer Berry, Bee Culture Magazine, September 2018,
Go With What We Know! doesn't recommend the spray or mist method for the Average Joe beekeeper. It's trickier to apply and much harder on the bees.
I will say, over the last several years, I have read members posting on the forum that they do frequent applications. I do mean frequent. If they should read this, they will who they are. Oliver cautions against frequent treatments. I drew my own conclusions.
