Does anyone think that OA vapor treatment should not be done this late in the northeast? I was still seeing adult varroa drops on my BB's in a couple of hives after an early Sept. formic acid treatment and a couple of summer OA vapor treatments. I figure it would be good to beat back the mites now while there is no brood, but is there any reason not to treat with OA at this time of year? Girls were still bringing in pollen prior to Sandy, but not much opportunity for flights since.