Located in Western Washington
A couple guys in our group are reporting puzzling mite drops. We usually see hives in our area being bloodless around this time of year. They are treating with OAV and using sticky boards for mite count drop. They have done 3 rounds spaced about 5 or so days apart, and still 40 to 60 mites being dropped.
I have heard OAV is in the upper 90s effective this time of year.
What are we missing? Not bloodless, bad oxalic acid?
Highly doubt mite bombs with the weather we have had, wet, cold (Washington weather)
Looking for suggestions