> From my experience, that threshold is probably ok in late August here, but too high in early August, I am treating at 2% or higher in early August.

So, does that mean 2% as an average for the yard and treat the yard? Or 2% threshold per hive and just treat that hive? 

Because they way I look at it, if any hive in an apiary is over the threshold, the yard needs to be treated. 

On the other hand, when would it be safe to not treat? If you skip the treatment and you are wrong the consequences are far greater than if you go ahead and treat by the calendar. 

In my experience, at least half the hives in my yards are over 3% by August, and I treat all of them. I do sampling for record keeping, but the decision to treat in August is a done deal. 

This is using formic acid, which requires warm weather. I haven't used oxalic.

PLB

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