Yes, unfortunately I have. Varroa Destructor is the bane of keeping bees these days. Fortunately I am in a rural, non-agricultural area, and there is plenty of pesticide-free bee pasture and I've been spreading sweet clover seed in the utility right-of-ways for years.
The mites got ahead of me last summer and I lost a half-dozen huge hives this winter (a mild winter that should have had zero casualties). I lost none 2014-15 and that was a tough winter. My bad for thinking I was on top of handling the mites. I was just 2-3 weeks late with a formic acid treatment last summer. I try to treat for mites without miticides as those leave residues in the wax. Some of the natural treatments include: Hops Beta Acid, Formic Acid and Oxalic Acid. The varroa infestation weakened the bees raised as fall "winter bees" and the fate of those hives was sealed in August.
@Prawn, I've never considered that. Honey is an anti-bacterial, anti-fungal brew. The pH is acidic as well. I have no idea what happens to cannaboids in that environment. Tho I have a pretty good idea about how to test that
I have lots of "green dragon" on hand and would need to evaporate the ethanol out of a test quantity first. Then there is the issue of how long is a reasonable test of cannaboids surviving the honey environment.
3 months? 6 months? Longer? Still, experiments can be fun. So, easy answer is make 12 test batches and test one a month
