InterestingUsing Oxalic acid with honey supers on, this is Dr Meghan Milbrath's interpretation of the US laws. What Does The New Ruling On Oxalic Acid In Honey Mean? – Bee Informed Partnership
You are only targeting the phoretic mites, a target of 15% of the hive, the rest, 85% are in the brood cells. If you don't trickle the supers then your target could drop down to 7.5% as a rough guess. Trickling is used mainly for new swarms or as a winter treatment. I wouldn’t use it with supers on, nor would I just target the brood chamber in the summer.Ok, but IF you would trickle at that time, you wouldn't do it over the supers, only the brood boxes?
Works well in some areas but not in others.Looking at Randy Oliver's material, he's doing a lot of work into OAE. Or extended OA by dissolving OA in glycerine on a 1:1 by weight basis and then soaking up the mix on sponges which go on top of the brood frames. He reckons area exposed is key. We'll worth a look at his progress, though not yet licenced, which he suggests could go on the hive in June. If it helps avoid some of the harder chemicals then I will watch with interest. Tim