Randy Said: 6% of the used formula is nearly 6% w:w oxalic dihydrate!  Mighty hot!  Easy to kill a lot of bees that way...

> It is true. This concentration is hot. We use the medium column (concentration) in Randy's table to provide 3.2% oxalic acid.

The only trick to get good efficacy, we split the dose of 50 ml/hive. Half of the dose (25 ml) will be applied onto the bees in the bottom box and the other half is applied onto the bees in the top box. Simply apply 5 ml on each bee space bewteen frames occupied with bees. Thus, all bees are getting some of the oxalic acid to control mites. In our experiments when we applied all dose (50 ml) on bees in the top box we got about 60% varroa control. When we split the dose between top and bottom we got about 93% control. Of course, the later way of treatment is too much work to split the two brood chambers and apply the acid on each one.

Oxalic acid treatment only kills mites on bees.

Medhat
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