We use oxalic acid as a preventive treatment against the varroa mite with a dose of 25-30ml per hive (from a mixture of 75g oxalic acid powder diluted in 1 litre water + 1kg sugar)
We treated the four hives in Espoo yesterday and the hives in Pojo on Friday. It was opportunity to take a peek inside the hives.
In Espoo three of the four hives are active (but no brood yet) and have cleaned out after the winter. The fourth hive (the so-called nasty buggers) is still in a small ball and not active. It is very small and we think it unlikely that it will survive. We need to take a closer look to figure out what the problem is but it is too cold at the moment (we are having frosts at night).
In Pojo one of the Rosendal hives is empty. This is the hive that we moved from Espoo and installed on the foundations of the old barn. There were no signs of intrusion, mould or anything else. This was a split hive and possibly too small to survive the winter. All the other hives are in great shape.