22/12/2025
Yesterday evening was winter solstice, and with this a new season begins. Quite symbolic, I finished the last washing and cleaning of equipment that same morning. What a nice feeling not to carry old dirt into the new year :-)
It's been quite a warm autumn, and the first part of the winter, and it has actually been too warm for the oxalic acid trickling. But as a perfect timing the temperature literally dropped 5 degrees over night, and we came below +5 degrees which is my threshold for the trickling.
So this morning I went out and did the trickling of the first half of the colonies. 200 colonies in one day is not bad.
One single colony was dead, without any obvious signs of a reason. The rest was from average to very fine in size.
Earlier this season I decide that now it is time for the next step on the ladder in relation to working with Varroa tolerance. This means that the 5 apiaries where the top half of the island mated queens, who where in for assessment and selection this summer are wintered, will not get the oxalic acid treatment. It might cost me a few colonies, but i consider this approach to tolerance as the only viable strategy in beekeeping where time is a constant issue. we simply don't have time for a lot of opening cells to check for fertile mites, which by the way will only be a smaller part of the tolerance.
We simply have to choose strategies we can handle on the long term. For me this is Hygienic behaviour test (freeze killed brood), reduced treatment (no winter treatment) and then a mite drop check in April in the second year of the queens.
The main stock will still be treated in the usual way, but the top notch queens will have to prove if they can handle the problem with a reduced treatment.
Time will show when it will be time for the next step up :-)