(that was post #44 of this thread)Yes, All I have on this is guess work from observations as well. Hopefully it will lead us both and everyone to further insights and more successful beekeeping management.
Yes, it may be good in the spring, but when the hive starts backfilling the drone cells and drones die off or leave or get booted, it sure does cause a large heavy hit on the worker brood. Treatments or splits or splits with treatments in timing with this can be very beneficial to controlling mite numbers in summer, I'm betting. In my area I'm noticing this starting around middle of June, perhaps due to solstice and lack of enough good forage.
My wife gets headache just when strong low pressure is coming above Stockholm (in Sweden), some 400km from here.I'll may start ingesting more honey, but my migraines are typically triggered with pressure changes. I'm typically fine all year until fall usually when the winds or storms come and then it'll clear after some time and once spring hits I rarely worry about them anymore.
A long term mite increase (decrease) can be measured from the results of several mites counts, how many % a month/year.I am wondering if counting mites is only useful for researchers, and not so much for people trying to produce mite-resistant colonies. If a colony has a high mite count on one inspection, but still survives, did it really need treatment? Maybe a zero mite count isn't what we should be looking for, but colonies that deal with the mites and survive anyway.
From my area and experience, no. Mites actually do very well in booming, well fed colonies because the increased brooding drives exponential mite reproduction.Jut re-read the thread, and it seems to me a couple of things pop out.
First, that food resources seem to have a large effect. The colonies that had good feed also resisted mites better. Not surprising if true. Do you see that?
This points up one of the main issues with the many programs aimed at finding Varroa resistance...they do not yield meaningful resistance.I have yet to see any hives capable of withstanding even moderate levels of mites here. What I do see if as the genetics have shifted towards more VSH, these hive simply crash later in the year than the really susceptible hives.