In your area with the summer dearth it sounds like the forced brood break could be a plus. Not so in our short season with a gradual flow and no fall flow.during our summer dearth here in northeast alabama we can see a dearth induced brood break lasting for a couple of months. the reduction in population is helpful in terms of not so many mouths to feed and conservation of stores.
my take is that the dearth conditions force the brood break so the beekeeper doesn't have to. i think this weather pattern tends to drive local selection toward favoring a strain that down modulates brood rearing during times of dearth, and one of the side benefits of this is putting a dent in mite breeding as well. should decreased mite breeding be combined with the trait of grooming and mauling it could be that the colonies are able to reduce the mite infestation during the dearth and prior to the late season brooding up of the wintering bees. i hope to have enough time some day to undertake some careful observations to rule in or out such a paradigm.In your area with the summer dearth it sounds like the forced brood break could be a plus.
This is what I see here during the July/August dearth. I don't know the exact conditions that trigger the restart of egg laying, but I am guessing some sort of combination of day length and a rain event. Or the amount of stores or.......my take is that the dearth conditions force the brood break so the beekeeper doesn't have to.
The part of that study that really stood out to me was the table of survival rates within each group. They used 10 colonies per group. Positive control got apivar. Negative control got nothing, just left alone. Oxalic acid two ways, first a single treatment, second 3 treatments at week spacing. Then brood interruption, and then brood interruption combined with each form of oxalic acid treatment. The numbers were not insignificant and all the combinations and permutations were run. Survival resultsIn the equipment forum,we were having a similar discussion on brood interruption and grozzie brought up this study.
Treatment Survival ===================== Neg Control: 0.7 OA-1: 0.5 OA-3: 0.7 BI: 0.1 BI-OA-1: 0.4 BI-OA-3: 0.6 Amitraz: 0.999 * * To calculate odds rations, survival cannot equal 1. Thus, 100% survival is presented as 0.999.
that's not what the science shows as Dr Büchler notes the Italians have done a LOT of work on it. many many studys, and they show a dramatic effect, far more impact then even a few brood on OAVsA brood break itself is not what makes the Varroa population decline (they can survive longer than 2 months as phoretic mites), it usually the treatment following it to kill the mites that are then mostly phoretic.
Looks like we have similar situations. I stopped buying foundation a couple of years ago, but it isn't too hard to cut out drone comb. I may give that a try this year. Yes, finding all the queens is an issue. I'm sure the chickens would love drone comb. Although, I have wondered what it does to them to be eating wax. I have one smartie that tried to follow us around so she could get the bees falling off the lids. She loved it when hubby put a lid down, bees facing toward her. Had to reposition that quickly. What do you use for mite control?My bees fly year round also. My opinion is that it is would be ****ed hard to find all the queens to cage.
Easier would be to have a drone comb at the edge of the brood box which could be periodically removed and destroyed (fed to the chickens?) This would work really well if you, unlike myself, used plastic foundation so the bees can't raise drones everywhere. To get the drones just insert a frame with no foundation at side of the brood nest--position 2 out of 10 frames.
Guaranteed that they will build drone comb in that frame. I know MB, if he's around, will object.
But how many bees are dying each day? The brood break obviously ceases reproduction of not only the mite but also the bee. Have you reduced the mite-to-bee ratio?"A brood break itself is not what makes the Varroa population decline (they can survive longer than 2 months as phoretic mites), it usually the treatment following it to kill the mites that are then mostly phoretic."
In his presentations, Büchler clearly states that during the brood interruption 1% to 2% of the mites die per day which is around 40% to 50% of the total mites before a comb trapping or oxalic treatment.
You can't ignore that.