Tbh, I dont really believe in the concept of F2 aggression. People talk about it a bit, some people passionately believe in it, I dont.
To me it's just a question of breeding not generations, and beekeeper experience.
Or put it this way...you buy a nuc with an f1 buckfast queen from a main supplier. .. its really nice the bees are lovely and calm.... Why? Because the breeder has selectively bread the queen for those traits. Some of the queens that were produced may well have been angry queens even if Intrumental Inceminated to control the gene pool. But your queen isnt angry why? Because it's not in the interest of the supplier to sell you the angry one. If they did you wouldnt by another one from them. So they selectively breed and dispense of the problematic ones.
Now think, after a year or two or 3, your queen leaves, fails etc and is replaced. The new VQ goes out and mates with drones in the area of questionable genetics because none around you is selectively breeding. So you have a good VQ that mates with the local bad boys. So you end up with less well behaved bees, your experience now means you see a marked difference between the f1 buckfast and the f2.
But take that same f1 and instumentally inseminated with good boys, or open mate and select the best queen and cull the rest then you get bees as nice as the originals.
One of my out apiaries is problematic for me for open mating queens, every open mated queen from there has had varying levels of aggression. It's about 5 miles from my home apiary where it's very rare for me to get an angry queen. Why? Because almost every beek within a mile or so of my hone apiary has queens from me. So it's my genetics and selection that has improved the mating area around me. But the other out apiary I havent distributed my queens to the surrounding beeks as I'm not sure where they are. So I just dont allow queens to mate from that location.
Now to the question of why they are stinging.
Just as with everything that doesnt go quite right in beekeeping, you should analyse why you are being stung, so that you can make adjustments to correct the situation.
It may be that it's dodgy Gene's. If so then replace her, dont stick with it because her offspring will then mate with other peoples VQs or drones later down the line and vice versa and the problem spirals.
It may just be that the bees are hungry, they get grumpy as we do if they are hungry.
They may be taking offence to the scented laundry powder you washed your clothes with, or the shampoo you washed your hair with or the Lynx Africa that you liberally applied as it was a hot sweaty day.
They may be queenless.
You may have alarm pheremone on you.
Etc.
So analyse it, work out why and then address it.
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