I don't think this is all done brood. For instance, centre left of pic 5.
Perhaps there's another more re-assuring way to look at it and that is understanding that risks have consequences that are simply a part of bee husbandry. One of the reasons why honeybees are such a poor sentinel species is because beekeepers have agency over husbandry and therefore the health of the hives to a significant degree. Generally speaking when it comes to beekeeping, where there's a will it's all 'fixable'.
Yes, you're right. But it can be hard. A chap contacted me yesterday (for our association newsletter) to tell me he'd just lost his colonies to EFB. He'd moved them into a red zone, but only discovered that after the move, when he updated his BeeBase record. He keeps bees with his son, and not surprisingly he's worried his son will give up. Words like 'We'll be stronger with this experience behind us' can only do so much to generate the will to carry on.
