@Valli My strategy is not to kill drones. More to the point, keep the numbers down. During swarm season this can be achieved by preempting swarm control measures. Using full sheets of foundation in the brood works for me. Small pockets of drones throughout the brood is fine, it's when you have large pockets of drones in the brood, that's where the potential for SHB damage lies. Only today I returned some stickies. After a couple of days, if there's a honey flow on, the bees will build comb in the gaps. I use all queen excluders. I notice some hives built the new comb with worker comb & other hives built the new comb with drone comb. Made me realise the hives building the new comb with worker comb must be happy with the amount of drone comb in the brood boxes. If you don't have SHB to worry about, my strategy wouldn't suit you.,,,,, PS if you did have your bees in a SHB area, you'd be well advised to avoid that "infestation" in the first place. It's every bit as messy, smelly & ugly as you see in the photos, only more so.