Sometimes, like during summer, the colony produces multiple queens that you don't need. If you do let these larvae live, you run the risk of your entire hive leaving in a swarm. You might as well collect the royal jelly (which by the way is the most nutritious natural substance-containing over 43 different minerals and vitamins), before you kill them. What I don't agree with is that if your queen cell is capped - it is too late to get the royal jelly as your hive will have swarmed along with your old queen. Now you need to leave all the queen cells, as you will need a new queen for the bees that stay behind and don't swarm. When I collect royal jelly I do it when the larvae are 3 days old.

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