They will raise the same number of drones no matter what you do. They will fight to get 15% drone comb until they get it no matter what you do.
So, if I wanted to drone trap for varroa control I would have to wait until all starter strips were drawn out and then replace one frame near the brood nest with an empty frame (with or without starter strip) and they would fill it with drone cells unless they already had their 15 percent quota met. But if I used drone foundation they would fill it with drones? Or would even that be based on whether they had their quota of drones already? Thanks for your patience.
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You'll find 3 sizes of comb in every hive, worker brood, drone, and storage. Storage comb can run from smaller than worker brood cells to larger than drone cells. The bees build what they need, where they need it. If you find excess drone comb, or what you think is excess drone comb, just move it to the sides of the super and the bees will utilize it as storage comb. They do that away late in the fall as they start killing off the drones.
If you want worker comb place your frame in the direct center of the super--the the brood area that frame is almost always completely worker cell sized with some storage comb across the top 10 % of the comb. If you want to expand the worker cell comb just move the out frames in a box out and move the center away towards the sides one frame at a time. Once you have 8 frames of worker comb stop as the 2 outer frames, 1 & 10, are always storage.