>Ive read a lot about small cell size being helpful in reducing mites, but I know next to nothing about it. If I place foundation with small cells in the hive would bees right out of a package draw on it? Or do I need to regress them?
If you're lucky the package you got came off of Mann lake PF100s which are already 4.95mm but people using them don't usually know it. Or they came off of Pierco frames or foundation which (depending on the depth and the style) is about 5.25mm. If so they will draw 4.9mm right out of the package. If not, you may have to regress them. I've had no troubles with the Mann Lake PF100 and PF120s (other Mann Lake products are 5.4mm) and package bees have been drawing it perfectly right out of the box.
Also PermaComb is 5.0mm equivalent and Honey Super Cell is 4.9mm equivalent and it's already drawn so there is no problem getting them to draw it. Just put a package on nothing but that and they will have no choice but to use it and once they use it it's well accepted.
So the answer is, maybe. If you put them on just wax and if they came from smaller cells (Pierco or Mann Lake PF100 or PF120s) then they will probably draw it fine. If you put them on PF 100 or PF120s they will probably draw it fine. If you put them on PermaComb or Honey Super Cell they don't HAVE to draw it. So in all those cases you may be able to skip regression and they may go right to 4.9mm (or at least 5.0mm in the case of the PermaComb).