Normally, I give each colony a dose of powdered sugar and terramycin in the fall. Unfortunately, that didn't happen last October.
Should I treat each colony now?
If so, how long should it be applied before the honey supers go on?
It is wise to look, if your hive's brood area is compact. If you do not see holes, no collapsed or dry larvas, or caps with brown holes, there is no use to give medicin.
If you have healthy brood area, don't give old frames were is old capped brood or sign of deaseases:brown extra paint in the cell.