From the video: Practical Beekeeping Part 5
▶ Play the video — transcript will follow automatically
The next video is at the bottom of the page — scroll down to continue ↓

Herbal contact preparation for varroa control — up to 98% effectiveness, no residues in honey. From just 1 EUR per hive.
The Farrar hive is wintered with four shallow supers, and the Langstroth with two deep supers. In early spring, colonies develop on these supers, all the way until preparations for the main honey flow.
Production colonies are set up approximately 15 to 20 days before the main honey flow. On the slopes of Konjuh, the main honey flow begins June 5th to 10th, which means this operation is done around May 20th. The date of setup is recorded in the logbook and marked as day zero, so that subsequent operations can be tracked.
Around May 1st, during the fruit tree nectar flow, one drone comb frame is placed in each hive for catching varroa biologically. When setting up the production colony, the drone comb with drone brood is removed and discarded.
The queen is located, and the frames are sorted into three groups:
In this way, the queen gets plenty of space for laying and the swarming impulse does not develop.
A solid divider is placed to physically separate the queen in the brood box from the honey super. Behind the divider go about eight frames of sealed brood and two frames with honey and pollen. With this, the production colony is organized and ready for the main honey flow.