I.Trial is required. Choose 2 or 3 colonies for trial before applying to the whole yard. Observe for 48 hours, then making a plan for the situation.
II.Dosage: One piece for 4-comb hive, hang in the main bee path, keep it off the hives. Two pieces for 5-8 comb hive, hang one piece between the third and the fourth comb, the other piece between the sixth and the seventh in a diagonal line. More or less for 10 combs.
III.Medicine-applying time: Any time in a year. The best time is before spring reproduction and after autumn honey harvest. The effect is most obvious in no-larvae period. If in the larvae exiting period, prolong the time to 6-8 weeks for most of the female varroas are the honeycomb.
IV.Determine the medicine applying time according to the yard situation.