The usage of filter paper in beehive :Varroa treatment

For example:Each frame bee uses 1 ml of 85% Formic Acid,or the name Methane Acid,Methanoic Acid,drip it onto the filter paper in advance.Then place the filter paper on the frame beam of the bee colony and place two wooden strips horizontally on top of it,finally cover the bee cover.Waiting the medicine to slowly evaporate,can effectively kill varroa on the bee body and inside the nest.During treatment,carboard should be inserted at the bottom of the beehive to collect fallen varroa.During treatment,different drugs should be used alternately to prevent varroa from developing resistance due to long-term use of a single drug.