After 2 yrs. of checkmite I would like to rotate treatment to apistan. Checkmite has given excellant results, but I believe switching treatment will prolong its effectiveness. Will apistan be effective ? If the mites were tolerant to apistan after 2 yrs. with checkmite those mites would have been targeted and their offspring more suseptable due to lack of exsposure. Does anybody have any experiance with this practice . I treat once a year in early fall.