Varroa.. In summer I placed checkmite strips and I was suspecting that varroa is developing resistance to it. Even so, due to hard pressed with other obligations and work all day, I really wasn't able or willing to additionally use some other anti varroa treatments. Well, later on when I finished most of other work, I already saw some dwindled due to varroa. I eliminated them. Also I struck the varroa but will see in spring was it enough. I treated them with OA and after 7 days one of which I counted - around 130 varroa fallen..
Also others used bayvarol, which is also not efficient here any more..
I need some strips to be free in August for it cause have a lot other work I must run to finish ( hazels).. One year I made OA/gly strips and they were better than checkmite this year, I am thinking to make them for next season again.. will see..
Also when I am extracting, I shake bees in a bin from supers and shake back in hive. I plan to every time I return them after extraction to spray them with OA or beevital, or varomed, or something simmilar.. I won't kill all varroa, but will cut the rising curve of varroa population.. and these substances are natural compound of honey and won't later affect the honey..