So I one hive that is on its 3rd year, it overwintered each year and I just put on my honey super. My 2nd hive I installed a few weeks back and just added the 2nd deep. In the past I would get an idea of my mine count using my correx board and Vaseline but treat in the spring and fall regardless. I usually use Formic Pro above the 1st deep.
If I do a mite count and its fairly low, should I always treat or am I sometimes better off just monitoring the mite level and treating if it needs it?