Now is the time beekeepers with overwintered colonies should check for mites. There has been brood in the colonies since February and the mite numbers can be increasing. Checking for mites can give the beekeeper the ability to assess whether to treat the colonies or not.
If you don't check for mites, and it turns out they are currently high numbers of mites right now in a colony, the colony can possibly perish by early July.
It is easy to check for mites. The more times you do it, the easier it gets.
Package bees should be checked for mites starting June 1st.
Mite checks should be performed once a month until October 1st.
Mite test kits can be purchased at Nature's Nectar LLC.