Certainly for the small beek. One $25 package will treat around half dozen or more hives. I have used them this year but probably waited too late to Texas Gulf Coast- late June. The SHB count is high right now. In my three hives.
I have noticed a much lower concentration in the a hive with window screen over the top screen board. All have top screen board but only the center one has window screening. One hive in three is not significant but interesting.