I expect those swarms are varroa driven, be aware if they move into one of your hives, mite bombs.
Purple looestrief now being ignored by bees here, mostly done. Joe Pye and Goldenrod going strong. Not seeing asters yet.
Will start my 3rd round of OAV Wednesday.... I treat all hives in August regardless of mite counts. I find it works well and there is no reason for me to change. My mite counts a couple weeks ago were pretty good. Quit those Carni queens a couple of years ago. Get much better production from my Italians and winter survival is about the same for me.