Super helpful information, thank you. I am going to take a look at all three hives this weekend and make an assessment. I live on a small farm, and there is another farm behind mine, together roughly 100 acres. There is some goldenrod, but not very much compared to other recent years. I didn't notice any appreciable Fall flow last year. I think I will likely err on the side of caution and treat for mites now with the goal of getting all three colonies thru winter and hope for a good Spring 2020 season.