We are seeing, in the last couple of years, beekeepers that are experiencing fall absconding and winter die offs due to Varroa mites. Some are waiting until Nov.-Dec. to do oxalic acid treatments. That appears to be too late. My goal is to do repeated powdered sugar rolls throughout the flying season. That way I will know when the mite levels have reached the threshold of 3 mites per 300 bees. Some suggest that the threshold is 5 mites per 300 bees. When the threshold is reached it will be time to coordinate the proper treatment with air temperature, etc.
Research is showing that the bees that emerge in Sept. are 2 generations from your winter bees. (NE Kansas time frame) In order for your bees to be healthy going into winter, you need to knock the mite counts prior to Sept.
I always try to pull supers as soon as the nectar flow is over so that I can start mite treatments. My mite counts are always high then, especially on the colonies that brought in the most honey.
Grandma Bear, are talking about feeding stations for sugar syrup, pollen sub, or both?