Deb Curtis writes:
Does it make a difference whether to check the hives in the evening, when bees are back but it has cooled off and bees are in the hive or during the day when bees are out forgaging and coming back and forth?
Well of course it matters. Working your bees when the nasty old field bees are preoccupied in their foraging, will result in a much more pleasant experience for you, and less intrusive for your bees. In fact, not only will the bees be less aggressive, your work will be easier. The hive won't be clogged with field bees, making it easier to inspect the brood, look for swarm preparations, and easier to find the queen on those occasions when you must.