I'm a first year bee keeper. Keeping detailed daily records about what is happening. Pollen color changes thru the season. It is now mid October and there is still a lot of pollen coming in. Sort of a city yellow with some white. I've asked other bee keepers what they think it is and I get two answers-don't know or asters. I believe asters are the largest genus of plants? but what asters would be in bloom now? We haven't had a frost yet. Thanks
Montgomery County Maryland
There are many types of fall blooming asters. White wood aster(Eurybia divaricata) is one example. The following is an article on fall blooming asters, http://garden.org/learn/articles/view/283/
Goldenrod is in full bloom now which may account for the yellow pollen. Boneset and groundsel bush also attracts bees. They have white flowers and bloom in the fall.
good luck with your beekeeping!