Second round: started killing stumps in the prairie garden. I worked around the south edge and some in the middle, then moved partway up the north side. There is still a lot left to do in the north though.
Third round: New! Improved! Now with giant clouds of biting bugs! >_< I use Deep Woods Off with deet on my clothes, a milder chemical spray on my skin, and that discourages ticks and mosquitoes. It does not affect flies, so when those showed up today I added the herbal oil which discourages them. Total effect on biting gnats: zero. *snort, stomp feet* However, I did manage to finish killing the big patch of stumps on the north edge of the prairie garden. I think that is everything.
I really, really hope this stump killing stuff proves effective.