In the past few years, I'm noticing more ant nests in lawns in western
Massachusetts. Either I never noticed them before, or they're in an
infestation mode. They make circular nets from 1 to 2 feet in diameter. In
that circle all the grass will die. The nests rise only a little from the
soil level.

Are they a new pest? What species are they, and is there some way to control
them?

--
Joe Zorzin