Our lawn is bumpy with small bumps of dirt visible at times, why ?

Tina Rempel
by Tina Rempel
The lawn looks healthy although a bit on the dry side in areas. We live on an acreage so watering it isn't an option. Nature does that. A friend told us it was mealy worms, I don't have a clue. How do we get rid of it? Can't post a picture as we still have snow.
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