http://cru.cahe.wsu.edu/cepublications/eb0856/eb0856.html I remember at my first house when I was married in south Everett, Wa, we got an infestation of these critters. They destroyed the lawn. It completely disappeared. Looking across the yard of dirt, you could see the whole ground moving from these larvae. Disgusting! We had some big, burly, masculine guys doing some kind of work there and when they saw this, they leaped up into the air, flailing their arms and squeemishly saying in high pitched voices, "Eeeewwwwwwwwww!" I had forgotten all about these icky insects because they don't have them in north Idaho because of the cold winters. Now, being back in Washington, I see these crane flies doing their thing, flying at a low altitude, close to the new sod. Grrrrr. So, now I have to do a test to find out how many there are per sq. ft because if there are not too many, it won't damage the grass and in fact, actually can aerate the soil. But too many can totally wreck the lawn. I think I'm too late in the season to do anything about it. Have you ever seen these things or have you ever had to treat for them? Lawn is like one of my favorite crops. LOL. I hate to have it wrecked.