Talk:Crane fly

I live in Ontario Canada and have advised by our lawn service that they expect an epidemic of crane flies on our lawn. They state that they will eat the roots of lawn causing damage and they want to spry for same. I would like to know if this is the case or if they are just trying to make money on this. We have sprayed for grubs two weeks ago which seem to do the same damage. If they law larvae, do the racoons dig in the lawn for them? A little advise would be appreciated. Thank you, Kathy