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this year ...due to all the damp weather. There was a big article on them a couple of weeks ago ..Apparently the damage has yet to be seen as these ugly things are laying eggs in the grass. Once they hatch and become young grubs, they chew on the roots and can be seen on the actual blades of grass. At the moment, there is really no effective treatment. All we can do is hope for at least an extreme cold snap in the winter, altho they say, some will survive and then we will see the real damage in spring.
Here is a Canadian Gov't link
http://www.atl.ec.gc.ca/epb/factsheets/bkyard_bug/crane_fly.html
I get them in the damp areas of my lawn only. They do not seem to bother the lawn areas that are dry. I don't spend the money to spray as I have kids, and the crane flies will just fly over from the neighbours and lay eggs anyways. They're not around for long, so I don't worry about it - sounds like yours are quite bad.
I did a search on the Net and they look someone like the fish flies that Lake Winnipeg gets every so often. Try a search and it tells you how to control them, I think it involves a professional. Some called them marsh flies.