Hello, this has probably been asked and answered before but my lawn is taken over in July by this light green very thick diseased grass almost like a carpet, it is very hard to mow and scalps very easily. It goes away in like march and starts to come back in June-July and by the time it's fall all my yard is taken over by this stuff. It gets worse every year. It's a thick, ugly light green carpet type stuff that's ugly. If I can figure out to post a picture on here I'll take a picture of the grass and put it on here. Any help would be appreciated.