I think I have seen this several times. A customer mowed his lawn last Saturday when it was a little wet. This week large parts of his lawn have a brownish tinge. Upon close inspection, I found many cut leaf blades appeared to have a white tip. It was as if a fungus had invaded the cut tip of the leaf blade and moved down the leaf blade about an inch or two--turning it white. Almost as if dollarspot had infected the cut area and the infection worked its way down the leaf blade. Weather is too cool for ordinary dollarspot (I think), about 50 at night and 65 during the day. Bluegrass and rye. Has anybody else seen this? Is the white tip caused by mowing when it is wet? Is it dollarspot? Some other fungus?