Hello all, got a situation with which I'm not sure how to handle. Mowed customers lawn a week ago got these pix in email today... she says started looking like this a day after I was there. Front yard is looking good but backyard has this striping. Any clues as to what is happening. Trugreen was there about 3 weeks ago but I don't think that matters. Mowed with Walker GHS, 42" mulching deck about 3 1/2". Almost looks like needs more water but wanted to eliminate me and the mower as the problem first.