I've got a customer who's lawn was in really tough shape this spring, I put down a pre-emergent in the spring, then I did not spray Momentum in the spring because the lawn still looked pretty bad (NOTHING was growing, not even weeds). He finally got his irrigation system up and running and we've scheduled it to water the crap out of the grass, put down 18-0-18 w/ 4% Fe and its started to green up real nice, but then of course the broadleafs started to grow too. Hit it with a blanket app of Momentum Fx, and he's got one area of the lawn that died or went dormant. Its patchy, not consistent with my spray pattern etc...what could this be?? Did I do this? BTW, I also do his neighbors lawn, same program, it looks like a golf course!