I renovated the yard with a slit seeder approx 4 weeks ago and have had germination and growth for around 24 days. TTTF and KBG mix from Site One. Used starter fert. These areas get a lot of sun as well. I've cut back watering a lot in the last week due to rain and in order to stimulate root growth. Been mowing to 2.5 inches every 4 to 5 days recently because it's growing fast. It's been unseasonably warm and rainy here in NJ lately. I've got the ability to spot or broadcast spray. I've got a bunch of these areas popping up. The grass is sticky and black/grey in these areas. Any ideas as to exactly what it is and how to deal with it? Are those areas toast?