I need help with my lawn. I live in NH and earlier this spring (May) my lawn was looking really good. There weren't any weeds, the color was a nice deep green and the stripes from mowing were well defined. Since then I've had two treatments of pre-emergent applied plus monthly fertilization and regular irrigation (5 days per week - yes I know this is a lot but my lawn faces south and bakes in the sun so this frequency in the past has given the best results). I try to mow the lawn twice per week with sharp blades. A few weeks ago I started noticing that the lawn looked like the tips were browning across the majority of the lawn. I know this typically points to dull mower blades however they are nice and sharp so that isn't the issue. I've been watering plenty and this past Friday applied Milorganite and the brown hue still is not going away. After closer inspection today, it looks like the brown tips may be Poa Annua or Annual Bluegrass. Is this the likely culprit? If so, what options do I have? I know it's a pain to get rid of it but it's really messing with the look/color of my lawn. Take a look at the photos. Thanks in advance for your help!