From Arizona and new to Michigan, zone 4. We know nothing about grass. We purchased a home with an existing lawn. I'm not sure what kind of grass it is. We have an irrigation system and started out watering for 15 minutes every other day in the morning in May, but since we haven't had much rain, started watering this month every day for 15 minutes in the morning. We've had the lawn professionally weed treated and fertilized on an interval basis. We have it mowed every 2 weeks to 3 -3.5 inches. The grass looks terrible and I'm not sure why. Is it grubs? Is it under or overwatering? Should we be deep watering less frequently and if so, for how long and how many days? Please help! Thank you.