Can anyone tell me if the brown spots on my lawn are fertilizer burn? I fertlized with Scott's Super Turf Builder (plus weed control, 29-3-3) on 4 June (8 days ago) and noticed these spots last night. There are about four of them scattered across the lawn. Within the dead spots, everything is dead, including the grass. The lawn is KBG, Tall fescue, Perennial Rye, and who knows what else.

It hasn't rained since I put it down, and I haven't watered it in. The weather has been warm, but only one day has been above 90 degrees.

I applied it at roughly recommended rate using my speedy green and I went 1/2 rate in one direction and 1/2 rate in the other. I have about 38,000 sq ft of lawn and I used 6.5 bags of Scotts (the ~7lb bags) which are said to cover 5000 sq feet, so that comes out a little less than the recommended rate.

Assuming it is fertilzer burn, what should I do? Will it get worse/spread? We're not supposed to get rain until Saturday here in mid-Michigan.

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