I spot sprayed 2 days after a rain event and there was a brief rain several days after spraying. Air temperature did not exceed 90 degrees for 3 days after spraying. It is now the 5th day after spraying and my centipede grass is severely damaged. It is difficult to assess the effectiveness to the product on the target species (yellow nutsedge) due to the damage to the centipede. I sprayed some purple nutsedge, also. At present the purple nutsedge is still green and alive.