If the turfgrass appears grayish just after mowing and turns brown a day or two later, your turf has probably been damaged by a dull mower. As shown in the picture, shredded by the dull mower blade. They later turn a straw-brown color that causes the general poor appearance. This damage is very common with rotary mowers. Always keep the blade(s) sharpened and the mower properly adjusted.
