5. TURF TIPS. A. PALE GREEN TURF. Joe Rimelspach noted that mysterious chlorotic patches of turfgrass have once again returned to lawns and fields in rain-soaked Ohio. Certain cultivars of Kentucky bluegrass develop yellowish, irregular patches and streaks during periods of continual rainfall, cloud cover, and warm temperatures. The cause is still unknown, however turfgrass scientists speculate that it is a physiological response to slow growth, high moisture, and temperatures unfavorable for turfgrass growth. Fertilizing or adding iron only exaggerates the condition as the healthy turf turns greener, in stark contrast to the sickly colored turf that is not growing. Fortunately, with proper mowing and maintenance, the turfgrass should eventually recover. A close examination of the yellowing turfgrass should quickly distinguish this condition from pale-looking weedy grass species.