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Air Pollution Oxidant Effects on Cool-Season and Warm-Season Turfgrasses¹

Although turfgrasses are grown extensively in urban areas where air pollution is a problem, little is known about their reaction to air pollutant oxidants. Cultivars of common turfgrass species were started in a greenhouse with charcoal-filtered air. One lot of each was fumigated with 0.50 ppm ozone and another with 0.50 ppb peroxyacetyl nitrate (PAN) for 3 hours. A third lot was retained in the greenhouse as a control. Significant variations in leaf injury were noted among the species and cultivars. Injuries to a cultivar from ozone and PAN were often of different magnitudes. All Lulium perenne L. cultivars showed severe injury while Poa pratensis L. cultivars ranged in sensitivity between the extremes for both pollutants. Agrostis tenuis Sihth. and Festuca rubra L. cultivars had moderate injury. Warm-season grasses, in general, were less sensitive than the cool-season; only ‘Emerald’ Zoysiagrass and ‘Tifgreen’ bermudagrass showed injury.

Key Words: Photochemical air pollutants • Ozone • PAN • Peroxyacetyl nitrate • Leaf injury

² Professor of agronomy and staff research associate, respectively.

Received for publication April 5, 1979.