VIEW ARTICLE

Ozone Injury to Plants as Influenced by Air Velocity During Exposure. Allen S. Heagle, Plant Pathologist, Air Pollution Control Office, Environmental Protection Agency, Raleigh, North Carolina 27607; Walter W. Heck(2), and Denis Body(3). (2)(3)Plant Physiologist, and Engineer, respectively, Air Pollution Control Office, Environmental Protection Agency, Raleigh, North Carolina 27607. Phytopathology 61:1209-1212. Accepted for publication 14 May 1971. DOI: 10.1094/Phyto-61-1209.

Oat, tobacco, bean, and cucumber seedlings were exposed to ozone in paired fumigations to determine whether varying air velocities near the levels used in experimental exposures affects the amount of subsequent ozone injury. The velocities of 0.26 vs. 0.82 km/hr (0.16 mph vs. 0.51 mph) and 0.26 vs. 1.1 km/hr (0.16 mph vs. 0.71 mph) were compared during 1- and 3-hr exposures. Air velocities during exposure had little or no effect on ozone injury to oat and cucumber. Tobacco was often injured more at the high air velocity, but the differences were usually not significant. Bean was more severely injured at the high than at the low velocity, and the results were often significant. The effects of air velocity on the severity of plant injury were greatly influenced by plant species.