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Science 23 January 1959:
Vol. 129. no. 3343, pp. 208 - 210
DOI: 10.1126/science.129.3343.208
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Articles

Ozone in High Concentrations as Cause of Tobacco Leaf Injury

HOWARD E. HEGGESTAD 1 and JOHN T. MIDDLETON 2

1 Crops Research Division, U.S. Department of Agriculture, Plant Industry Station, Beltsville, Maryland
2 Department of Plant Pathology, University of California, Riverside

Evidence obtained by means of rubber strip tests and an ozone recorder indicates the presence of abnormal concentrations of ozone in the atmosphere at times. Excellent correlation was obtained between appearance of "weather fleck" in tobacco and high values for ozone. The great similarity between lesions occurring naturally and those produced by ozone in chambers also indicates that ozone is the probable inciting agent of weather fleck. Varietal differences exist. Study of stomatal action helped to explain variation in leaf injury.


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Antiozonants To Protect Plants from Ozone Damage.
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