Effects of air pollution on tobacco cultivars grown in several states
Weather fleck, a tobacco (Nicotiana tabacum L.) leaf spot, is an important production problem in Connecticut and Florida, and also in southern Ontario, Canada. It occurs sporadically in other tobacco-producing areas of the United States. Evidence indicates that the photochemical air-pollutant ozone causes the flecking of Connecticut and Florida cigar wrapper leaves, and of flue-cured leaves in Ontario. But little information exists concerning the nature and causes of similar leaf injury on tobacco in such states as Kentucky, Maryland, North Carolina, Ohio, Pennsylvania, and Tennessee. Field studies at Beltsville, Maryland and Windsor, Connecticut have identified ozone as the cause of weather fleck in experimental tobacco plantings at these locations near commercial production areas, but no systematic study of weather fleck has been made over a large geographical area of several states. During the summer of 1968, a cooperative investigation of the weather fleck response of 16 tobacco cultivars grown in 7 tobacco-producing states was conducted. This paper describes, illustrates, and discusses the results of this field experiments.
- Research Organization:
- Dept. of Agriculture, Beltsville, MD
- OSTI ID:
- 6050108
- Journal Information:
- Tob. Sci.; (United States), Journal Name: Tob. Sci.; (United States) Vol. 169:3; ISSN TOSCA
- Country of Publication:
- United States
- Language:
- English
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