Air pollution and tobacco fleck studies in eastern United States

Journal Article · Mon Jan 01 04:00:00 EST 1962 · Phytopathology; (United States)

OSTI ID:5984236

Heggestad, H E; Silber, G; Grosso, J J

In tobacco-producing states along the eastern coast, most ozone-type air pollution injury has occurred in the Connecticut Valley on shade-grown, cigar wrapper tobacco. In 1960 and 1961, losses in this area were lower than usual because of change to fleck-resistant varieties. Ozone has been measured at Beltsville, Maryland, by an automatic ozone meter, by cracking rate in strips of stressed rubber exposed daily; and in 1961 by standard potassium iodide (KI) and phenophthalein methods. The day after high levels of ozone were indicated by the various methods, severe outbreaks of fleck occurred. In 1961, highest value day was August 28, when a maximum value of 9.5 parts/100 million (pphm) was indicated by the ozone meter at 12:25 PM. At 2 PM, when the ozone meter indicated 8.6 pphm, the values by the phenolphthalein and KI methods were 27.2 and 15.1 pphm, respectively. Differences are due to inherent characteristics of the methods: however, the methods maintained about the same ratios of values. Measurements in a chamber indicated the KI method was the most accurate for ozone. The ozone meter, however, provided the most useful data, because appearance and extent of plant injury could be related to both ozone concentration and the time that high ozone concentrations were maintained.

• OSTI ID: 5984236
• Journal Information: Phytopathology; (United States), Journal Name: Phytopathology; (United States) Vol. 52; ISSN PHYTA
• Country of Publication: United States
• Language: English

Related Subjects

500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
560303 -- Chemicals Metabolism & Toxicology-- Plants-- (-1987)
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
AIR POLLUTION MONITORING
BIOLOGICAL EFFECTS
COMPARATIVE EVALUATIONS
CORRELATIONS
INJURIES
MEASURING METHODS
MONITORING
NICOTIANA
OZONE
PLANTS