Abstract
Tobacco weather fleck has caused significant losses of flue-cured tobacco in southern Ontario since 1955. Fleck damage was greatest near the coast of Lake Erie and decreased progressively inland. Ozone has been shown to be one of the most important incitants of the fleck response in tobacco whereas parasitic fungi, bacteria and viruses were proven not to be implicated as causes of the disorder. The inherently susceptible variety White Gold, used in all tests, was rendered more susceptible by irrigation and nitrogen deficiency. It was also more susceptible during flowering and when producing lateral shoots. The degree and duration of stomatal opening were important factors in determining the amount of injury. Concentration of ozone in the air was shown experimentally to affect the speed of fleck response as well as the severity of symptoms. Statistically significant correlations between ozone concentrations and fleck damage were obtained from field data when the response of highly susceptible tissues only was considered. The merits of several visual rating methods are compared and discussed. 22 references, 5 figures, 11 tables.
Citation Formats
Macdowall, F D.H., Vickery, L S, Runeckles, V C, and Patrick, Z A.
Ozone damage to tobacco in Canada.
Canada: N. p.,
1963.
Web.
Macdowall, F D.H., Vickery, L S, Runeckles, V C, & Patrick, Z A.
Ozone damage to tobacco in Canada.
Canada.
Macdowall, F D.H., Vickery, L S, Runeckles, V C, and Patrick, Z A.
1963.
"Ozone damage to tobacco in Canada."
Canada.
@misc{etde_6296031,
title = {Ozone damage to tobacco in Canada}
author = {Macdowall, F D.H., Vickery, L S, Runeckles, V C, and Patrick, Z A}
abstractNote = {Tobacco weather fleck has caused significant losses of flue-cured tobacco in southern Ontario since 1955. Fleck damage was greatest near the coast of Lake Erie and decreased progressively inland. Ozone has been shown to be one of the most important incitants of the fleck response in tobacco whereas parasitic fungi, bacteria and viruses were proven not to be implicated as causes of the disorder. The inherently susceptible variety White Gold, used in all tests, was rendered more susceptible by irrigation and nitrogen deficiency. It was also more susceptible during flowering and when producing lateral shoots. The degree and duration of stomatal opening were important factors in determining the amount of injury. Concentration of ozone in the air was shown experimentally to affect the speed of fleck response as well as the severity of symptoms. Statistically significant correlations between ozone concentrations and fleck damage were obtained from field data when the response of highly susceptible tissues only was considered. The merits of several visual rating methods are compared and discussed. 22 references, 5 figures, 11 tables.}
journal = []
volume = {43:4}
journal type = {AC}
place = {Canada}
year = {1963}
month = {Dec}
}
title = {Ozone damage to tobacco in Canada}
author = {Macdowall, F D.H., Vickery, L S, Runeckles, V C, and Patrick, Z A}
abstractNote = {Tobacco weather fleck has caused significant losses of flue-cured tobacco in southern Ontario since 1955. Fleck damage was greatest near the coast of Lake Erie and decreased progressively inland. Ozone has been shown to be one of the most important incitants of the fleck response in tobacco whereas parasitic fungi, bacteria and viruses were proven not to be implicated as causes of the disorder. The inherently susceptible variety White Gold, used in all tests, was rendered more susceptible by irrigation and nitrogen deficiency. It was also more susceptible during flowering and when producing lateral shoots. The degree and duration of stomatal opening were important factors in determining the amount of injury. Concentration of ozone in the air was shown experimentally to affect the speed of fleck response as well as the severity of symptoms. Statistically significant correlations between ozone concentrations and fleck damage were obtained from field data when the response of highly susceptible tissues only was considered. The merits of several visual rating methods are compared and discussed. 22 references, 5 figures, 11 tables.}
journal = []
volume = {43:4}
journal type = {AC}
place = {Canada}
year = {1963}
month = {Dec}
}