Pflanzenfreund
Member
Yes you are right!
according to this link http://ephytia.inra.fr/en/C/10914/Tobacco-Pollution-spots-weather-fleck : "The disease often occurs following prolonged rainy periods and during the active growth phase of tobacco, during which tissues are particularly succulent."
"In fact, the symptoms of "weather fleck" are induced by ozone (O3) which is an air pollutant affecting many plants. This gas is produced secondarily in the atmosphere as a result of chemical reactions involving primary pollutants such as nitrogen dioxide (NO2) and hydrocarbons (HC), this under the influence of solar radiation."
We had hot and dry weather the last days. This was followed with a thunderstorm last night. I might have given them too much water also, especially the potted Virginia wich has the most spots.
Thank you for such a fast answer
according to this link http://ephytia.inra.fr/en/C/10914/Tobacco-Pollution-spots-weather-fleck : "The disease often occurs following prolonged rainy periods and during the active growth phase of tobacco, during which tissues are particularly succulent."
"In fact, the symptoms of "weather fleck" are induced by ozone (O3) which is an air pollutant affecting many plants. This gas is produced secondarily in the atmosphere as a result of chemical reactions involving primary pollutants such as nitrogen dioxide (NO2) and hydrocarbons (HC), this under the influence of solar radiation."
We had hot and dry weather the last days. This was followed with a thunderstorm last night. I might have given them too much water also, especially the potted Virginia wich has the most spots.
Thank you for such a fast answer
