Tobacco brown spot

A.ltemaria spp. tobacco brown spot leaf spot of brassicas... 

Reinert, R. A., and H. W. Spurr, Jr. Differential effect of fungicides on ozone injury and brown spot disease of tobacco. J. Environ. Qual. 1 450-452, 1972. 

Plate 7. Sensitive tobacco plants (Nicotina tabacum L.. strain Bel W 3) with necrotic spots on leaves caused by ambient ozone, light brown spots having been induced by ozone injury 24 to 48 hrs ago. After longer time of exposure, dead tissue will be bleached. Phytotoxic concentrations of ozone in W. Germany have been demonstrated for the first time by the use of tobacco as indicator plant (Knabe et al.. 1973). Kettwig, W. Germany. l%7. 

Alternaria alternata is an airborne fungus. It causes the so-called brown spot, one of the most destructive leafspot diseases on tobacco, peppers, tomatoes, and other plants. Fungi Alternaria Alternaria species include arouud 50 kuown fungi) are commonly... 

T. causes diseases in plants by inhibition of protein and nucleic acid synthesis, e.g., leaf rot and brown spot disease in rice and tobacco. T. has antiviral and insecticidal activities and inhibits the growth of mammalian cell cultures. T. can occur in moldy tomatoes and apples as well as products produced therefrom. For structure activity relationships, see Lit.. ... 

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