Abstract
The percentage foliar injury on N. tabacum L. ''Bel W3'' infected by tobacco streak virus (TSV) and exposed to O3 was greater than the additive percentage foliar injury to either TSV-infected or O3-exposed plants. The fresh and dry wt of leaves, stems and roots of ''Bel W3'' exposed to O3, infected with TSV, or both, were significantly lower than the wt of the same parts from control plants. The growth-inhibiting effects of O3 and TSV were only additive.

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