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F 500 does not affect the infection potency of TMV. A TMV suspension (1 μg mL−1) was incubated, for 1 and 3 d, in the absence (−) or presence (+) of 0.5 mm F 500 under plant growth conditions. Tobacco leaf halves then were infected with the F 500-pretreated or -non-pretreated TMV suspension. TMV lesion size (±se) was determined 5 d postinfection.
