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Abstract

Relative aggressiveness of eight strains of Xanthomonas campestris pv. citri was tested on detached citrus leaves at 22°C and of another seven at 24°C. An the strains showed variability in their relative aggressiveness as measured through development of lesions. Number of lesions produced by any strains was significantly affected by the strain: cultivar interaction thus indicating host parasite specificity for this character. Three levels of aggressiveness i.e. high, intermediate and low aggressiveness were noticed among the strains.

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