Abstract
Thirty isolates of Xanthomonas campestris pv. vesicatoria (Xcv) from Tanzania were evaluated for sensitivity to copper sulphate (CuSO4:5H20) using dilution plate counts. Ninety-three percent (28/30) of the isolates produced countable colonies on nutrient glucose agar amended with 0.8 mM CuSO4. All the Xcv isolates (7/7) from Arusha (northern Tanzania) grew on the copper medium. Isolates of the pathogen from Iringa (southern Tanzania) produced variable results (15/21). However, neither of the two Xcv isolates from Morogoro (Eastern Tanzania) grew on the copper medium. These results indicate long-term exposure of Xcv isolates from Tanzania to selection pressure for copper tolerance. Key words: Xanthomonas campestris pv. vesicatoria, copper resistance, Tanzania.
Highlights
Bacterial leaf spot (BLS) of tomato (Solanum lycopersicum L.), caused by Xanthomonas campestris pv. vesicatoria
Presumptive Xanthomonas campestris pv. vesicatoria isolates from tomato fruit lesions, and one reference Xcv strain from The Göttingen Collection of Phytopathogenic Bacteria (GSPB), GSPB 2043 were tested for Xcv determinative characteristics, including Gram reaction, nitrate reduction, Kovac’s oxidase reaction, starch hydrolysis, pectin degradation, Biolog and hypersensitive reaction on tobacco leaves, following methods and classifications outlined in Schaad et al
Tobacco leaves inoculated with suspensions of the isolates showed a hypersensitive reaction within 24 h, and typical bacterial spot symptoms that were similar to natural symptoms developed on inoculated tomato
Summary
Bacterial leaf spot (BLS) of tomato (Solanum lycopersicum L.), caused by Xanthomonas campestris pv. vesicatoria Vesicatoria isolates from Tanzania to copper and implications for bacterial spot management Xcv isolates (7/7) from Arusha (northern Tanzania) grew on the copper medium.
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