Control of Bacterial Spot of Pepper Initiated by Strains ofXanthomonas campestrispv.vesicatoriaThat Differ in Sensitivity to Copper

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Abstract
Differences in sensitivity to Cu were detected among strains of X. campestris pv. vesicatoria. Sensitivity was judged on the basis of viability of cells after exposure to Cu solutions. The solutions were obtained from suspensions of fixed Cu in water of pH 7.0-7.5. The amounts of Cu in solution in the suspensions were 1-2 mg/l-1. Adding mancozeb to a suspension of the fixed Cu increased soluble Cu to about 13 mg/l-1. Strains sensitive to Cu were killed by both solutions, but Cu-resistant strains were killed only by the higher amount of soluble Cu. In the field, sprays of fixed Cu controlled sensitive strains only. Sprays of the Cu-mancozeb mixture controlled both strains of the bacterium but greater control of the Cu-sensitive was obtained.

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