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occurrence of copper-resistant strains and a shift in xanthomonas spp. causing tomato bacterial spot in ontario.field strains of tomato bacterial spot pathogen (xanthomonas euvesicatoria, x. vesicatoria, x. perforans, and x. gardneri) were characterized for sensitivity to copper and species composition. a total of 98 strains were isolated from symptomatic leaf and fruit samples collected from 18 tomato fields in ontario. in greenhouse pathogenicity tests, most of the field strains caused severe (37 strains) to highly severe (23 strains) symptoms on 'bonny best' tomato plants, whereas 38 strains caused mod ...201526308592
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