Bacterial Blight of Onion, a New Disease Caused by Xanthomonas sp.

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Abstract
A new disease of green and bulb onion [Allium cepa] in Hawaii [USA] is caused by a previously undescribed Xanthomonas sp. Tip dieback, leaf lesions, chlorotic streaks and, eventually, necrosis of the entire leaf results in stunted plants and undersized bulbs at harvest. The pathogen was isolated from leaf lesions and inoculated onto 15 susceptible onion cultivars. Physiological and biochemical tests showed that the pathogen belonged to the X. campestris taxospecies, but that it differed from other Xanthomonas nomenspecies of the group in pathogenicity, serology and in utilization patterns of 122 C sources.

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