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Host range of strains of pseudomonas syringae pathovar tagetis


, : Host range of strains of pseudomonas syringae pathovar tagetis. Plant Disease 69(7): 589-591

Using different inoculation techniques, the host range was determined for P. syringae pathovar [p.v.] tagetis strains isolated from marigold, sunflower, common ragweed, Jerusalem artichoke, and a presumptive strain from dandelion. Wound inoculation induced apical chlorosis in all hosts except dandelion, which exhibited no symptoms. With spray inoculation, ragweed became infected but only with strains isolated from this host; other hosts, except dandelion, exhibited leaf spots with apical chlorosis with all strains. Dandelion became temporarily chlorotic only when the inoculum was infiltrated into the leaf with a hypodermic syringe. Despite its apparent inability to infect dandelion, this strain appears to be p.v. tagetis based on the distinctive symptoms it induces on marigold, its microbiological characteristics, and its fatty acid ester profile.

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