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First report of bacterial blight of carrot in Indiana caused by Xanthomonas hortorum pv. carotae

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In summer 2012, bacterial blight symptoms were observed on leaves of carrot plants in 7 out of 70 plots of carrot breeding lines at the Purdue University Meig Horticulture Research Farm, Lafayette, IN. Symptoms included small to large, variably shaped, water soaked to dry, necrotic lesions, with or without chlorosis. Microscopic examination of symptomatic leaf sections revealed bacterial streaming from the cut ends of each leaf piece. Colonies with morphology similar to that of isolate Car001 of Xanthomonas hortorum pv. carotae from Washington State were obtained consistently from all seven plots. All seven Indiana isolates and Car001 produced a 355 bp DNA fragment indicative of X. hortorum pv. carotae. Indian isolates were each tested for pathogenicity on 11-week-old carrot plants. Symptoms of bacterial blight were first observed 14 days after inoculation. To our knowledge, this is the first report of bacterial blight of carrot in Indiana.
L. J. du Toit , M. L. Derie , C. E. Christianson , L. Hoagland , P. Simon
DNA , Xanthomonas hortorum , breeding , breeding lines , carrots , chlorosis , horticulture , leaf blight , leaves , on-farm research , pathogenicity , plant pathogenic bacteria , summer , Indiana , Washington
USDA Scientist Submission
Plant disease 2014 5 v.98 no.5
Journal Articles, USDA Authors, Peer-Reviewed
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