First Outbreak of Bacterial Black Rot on Cabbage, Broccoli, and Brussels Sprouts Caused by Xanthomonas campestris pv. campestris in the Mediterranean Region of Turkey

Plant Disease
M MirikF Sahin

Abstract

During warm and humid periods in the winters of 2004 to 2006, severe leaf necrosis and vein rot symptoms were observed on cabbage (Brassica oleracea var. capitata L.), broccoli (Brassica oleracea var. italica Plenck.), and Brussels sprouts (Brassica oleracea var. gemmifera D.C.) in the Mediterranean Region of Turkey. Symptoms were characterized by yellow, V-shaped areas of the leaf margin, with the internal tissue turning from brown to black. Infected seedlings were also observed in commercial nurseries in Adana with a disease incidence of nearly 10 to 25%. Isolations made from leaves and veins of the affected plants on yeast dextrose calcium carbonate agar yielded yellow, mucoid, and convex colonies. Twenty isolates recovered from diseased leaf samples were selected at random to identify the causal organism. All isolates were nonspore forming, gram negative, rod shaped, motile, aerobic, oxidase-negative, catalase-positive, and amylolytic-positive (3). All isolates induced hypersensitive responses on tobacco (Nicotiana tabacum cv. Samsun). The isolates were identified as Xanthomonas campestris pv. campestris on the basis of fatty acid methyl ester (FAME) profiles determined by Sherlock Microbial Identification System software (...Continue Reading

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