Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

First report of citrus canker caused by Xanthomonas citri in Somalia.

Abstract

During 2006 and 2007, hyperplasia-type lesion, often surrounded by a water-soaked margin and yellow halo, typical of citrus canker were found on 8- to 10-year-old lime (Citrus limetta) and grapefruit (Citrus paradisi) trees in northern and southern Somalia, respectively. Isolations were made from several lesions from each sample onto yeast-dextrose-CaCO3 agar. Yellow, xanthomonad-like mucoid, convex colonies were purified and stored on YDC slants. Phenotypic tests and real-time PCR assays were done. Based on these tests, the pathogen was identified as Xanthomonas citri (syn. Xanthomonas axonopodis pv. citri). Upon conducting pathogenicity tests, symptoms typical of X. citri were observed on inoculated plants. This is thought to be the first report of X. citri on citrus plants in Somalia.