Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

First report of blackleg of potato caused by Dickeya solani in Brazil.

Abstract

In May 2013, unusual high incidence of blackleg symptoms, attributed to a contaminated lot of imported seed tubers, was observed in potato (Solanum tuberosum cv. Taurus) in a commercial field in Minas Gerais, Brazil. Diseased plants displayed typical blackleg symptoms and yielded soft rotted tubers. Bacterial isolates were obtained on Kado 523 medium and four isolates (CL139-IBSBF 3229, CL140-IBSBF 3230, CL141-IBSBF 3231, CL142-IBSBF 3232) from symptomatic plants were determined as member of genus Dickeya based on biochemical and molecular tests. Further investigations involving PCR assay and 16S rDNA and dnaX gene sequence analysis as well as pathogenicity test identified the pathogen as D. solani. This is thought to be the first report of potato blackleg caused by D. solani in Brazil.