Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

First report of Turnip mosaic virus infecting Brassica carinata (Ethiopian mustard) in the United States.

Abstract

Virus-like leaf symptoms including mosaic, ringspot, mottling, and puckering were observed on B. carinata (cultivars 080814 EM and 080880 EM) in field trials at Quincy, Florida, USA, during spring 2013, with disease incidence of >80%. A more extensive survey of the same field location indicated that mosaic symptoms were the most common. Viral inclusion assays of leaves with a range of symptoms indicated the presence of potyvirus-like inclusion bodies. Based on RT-PCR assays and BLAST analysis of the obtained sequences, the pathogen was identified as Turnip mosaic virus (TuMV). TuMV has been reported from B. carinata in Zambia. This is thought to be the first report of its occurrence on B. carinata in the United States.