Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

First report of an alternaria leaf spot caused by Alternaria brassicae on Crambe abyssinicia in Australia.

Abstract

Crambe abyssinica is grown sporadically worldwide for its value as a source of high erucic acid industrial oils and secondary commercial products. In September 2004, inspection of a small experimental field crop in Beverley, Western Australia, indicated the presence of significant leaf spotting prior to commencement of flowering. The disease symptoms included as many as 10 to 15 spot lesions per leaf that were generally rounded and varied between 0.5 to 11 mm in diameter. Clusters of these lesions were often associated with leaf region chlorosis where they occurred. More than 95% of the plants inspected showed these symptoms. The pathogen was identified as Alternaria brassicae. Since A. brassicae has already been reported on other species of crucifers Australia-wide, it may pose a threat to any potential Crambe spp. industry in Australia.