Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

First report of Alternaria alternata causing leaf blight of onion in South Africa.

Abstract

During the onion planting season in 2013, blight-like symptoms were observed on leaves of onion plants at the onion seed multiplication site of the Agricultural Research Council-Vegetable and Ornamental Plant Institute, South Africa. The causal pathogen was identified as Alternaria alternata based on morphological, genetic (ITS) and pathogenicity analyses. This is thought to be the first report from South Africa of this fungus being isolated from onion, suggesting a risk for onion industries in the region.