Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

First report of white mold caused by Sclerotinia sclerotiorum on faba beans in North Dakota.

Abstract

Faba bean plants exhibiting white mould symptoms, characterized by white cottony mycelium of the pathogen growing on stems and bleached disease tissues, on the cultivar Tabasco were observed at the early pod-filling stage in research plots during late July 2017 at Langdon (North Dakota, USA) with a general incidence of 6%. Dark, round sclerotia, characteristic of those produced by Sclerotinia sclerotiorum, were observed by opening infected stems. Based on morphological characteristics, polymerase chain reaction assay and pathogenicity tests, the causal agent was identified as Sclerotinia sclerotiorum. White mould is endemic in North Dakota and causes economic losses on many economically important broad leaf crops including dry bean, canola, soyabean and sunflower. This is thought to be the first report of white mould occurrence on faba bean in North Dakota.