Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

First report of Sclerotium stem rot caused by Athelia rolfsii on Stevia rebaudiana in southwestern France.

Abstract

In August 2017, disease symptoms similar to a sudden wilting were observed in a Stevia rebaudiana 0.5-ha commercial field in Sainte-Livrade, France. Symptoms first appeared on the aerial parts, resulting in wilting and drying of the entire plant. Additional symptoms included lesions on the stem at the collar base with abundant white mycelium, and round white to dark-brown small globoid sclerotia were observed on diseased plants. These symptoms were also observed on nearby pepper crops. The outbreaks of infection were increasing with time. Disease incidence was estimated at approximately 17%. The causal pathogen was isolated and identified as Athelia rolfsii based on morphological characteristics, molecular data (nucleotide sequences and phylogenetic analysis) and pathogenicity test. This is thought to be the first report of A. rolfsii causing Sclerotium stem rot on S. rebaudiana in France.