First report of Globisporangium attrantheridium causing root rot of Gynostemma pentaphyllum

Abstract

Gynostemma pentaphyllum, also known as Jiao-Gu-Lan, is a perennial liana belonging to the family Cucurbitaceae. This plant has been used as a traditional folk medicine for the treatment of various human diseases. In May 2020, G. pentaphyllum cultivated at the Research Station of Medicinal Plants at Tam Dao, Vinh Phuc, Vietnam was affected severely by root rot disease, resulting in leaf yellowing, wilting, and death. Based on morphology and sequence analysis of the ITS region, the pathogen was identified as Globisporangium attrantheridium. Koch's postulates were fulfilled. This is the first report of Gl. attrantheridium as a pathogen causing root rot on G. pentaphyllum. This finding will be of importance for effective disease management.

First report of wilt and root rot on bell pepper (Capsicum annuum) caused by Thielaviopsis ethacetica

“…A stem‐streaming test was performed but no bacterial streaming was recorded, thus indicating Ralstonia solanacearum , the bacterium causing pepper bacterial wilt, was not responsible. Diseased roots were surface sterilised (Chu et al., 2022). Small sections of symptomatic roots were placed on potato dextrose agar (PDA) amended with chloramphenicol (50 mg/l).…”

“…Ten sixty‐day‐old bell pepper plants grown in a greenhouse in 10‐cm‐diameter pots, containing a 4:1 w/w mixture of field soil and sand, were used to confirm the pathogenicity of isolate TROC‐2. TROC‐2 was cultured in a mixture of rice hulls and millet (Chu et al., 2022). A mixture containing TROC‐2 mycelia or the pathogen‐free mixture was mixed with the soil in the pots.…”