Web blight caused by Rhizoctonia solani AG-1 IB on Lychnis coronaria cultivated in Italy.
During the summer 2014, several plants of Lychnis coronaria growing in mix borders in a private garden in the north of Piedmont, showed symptoms of web blight on leaves and stems that turned brown, withered and died. The causal agent of the disease was isolated from affected plants and identified as Rhizoctonia solani by the features of mycelium observed on the microscope from pure colonies cultivated in vitro. The ITS (Internal Transcribed Spacer) analysis confirmed the identification. Then, R. solani from L. coronaria was characterized and included into the anastomosis group AG-1. Features of mycelium and sclerotia produced by pure cultures were typical of R. solani AG-1 IB. Finally, some strategies to prevent and to control R. solani on L. coronaria are discussed. This is the first report of R. solani on L. coronaria in Italy, as well as in the world.