Identification of Epicoccum sorghinum as the agent of Hydrangea leaf spot and its sensitivity to fungicides

Abstract

Hydrangea macrophylla belongs to the family Saxifragaceae. It originated in Sichuan and Japan and is widely cultivated in Europe, Holland, France, and other places. H. macrophylla is the most commonly cultivated species of the genus and is known for its large, showy flowers and lush green leaves (Alexander, 2017;Bak et al., 2021). Owing to its distinct flower shape, symbolizing reunion, happiness, and hope, H. macrophylla has high ornamental value and is commonly grown in family gardens, parks, and scenic landscapes. Moreover, this species is grown for high-end, fresh-cut flower markets.The increasing demand for a potted version of H. macrophylla has gradually expanded its production and cultivation in Guizhou Province. However, corresponding increases in the occurrence of diseases and pests, such as leaf spots, root rot, and anthracnose, restrict production and industrial development to varying extents.Various leaf spot pathogens of H. macrophylla have been reported worldwide. The pathogens reported in Italy include Phoma exigua