First report of Colletotrichum fioriniae causing anthracnose of elephant garlic (Allium ampeloprasum var. ampeloprasum) in New York, USA.
In July 2015 and 2016, an unusual disease was observed on scapes of approximately 10% of field-grown elephant garlic (Allium ampeloprasum var. ampeloprasum) growing in a field in Newark, New York, USA. Symptoms were sunken lesions up to 50 mm long, causing twisting, girdling and collapse of the scape. Lesions were initially cream to tan-coloured and became orange with the production of numerous acervuli without setae. Symptoms were confined to the scape. The causal pathogen was isolated and identified as Colletotrichum fioriniae based on morphological, molecular and pathogenicity analyses. The obtained sequences from 2 isolates were deposited in GenBank as accession numbers BD001 (KY886306-KY886309) and BD004 (KY886310-KY886313). This is thought to be the first report of anthracnose caused by C. fioriniae on A. ampeloprasum var. ampeloprasum in New York, USA.