First report of a leaf spot caused by Bipolaris oryzae on switchgrass in New York.
From 2007 to 2010, foliar lesions were observed on first year and mature switchgrass (Panicum virgatum) stands in various locations in New York, USA. Foliar lesions were purple, elliptical and occasionally with yellow halos and/or white necrotic centres. The pathogen was identified as Cochliobolus miyabeanus based on morphological, genetic (internal transcribed spacer) and pathogenicity tests. This is thought to be the first report of C. miyabeanus causing a leaf spot of switchgrass in New York, USA.