First report of Plectosporium blight on pumpkin and squash caused by Plectosporium tabacinum in North Carolina.
In July of 2013, approximately 15% of zucchini squash (Cucurbita pepo) cultivars Zephyr and Senator grown in an organic commercial field in Davidson County, North Carolina, USA, showed spindle-shaped, corky, sunken, tan lesions on the stems and petioles and circular, corky, raised, tan lesions on the leaves and fruit. In September 2013, approximately 10-20% of the pumpkin cv. Field Trip at research station fields in Ashe and Haywood Counties also showed stem, leaf and fruit lesions. The causal pathogen was identified as Monographella cucumerina based on cultural, morphological, genetic (ITS) and pathogenicity analyses. This is thought to be the first report of M. cucumerina on pumpkin and squash in North Carolina, USA.