First report of seedling blight of Eastern poison ivy (Toxicodendron radicans) by Colletotrichum fioriniae in Virginia.
Poison ivy (Toxicodendron radicans) drupes were collected from solitary lianas in Roanoke and Montgomery counties, Virginia, USA. These drupes were subjected to experiments aimed at producing sterile seedlings. However, there was extensive blighting and wilting in the germinated seedlings. Associated with the drupes and seedlings was a fungus with white to pale olivaceous grey mycelium with orange blister-like conidiomata and sclerotial masses enclosing the drupe mesocarp as well as conidiomata emerging from blighted, necrotic leaves. The causal pathogen was identified as Colletotrichum fioriniae based on cultural, morphological, genetic (PCR) and pathogenicity analyses. This is thought to be the first report of seedling blight of Eastern poison ivy caused by C. fioriniae in Virginia, USA.