Botrytis cinerea, new pathogen infecting oregano crops in Argentina.
In October 2013, oregano (Origanum vulgare subsp. hirtum) plants with necrotic leaves and cankers on the stems were observed at Tres Esquinas (Mendoza, Argentina). The necrosis had a basipetal progress, affected the centre of the bush and, in some cases, resulted in the death of the plant. The causal pathogen was identified as Botrytis cinerea based on morphological, genetic (ITS) and pathogenicity analyses. This is thought to be the first report of B. cinerea affecting oregano crops in Argentina.