Pecan (Carya illinoinensis) is a new crop in Argentina. The planted area is expanding quickly with around 4000 h in the Pampas region. In 2007 and 2008 typical scab symptoms on seedlings and mature trees were commonly observed in La Plata. A Cladosporium-like fungus was isolated on potato dextrose agar (PDA) from surface-sterilized pecan leaves collected from the Experimental Station of UNLP. Fungus' characteristics agree with a published description of Cladosporium caryigenum (Gottwald, 1982).Centro de Investigaciones en FitopatologíaFacultad de Ciencias Astronómicas y Geofísicas