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Marssonina coronaria, new causal agent of leaf spots in apple trees with low chilling requirements in central Argentina. During 2017-2018 years, a fungal disease caused signifi cant early defoliation on cvs `Caricia ́, `Princesa ́ and `Eva ́ apples trees in the center-east of the Province of Santa Fe. The symptomatology was consistent with that reported for Marssonina spp. With the purpose of characterizing the etiology of the disease, 9 isolates were obtained; being 4 characterized morphometrically and molecularly. After 60 days, the colonies reached 10 mm in diameter, with irregular margins and brown coloration. Conidia were hyaline, slightly curved, obovoid, unequally two-celled. The size was 15.23 ± 1.49 μm x 5.47 ± 0.52 μm. The isolates were identifi ed with 100% identity as Marssonina coronaria based on ITS gene phylogenetic analyses. The pathogenicity of the isolates was confi rmed. All inoculations produced symptoms and the pathogen was re-isolated, corresponding its characteristics with those initially mentioned. This study is the fi rst report of M. coronaria affecting apple leaves in Argentina and provides useful information to design management strategies.

Marssonina coronaria, NUEVO AGENTE CAUSAL DE MANCHAS FOLIARES EN MANZANOS DE BAJOS REQUERIMIENTOS DE FRIO DEL CENTRO DE ARGENTINA