Resumen

FERNANDEZ, L et al. Marssonina coronaria, nuevo agente causal de manchas foliares en manzanos de bajos requerimientos de frío del centro de Argentina. FAVE. Secc. Cienc. agrar. [online]. 2020, vol.19, n.1, pp.43-53. ISSN 1666-7719.

During 2017-2018 years, a fungal disease caused significant 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 identified with 100% identity as Marssonina coronaria based on ITS gene phylogenetic analyses. The pathogenicity of the isolates was confirmed. All inoculations produced symptoms and the pathogen was re-isolated, corresponding its characteristics with those initially mentioned. This study is the first report of M. coronaria affecting apple leaves in Argentina and provides useful information to design management strategies.

Palabras clave : Marssonina coronaria; defoliation; low-chilling apple; Santa Fe.

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