Abstract

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.

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

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