Ceratobasidium sp. AG-A, ROOT PATHOGEN OF Calibrachoa hybrida

Nicolás P.  Borrelli; María Virginia  Moreno; Sebastián  Stenglein; Santiago  Stancanelli; Eduardo R.  Wright; Marta C.  Rivera

doi:10.29393/CHJAA38-20CANM60020

Autores/as

Nicolás P. Borrelli Instituto Nacional de Tecnología Agropecuaria, Instituto de Floricultura. Buenos Aires, Argentina; Universidad de Buenos Aires, Facultad de Agronomía, Ciudad Autónoma de Buenos Aires, Argentina.
María Virginia Moreno Universidad Nacional del Centro de la Provincia de Buenos Aires, Facultad Agronomía, Laboratorio de Biología Funcional y Biotecnología (BIOLAB)-CONICET-CICBA. Buenos Aires, Argentina.
Sebastián Stenglein Universidad Nacional del Centro de la Provincia de Buenos Aires, Facultad Agronomía, Laboratorio de Biología Funcional y Biotecnología (BIOLAB)-CONICET-CICBA. Buenos Aires, Argentina.
Santiago Stancanelli Instituto Nacional de Tecnología Agropecuaria, Instituto de Floricultura. Buenos Aires, Argentina.
Eduardo R. Wright Universidad de Buenos Aires, Facultad de Agronomía, Ciudad Autónoma de Buenos Aires, Argentina.
Marta C. Rivera Instituto Nacional de Tecnología Agropecuaria, Instituto de Floricultura. Buenos Aires, Argentina; Universidad de Buenos Aires, Facultad de Agronomía, Ciudad Autónoma de Buenos Aires, Argentina.

DOI:

https://doi.org/10.29393/CHJAA38-20CANM60020

Palabras clave:

ornamental plant, Rhizoctonia, fungus, wilt, rot

Resumen

Calibrachoa (Calibrachoa hybrida, Solanaceae) is an annual flowering ornamental plant, which is widely used in landscape design. In October 2019, 5% of the plants grown in a greenhouse in Buenos Aires, Argentina, showed a sudden wilt characterized by chlorosis, loss of turgor, and root rot. The objective of this study was to identify the causal agent of the disease. Five morphologically identical isolates developed from the roots of wilting plants. One of the isolates was selected and identified using morphological and molecular markers, while its pathogenicity was confirmed by Koch’s postulates. The obtained results allow concluding that Ceratobasidium sp. AG-A (anamorph Rhizoctonia sp.) is the causal agent of the disease. To the best of the authors’ knowledge, this is the first report of Ceratobasidium sp. as pathogen of calibrachoa in the world.