Abstract

DUMMEL, Delia M. et al. Avances sobre la caracterización del “mal de la tela” en plantas de yerba mate Ilex paraguariensis A. St. -Hil. RIA. Rev. investig. agropecu. [online]. 2022, vol.48, n.2, pp.188-194. ISSN 1669-2314.

Yerba mate (Ilex paraguariensis A. St. Hil.) is a primary and important crop in northeastern Argentina. In past years, a disease called white thread blight caused by Ceratobasidium niltonzousanum is having a very important impact in the production and has not been well characterized. Thus, the objective of this work was to complement the knowledge with symptom descriptions, morphological and molecular characterization of the causal agent, and pathogenicity tests. Signs of the disease include white mycelial cords visible on the infected branches and leaves with twig dieback, diseased leaves dry up but remain attached to the plant hanging by the fungal hyphae. Symptomatic leaves and branches were sampled from different parts of the province of Misiones. The causal agent was isolated for its subsequent morphological and molecular characterization. The colonies grow rapidly on PDA (potato dextrose agar) and are white at the beginning but later become light brown.

With the morphological characterization it was possible to determine that the fungus is distributed in different parts of the province of Misiones, affecting the plantations at different levels of incidence. Pathogenicity tests conducted in the laboratory allowed to know the progress of the disease under favorable environmental conditions. This work constitutes a contribution to the knowledge of this disease that affects yerba mate plantations.

Keywords : binucleate Rhizoctonia; pathogenity test; phylogeny; yerba mate..

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