DOI:
https://doi.org/10.14483/2256201X.21080Published:
2024-06-27Issue:
Vol. 27 No. 2 (2024): July-decemberSection:
Scientific articlePrimer reporte Kretzschmaria zonata (Lév.) P.M.D. Martin causando pudrición de la raíz en Tectona grandis L. en Costa Rica
First Report of Kretzschmaria zonata (Lév.) P.M.D. Martin Causing Root Collar Rot in Tectona grandis L. in Costa Rica
Keywords:
Ascomycota, forest diseases, tropical plantations, teak, Xylariaceae (en).Keywords:
Ascomycota, enfermedades forestales, plantaciones tropicales, teca, Xylariaceae (es).Downloads
Abstract (es)
Se encontraron árboles enfermos en plantaciones de Tectona grandis en la provincia de Guanacaste, Costa Rica, que mostraban síntomas de pudrición del cuello y la raíz. A nivel morfológico y molecular, se identificó la especie Kretzschmaria zonata como el agente causal de la enfermedad. El micelio del patógeno creció de forma circuncéntrica en un medio PDA, con coloración gris en el centro y blanca en los bordes. Se registraron ascosporas de color café oscuro, cuyo tamaño era (21.6-) 27.4 – 32.1 (-33.5) x (6.2-) 8.7 – 10.9 (-11.8) µm. Las plantas inoculadas con el patógeno presentaron lesiones, con diferencias altamente significativas respecto a las plantas testigo. Se realizaron reaislamientos y se recuperó el hongo K. zonata, cumpliendo con los postulados de Koch. Es la primera vez que se reporta este patógeno causando enfermedad en plantaciones forestales de teca en Costa Rica, lo que constituye un avance para el estudio de estrategias de manejo de la enfermedad.
Abstract (en)
Diseased trees were found in Tectona grandis plantations in the province of Guanacaste, Costa Rica, showing symptoms of collar and root rot. At the morphological and molecular level, the species Kretzschmaria zonata was identified as the causal agent of the disease. The pathogen's mycelium grew in a concentric form on PDA medium, with a gray coloration in the center and a white one at the edges. Dark brown ascospores were recorded, measuring (21.6-) 27.4 – 32.1 (-33.5) x (6.2-) 8.7 – 10.9 (-11.8) µm. Plants inoculated with the pathogen developed lesions, with highly significant differences compared to control plants. Re-isolations were performed, and the fungus K. zonata was recovered, fulfilling Koch’s postulates. This is the first time that this pathogen has been reported as causing disease in teak forest plantations in Costa Rica, which constitutes an advancement in the study of management strategies regarding this disease.
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