PRIMER REPORTE DE Botryodiplodia sp. CAUSANDO CANCROS EN Cedrela balansae EN EL NOA-ARGENTINA

GRIGNOLA JOSEFINA; CHACÓN FLORENCIA ISABEL; DELGADO MIGUEL ERNESTO; FEYLING MARIO; CARBAJO ROMERO MARIA SOLEDAD; HEREDIA ANA MICAELA; SARAVIA PABLO; FORNES LUIS

Tafi Viejo

Jornada; XXXVI Jornadas Científicas de la Asociación de Biología de Tucumán; 2019

Asociación de Biología de Tucumán

Abstract. Cedrela balansae is a forest species of the Argentine Yungas with woods of high economic value. In its natural habitat, it is a species that does not present important pathologies cited so far. However, outside of its protected environment (open sky) and under conditions of stress, the tree evidenced symptoms of a disorder that affects cortical tissues. As of 2017, we have observed elongated cankers of different magnitude in young and lignified tissues that developed to produce necrosis and decay of the plants. To identify the causative agent of this symptom, samples were taken in a 7-year-old C. balansae plantation located in the depressed plain of Famaillá, Tucumán. Samples of wood with cankers were collected and carried to the laboratory of Phytopathology of the EEA-INTA Famaillá. Small pieces of diseased tissue were superficially disinfected with ethanol 70% and sodium hypochlorite 5% and seeded in Petri dishes with potato dextrose agar (PDA). The colonies were initially white changing to dark grayish-green. Globose pycnidia were developed with conidiophores attached to the walls of the fruiting body. For all these reasons and the arguments described in Barnett and Hunter (1998), genus Botryodiplodia was identified as responsible for the described symptoms. This constitutes the first report in the NOA (Argentine Norwest) referring to the death of branches and plants of C. balansae outside the optimal cultivation zone that is associated with Botryodiplodia. The information generated will allow the adjustment of subsequent epidemiological studies and their control.