Abstract

CARRERO, Chrystian et al. Identificación y sensibilidad in vitro a fungicidas del agente causal de la podredumbre del tallo en plántulas de Eucalyptus cinerea en Mérida, Venezuela . INCI [online]. 2003, vol.28, n.11, pp.656-659. ISSN 0378-1844.

On November 2001 a stem rot disease was detected on Eucaliptus cinerea seedlings grown under controlled conditions in a greenhouse at the Faculty of Forestry and Environmental Sciences of the Universidad de Los Andes, Merida, Venezuela. The disease killed 5% of the seedlings. Initial symptoms were appreciated as chlorosis, flabbiness and, finally, necrosis. The morphometric characteristics of reproductive structures allowed the identification of the pathogen as Botrytis cinerea Pers.: Fr. [teleomorph of Botryotinia fuckeliana (de Bary) Whetzel]. The predisposing factors in the disease development were high temperature (32ºC) and high relative humidity (80%). Pathogenicity tests confirmed, for the first time in Venezuela, the pathogenesis between B. cinerea and E. cinerea. In vitro sensitivity tests were carried out to evaluate the sensitivity of B. cinerea to the fungicides Benomyl, Myclobutanil, Azoxystrobin, Clorotalonil, Prochloraz and Mancozeb. The highest sensivity occurred with Prochloraz, which completely inhibited fungal growth.

Keywords : Botrytis cinerea; Eucalyptus cinerea; Podredumbre del Tallo; Fungicidas.