Abstract

LEIVA-MORA, Michel et al. Deightoniella torulosa (Syd.) M.B. Ellis, causing leaf spot in acclimatized Grande naine (Musa, AAA) plants. Rev. Protección Veg. [online]. 2013, vol.28, n.2, pp. 145-148. ISSN 1010-2752.

In the present work, some features concerning the morphological and pathogenic characterization of the causal agent of the leaf spotted disease in Grande naine (Musa, AAA) cultivar were studied. Morphological characterization of conidia and conidiophores were done under a light microscope using fragments of spotted leaves. Pathogenecity tests were performed on three-month-acclimatized Grande naine plants. Conidiophores were straight or slightly curved obpyriform to obclavate and subhyaline to olive in colour. Conidia size varied from 35-70 µm in length to 13-25µm in width, with 3-6 pseudosepta. Obpyriform to ellipsoid conidia were observed in Grande naine spotted leaves. The first symptoms appeared 14 days post inoculation (dpi) as black necrotic spots (1-2 mm diameter). They became oval with black border at 45-56 days post infection (dpi). This is the first report of Deightoniella torulosa (Syd.) M. B. Ellis causing leaf spot in acclimatized Grande naine plants.

Keywords : banana; pythopathogen.

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