Resumen

DEYANIRA, Rivero et al. In vitro ANTIFUNGAL ACTIVITY OF K1 AND SIGMA CHITOSANS AGAINST Bipolaris oryzae (B. de Haan) Shoem. Rev. Protección Veg. [online]. 2008, vol.23, n.1, pp. 43-47. ISSN 2224-4697.

To determine the antifungal activity of chitosan against Bipolaris oryzae, which is a pathogen with the highest incidence in the rice spotted grain disease and the causal agent of brown leaf spot, the in vitro effect of different concentrations (300, 500, 700 and 1000 mg/L) of K1 (INCA) and SIGMA chitosans on fungal mycelial growth was studied. The colony diameter was measured after 3, 4, 5, 6 and 7 days, and the inhibition percentage of fungal mycelial growth compared with the non-treated control was calculated. The fungicide effect of the product for the treatment that totally inhibited the fungus was determined. The results indicated that both products had an inhibitory effect on fungal growth at all evaluated concentrations. SIGMA chitosan showed a total inhibition at 1000 mg/L, besides its fungicide effect.

Palabras clave : chitosan; Bipolaris oryzae; antifungal activity.

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