Abstract

MARTINEZ, Benedicto; OBRET, Yalainne; PEREZ, Simón  and  REYES, Yusimy. In vitro antagonism of Trichoderma spp. strains against Sarocladium oryzae (Sawada) W. Gams & D. Hawksworth. Rev. Protección Veg. [online]. 2014, vol.29, n.2, pp. 106-111. ISSN 1010-2752.

Twenty seven isolates of Trichoderma spp. were evaluated against two of Sarocladium oryzae (Sawada) W. Gams & D. Hawksworth (S. o-2 y S. o-4) in dual culture. The action modes in the different interaction phases was determined by comparing the growth of Sarocladium colonies. The data were analyzed using Student`s t test. With isolates S. o-2 and S.o 4,competition by the substrate was shown by 81,48% of the Trichoderma isolates, 25,93% antibiosis and 11,11% mycoparasitism. Two Trichoderma isolates (T.4 and T.5) against the isolate S. o -4 showed the three antagonism types, whereas against S. o-2, they showed only competition for the substrate. This is an evidence of sensitivity variability of the phytopathogen isolates against the antagonist. Among the Trichoderma isolates, T.29 ,with a marked antibiotic effect, and T.6, with more than two antagonism types, were the most promising against both pathogen isolates.

Keywords : subtract competence; mycoparasitism; dual culture.

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