Abstract

GARRIDO RONDOY, Miguel  and  VILELA SEVERINO, Nasstie. Antagonistic capacity of Trichoderma harzianum compared to Rhizotecnia, Nakataea sigmoidea, Sclerotium rolfsii and its effect in native strains of Trichoderma isolated form rice crops. Scientia Agropecuaria [online]. 2019, vol.10, n.2, pp.199-206. ISSN 2077-9917.  http://dx.doi.org/10.17268/sci.agropecu.2019.02.05.

It has studied the antagonistic capacity a commercial Trichoderma harzianianum, against a Rhizoctonia spp., Nakatea sigmoide y Sclerotium rolfsii, causing the rot of stems and pods of rice, as well as its effect on 14 native strains of Trichoderma isolated of different rice fields. The in vitro test showed that T. harzianum presents a high antagonistic activity and hyperparasitica against Rhizotocnia. The greater action of mycoparasitism arose with Rhizotocnia, being very frequent the curl of hyphae and penetration; in Nakataea, only curl was observed and no curl was observed in Sclerotium. The development of strain of T. harzianum (comercial) does not affect the native strains of Trichoderma spp. Tested in this work, in most cases, strains of Trichodermas native showed a rapid development between 48 and 72 hours. Although the strains of Trichoderma native showed a greater vegetative development, the strain comercial T. harzianum generates a higher production of conidia, with an increase of 29.53% very important in the transmission and dissemination of these antagonists in the soil.

Keywords : Biological control; antagonism; native strains; Trichoderma spp; rice diseases.

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