Abstract

CADENA M, Freddy Antonio  and  POMA LOZA, Estanislao. Management of cacao moniliasis (Moniliophthora roreri) with the application of two Trichoderma species. RIIARn [online]. 2022, vol.9, n.2, pp.37-43. ISSN 2409-1618.  https://doi.org/10.53287/toks1912pc49l.

Cacao production in Bolivia is being threatened by the fungus Moniliophthora roreri. Despite efforts to combat it, production is declining by a good percentage. As part of the integrated management, it was proposed to find an antagonistic fungus, proposing Trichoderma sp., with the objective of verifying the antagonistic capacity of T. harziarum and T. viride. The evaluation was carried out in two phases, the first in vitro phase was performed in the Biotechnology laboratories of the Sapecho Experimental Station and the Phytopathology laboratory in the city of La Paz, both belonging to the Faculty of Agronomy, Universidad Mayor de San Andrés. The second in vivo phase was developed in cacao plots at the Sapecho Experimental Station. Both phases were carried out in nine months. In the dual in vitro test, a DCA design was used to verify the best antagonist, which was tested in a field plot under a DBA with treatments of 200 and 300 g of Trichoderma and a control to identify its behavior in field conditions for the control of M. roreri. Having carried out the dual test, it has been verified that the best antagonist is T. harziarum for having a mycelium growth inhibition percentage of 58.60 % (PICM), also in the Bell scale it is classified in a level of 1, being chosen for the application in field. In the field test Trichoderma harziarum was applied every 15 days, the treatments were Control (T1), application of 300 g of fresh Trichoderma (T2), and 200 g of fresh Trichoderma (T3), under a DBA, the evaluation shows that the treatment (T2) with 300 g was the one that achieved better results for the control of the disease, reducing the incidence in 6 % in relation to the control and the severity in 10.87 % in relation to the control. Comparing both methodologies, the laboratory test with the dual test controls 100% of M. roreri, in the field the meteorological conditions only partially control the causal agent of the Moniliasis disease.

Keywords : antagonist; inhibition; incidence; severity.

        · abstract in Spanish     · text in Spanish     · Spanish ( pdf )