Resumen

MIGUEL-FERRER, Leydi et al. Antifungal activity of Trichoderma harzianum and T. koningiopsis against Fusarium solani in seed germination and vigor of Miahuateco chili seedlings. Rev. mex. fitopatol [online]. 2021, vol.39, n.2, pp.228-247.  Epub 03-Nov-2021. ISSN 2007-8080.  https://doi.org/10.18781/r.mex.fit.2101-5.

Chili is the second largest vegetable in Mexico. The objective of the investigation was to evaluate the in vitro and in vivo antagonistic activity of Trichoderma harzianum (T-H4) and T. koningiopsis (T-K11) versus Fusarium solani (MX-MIC 798) in the germination and establishment of seedling of chili Miahuateco. The dual culture technique was used to determine the percentage of radial growth inhibition (PRGI) of the MX-MIC 798 strain. In addition, the germination percentage in Miahuateco chili seeds was analyzed in nursery, as well as the mortality of seedlings and degree of severity at 40 days after transplantation (dat) in Santa María Tecomavaca, Oaxaca, through biocontrol and chemical control (Mancozeb 80®). The T-H4 strain presented the highest PIRG antagonic level (53.3%) in vitro and class II on Bell’s scale, also obtained 82% germination in Miahuateco chili seeds in nursery and 48% of field mortality; So, he matched chemical control and beat T. koningiopsis T-K11. The antifungal activity of Trichoderma spp., They offer an alternative for the biocontrol of the wilt and necrosis as a root in the cultivation of Miahuateco chili caused by F. solani MX-MIC 798.

Palabras llave : Antagonism; mycelial growth; PRGI; mortality; Capsicum.