Inhibición del crecimiento in vitro de Fusarium sp. aislado de chile habanero (Capsicum chinensis) con hongos antagonistas
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Abstract
Fusarium species are causal agents of plant diseases causing symptoms in root, stem and leaf in different crops included pepper. Antagonists such as the fungus Trichoderma are an alternative in the control of plant pathogens fungi. The percentage of radial growth inhibition of Fusarium sp. isolated from habanero pepper (Capsicum chinensis Jacq.) by fungal antagonists was evaluated. For the bioassay were evaluated two reference strains Trichoderma harzianum, named Th-itver and Trichoderma sp. H2; three natives isolates (L2, P3 and P4) isolated from soil samples of Yucatán, México, identified as Trichoderma; and H3 native strain, identified as belonging to the genus Aspergillus. The evaluation was carried out by dual confrontation test in potato-dextrose-agar (PDA). All Trichoderma strains inhibited the radial growth of Fusarium sp. from 40 to 82%. The growth inhibition zone caused by Trichoderma H2 (82.2 %) was higher compared to that caused by the rest of the isolates. The isolates H2, P3 and P4 showed the ability for growing on the pathogen suggesting that the mechanism of antagonistic activity is by parasitism.
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