Trichoderma in the phytopathogenic biocontrol

Rodrigo Silva de Oliveira , Lillian França Borges Chagas, Albert Lennon Lima Martins, Manuella Costa Souza, Lisandra Lima Luz,

Abstract: Fungus of the genera Colletotrichum, Macrophomina and Curvularia are among the main fungi that cause disease in plants. The fungi Trichoderma are an important tool in the biological control of phytopathogens due to their mechanisms of competition, antibiosis and mycoparasitism. For this reason, the present study aimed to evaluate the efficiency of the antagonism in vitro of species Trichoderma to the pathogens Macrophomina sp., Colletotrichum gloeosporioides and Curvulária lunata. The isolates Trichoderma used were: T. harzianum (UFT-25), T. pinnatum (UFT-37), T. virens (UFT-57), T. asperelloides (UFT201) and T. longibrachiatum (UFT-204). In the biocontrol tests the percentages of colonization and inhibition were evaluated and scores were assigned on an adapted scale. The experimental design was completely randomized, in quadruplicate and analyzed in a 5 x 3 factorial scheme, with five isolated from Trichoderma and three pathogens. In the colony matching to C.gloeosporioides, the isolates UFT-25 (80.39%) and UFT-204 (79.88%) obtained a higher percentage of colonization, and the isolates UFT-201 (57.05%) and UFT -204 (56.57%) were more efficient in inhibiting the pathogen. For the pathogen Macrophomina sp. isolates UFT-25 (70.49%) and UFT-57 (73.10%) had a higher percentage of colonization, and isolates UFT-57(70.78%) and UFT- 04 (72.69%) were superior in inhibiting the pathogen. In the confrontation with C. lunata sp. isolates UFT-201 (80.39%) and UFT-204 (84.52%) provided a higher percentage of colonization, and the isolate UFT-201 (80.39%) was higher in the percentage of inhibition. All Trichoderma isolates are considered to be efficient antagonists.

Keywords: antagonist; biological control; pathogens

Date published: 2022-08-19