Antagonism of Trichoderma harzianum and Trichoderma viride on isolates of Fusarium spp. from Nicotiana tabacum

Tobacco production is a key line in the Cuban economy and generates largest income agricultural sector. Within phytopathogens affecting this plant, Fusarium spp., constitutes pest of interest, due to vascular involvements that cause deterioration commercial value leaf. Therefore, research was carried out with aim determining antagonistic activity vitro native strains Trichoderma harzianum T. viride on isolates oxysporum F. phyllophylum, from Nicotiana tabacum L. Granma province, Cuba. The work at Laboratory Agricultural Microbiology, University Granma. Half dextrose potato agar prepared establish dual crops spp. vs. Once treatments were established incubation time had elapsed, percentage inhibition mycelial growth, capacity mycoparasitic determined. A fully randomized design four replicas per treatment used two factorial ANOVA Tukey test (p≤0.05) for statistical processing. It shown recorded intermediate values phytopathogenic inhibition, competitiveness antagonist mostly located class Bell scale it found penetration, winding, vacuolization, deformation granulation constitute main forms mycoparasitism. Which points biocontrol method as an alternative consider management tobacco agroecosystems.