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The interaction of biostimulant species of Trichoderma may have benefits to increase the production of metabolites involved in promoting plant growth; combining two organisms with a higher degree of antagonism could enhance their plant growth promoter effects. The objective of this study was to select in vitro native species of Trichoderma in a dual cultivation, and to evaluate their growth-promoting effect on Capsicum chinense. The selection of isolates in vitro was done by dual confrontations with the following characteristics: proportional growth of both isolates in the Petri dish; presence of mycelial barrier; and colour of the culture medium. The selected confrontations and their individual isolates were evaluated in plants of C. chinense cv. Mayapan. Also, two controls without fungal inoculation were assessed, one as control with 100% of the chemical fertilization (250N-200P-300K) recommended for the culture; and the second as control at 50%, with half of the indicated fertilization. Three applications of suspensions of 106 conidia mL-1 were made in the seedbed stage and another three during the growth of the culture. The effect of the treatments was evaluated through plant growth and crop production 145 days after sowing. The interaction of Trichoderma virens (Th05-02)/Trichoderma koningiopsis (Th41-11) was equal (p>0.05) to the 100% fertilized control in the variables evaluated. In addition, increases of 14.53% were recorded in plant height, 11.20% in stem diameter, 28.54% in foliar dry biomass, 12.97% in dry root biomass, 33.13% in a number of fruits, and 25.77% in the weight of fruits, compared to the control with 50% chemical fertilization. The species interaction of T. virens (Th05-02)/T. koningiopsis (Th41-11) exerted a plant growth promoting effect with 50% reduction in the recommended chemical fertilization for habanero pepper cultivation. [ABSTRACT FROM AUTHOR]