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The biocontrol efficacy of  Trichoderma asperellum  strain M23 (bioagent) was tested against early blight pathogen ( Alternaria solani  strain NO4) of tomato. These fungi were co-inoculated on tomato plants (variety UC82B and Ibadan local) at different spore concentrations, viz., 1.0 × 10 5 , 1.0 × 10 7  and 1.0 × 10 9  while untreated plant served as control. The effect of these treatments was studied based on growth parameters, biomass and symptoms observed on disease incidence scale of 1–7. The pathogen exerted varying effects on the tomato plants as Ibadan local was more susceptible compared to UC82B. The bioagent M23 exhibited significant growth stimulatory effect ( p  &lt; 0.05) on the two varieties of tomato. The antagonistic effect of M23 against NO4 was confirmed on the growth, biomass accumulation (phytomass) and fruit weight of tomato plants co-inoculated with the pathogen and the antagonist. This study demonstrated the potentials of  Trichoderma asperellum  not only as biocontrol agent against early blight of tomatoes but also as growth stimulatory agent for the crop.

Efficacy of native Trichoderma asperellum in managing Alternaria solani causing early blight of Solanum lycopersicum Mill