Early blight of tomato, caused by Alternaria solani, was considered economically as the most important disease of tomatoes in many areas of the world. Several methods were used to control the disease including cultural methods, resistant cultivars, compost and fungicides. Also, three years crop rotation was recommended for the control of A. solani in potato or tomato. No immunity to early blight has been found in commercial tomato cultivars or in their wild parents, but a reasonable level of resistance is available in some commercial cultivares.
Early blight attacks the leaves of tomato. Trichoderma is not usually found on leaves, so it will not compete there effectively.
Instead look at yeasts and Bacillus isolates with biocontrol capabilities because they can be found on the leaves of tomatoes, naturally.
Depends to the Trichoderma spp. used. I would suggest to start with some in vitro antagonistic testings.
Please have a look at the following RG link.
Article Evaluation of some fungitoxicants for controlling tomato ear...
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