An embodiment of the present invention is a Trichoderma atroviride SC1, CBS no 122089, as a biocontrol agent, i.e. to treat fungal diseases of plants. The second embodiment of the present invention is an agricultural composition comprising the Trichoderma atroviride SC1 as the active principle in an effective amount. The compositions of the present invention may further comprise a second biocontrol agent and/or an additive, an emulsifier, a plant nutrient, a wetting-agent, a plant micro-nutrient or a substratum, wherein said substratum is selected from the group consisting of: a nutrient culture medium, a cereal or a derivative thereof, an amendant, a vegetable or a part thereof, peat, wood or a piece thereof, clay or barks.
