Trichoverin – a bio-preparation used in agriculture. The preparation contains the active ingredient Trichoderma viride, with a titre of not less than 2.0*109 IU/cm3. Application method – spraying crops during the vegetation period. Trichoverin is used for open-field cucumber crops. The preparation is applied at a rate of 2.0–3.0 liters per hectare, three times. The manufacturer of the preparation is the State Institution «Lviv Regional Phytosanitary Laboratory», located in the city of Dubliany, Lviv Oblast, Ukraine. The preparation belongs to the category of biological plant protection agents and is used for the prevention and control of plant diseases.