Synergistic composition, use thereof and process for preparing same, use of a plant growth regulator, fungicide, insecticide, or acaricide, methods for decreasing the excessive growth of corn plants, for making the culm, root system and adventitious roots of corn plants stronger, for combating pests and providing resistance in combating pests, as well as a method for identifying a composition that will ensure high productivity of crops. The present invention relates to a synergistic composition, comprising a plant growth regulator and/or fungicide and/or insecticide and/or acaricide, and the process for preparing same. The invention also discloses the use of a plant growth regulator and/or fungicide and/or insecticide and/or acaricide for preparing a synergistic composition and the use of a composition to ensure high productivity per unit area of a corn crop. Methods for decreasing the excessive growth of corn plants, for making the culm, root system and adventitious roots of corn plants stronger, for combating diseases and pests, for providing resistance in combating pests, and also a method for identifying a composition that will ensure high productivity of corn crops are also provided.
