Abstract: The invention relates to a method and fungicide for protecting flowering plants, bushes, trees and like plants against attack from pathogenic fungi, by treating the plants with fungi which are antagonistic toward the pathogenic fungus, wherein the earth in which the flowering plants, bush, tree or like plant is intended to grow, or grows, is treated with a product obtained by cultivating the antagonistic fungus on a cultivating substrate comprising compost material obtained by biologically decomposing organic compostible material and treated for exterminating microorganisms which inhibit cultivation of the antagonistic fungus. The invention also relates to a method for producing a fungicide which will protect flowering plants, bushes, trees and like plants from attack in accordance with the above.