AbstractExperiments with fungi causing damping off. II. Infections of conifer seedlings of different provenances with one or more damping‐off fungi and Triclioderma viride Pers. ex Fr.Provenances of native conifer seedlings show varying susceptibility to the agents of damping‐off. Following infections with damping‐off fungi together withTricboderma virideincreased disease symptoms often appeared. Thus the antagonist seemingly increases the susceptibility of the treated seed