Abstract: The present invention is directed to pesticidal compositions comprising indole derivatives. These indole derivatives are especially active against phytopathogenic fungi. Furthermore, the invention relates to the use of indole derivatives for the production of pesticides and the use of the compositions according to the invention as pesticides. The present invention is also directed to a process for producing a pesticidal composition and to pesticidal compositions prepared by this process. In addition, the invention relates to a process for preventing or combating pests and to a process for protecting plants against pests, especially against phytopathogenic fungi. Further, the invention is directed to plants or seeds as well as objects or materials which have been protected against pests by treatment with a composition according to the invention. Further, the invention is directed to a method for identifying a substance having pesticidal activity.