The present invention relates to a composition comprising at least one biological control agent selected from the group consisting of Paecilomyces lilacinus strain 251 (AGAL No. 89/030550) and Coniothyrium minitons CON/M/91-08 (DSM 9660) and/or a mutant of these strains having all the identifying characteristics of the respective strain, and/or at least one metabolite produced by the respective strain that exhibits activity against nematodes, insects and/or phytopathogens, and at least and at least one further biological control agent (II) which is selected from the group consisting of bacteria in a synergistically effective amount. Furthermore, the present invention relates to a kit of parts comprising said composition and the use of said composition.