The present invention relates to plant-protecting active ingredient mixtures comprising fipronil and clothianidin having synergistically enhanced insecticical action by applying said mixtures to the plants or to the locus thereof and to a method for the protection of seeds comprising contacting the seeds before sowing and/or after pregermination with the aforementioned mixture. The invention also relates to seed comprising the aforementioned mixture and to the use of the aforementioned mixture for the protection of seeds from soil pests.
