Wireworms in sugar beet and corn are suppressed by sowing insecticide treated seeds, which provides satisfacory protection in low infection conditions. Until now, insecticides from the neonicotinoid group have been used to treat the seeds, but due to known problems related to the negative impact on bees, since 2018. their use has been prohibited for this purpose. Therefore, it is extremely important to determine the efficacy of other active substances that could serve as an adequate substititution for neonicotinoides. The aim of thesis was to investigate the effectiveness of insecticides containing active substances chlorantraniliprole, spinosad and azadirachtin on wireworms by seed treatment and evaluate their use as a replacement for neonicotioid insecticides. Sugar beet and corn seeds were treated with insecticides in three doses and sown in jars. After 10 days, wireworms were placed in the jars, live and dead individuals were read. Among all ecologically acceptable insecticides, chlorantraniliprole achieved the best efficacy on sugar beet, while azadirachtin was less effective but still gave satisfactory results in the range of standard insecticide efficacy. The active substance spinosad did not show a satisfactory effect. In the experiment with wireworms on corn, spinosad achieved the highest efficacy, while chlorantraniliprole and azadirachtin did not show satisfactory effect. Explored active substances are good candidates for replacement of neonicotinoid insecitides, but it is necessary to conduct more researches in order to introduce them as successful substances in pest control and to bring them in everyday use.