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Summary Biological control methods are considered as a priority and one of the most important elements of integrated plant protection, both in greenhouse grown and field crops. Tetranychus urticae and T. cinnabarinus are the most important pests occurring in greenhouse crops and successful control of these pests is very difficult. The present study determined the effectiveness of the composition of hemp oil in reducing the number of selected species of spider mites. The experiments in the laboratory revealed high efficacy in reducing of oil hemp in reducing T. urticae population – 82% mortality of larvae and 91% mortality of adult mites. Lower effectiveness was recorded in reducing the number of T. cinnabarinus – 75% mortality of larvae and 87% mortality of adult mites. The composition of the hemp oil was used at concentrations from 0.1 to 0.5%, and the highest efficiency was observed at highest concentration. Hemp oil was ineffective in control of eggs of the two species included in the experiment. Nevertheless, the results are very promising and might be an important element in the development of integrated protection programs for vegetables and ornamental plants grown in greenhouses

Possibilities of the use of composition of the extract of hemp to reduce the number of spider mites (Tetranychidae)