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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.
The purpose of the study was to determine the effect of treating carrot seeds with aqueous extract from hemp on their health and germination. Carrot seeds of cv. Berlikumer 2 and Nantejska were soaked for 30 minutes in solutions of aqueous extract from hemp at concentrations of 3, 5, 10 and 20%. Untreated seeds, seeds soaked in distilled water and treated with Super Homai 70 DS constituted control treatments. The aqueous extract from hemp at none of applied concentrations controlled the incidence of Alternaria alternata and A. dauci compared with untreated seeds and seeds soaked in water. Treating seeds of cv. Berlikumer 2 with solution at concentration of 10% and seeds of cv. Nantejska with solutions at concentrations of 3, 5 and 10% decreased their infestation with A. radicina compared with the control. Super Homai 70 DS was the most effective. Application of the extract at concentrations of 3 and 5% improved seed germination capacity and decreased the number of diseased seedlings in both cultivars compared with untreated seeds and seeds soaked in water. Treating seeds with Super Homai 70 DS improved their germination to the highest degree.
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