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This undergraduate thesis studies the presence of entomological enemies at a certified biological (organic) cultivation of Cannabis sativa L. in the Prefecture of Thessaloniki. Visits on the spot were conducted in different time lapses, in order to collect insects that affect the cultivation. The samples were transferred to the Entomology Laboratory of International Hellenic University, where was held morphological identification of the insects, with the assistance of the material and technical infrastructure of the Laboratory. For the identification of the species were used the identification keys of Sharif et al., Maistrello et al., Chandra et al., Robertson, Ghahari and Moulet, Mata et al., Dietreich, Graham, Rider. The main insects that were found to be fed on a cultivation of Cannabis sativa L. in the Prefecture of Thessaloniki are the Hemiptera: Halyomorpha halys Stal, Pyrrhocoris apterus L., Dolycoris baccarum L., and species of the Cicadellidae family.