Tursun, NihatIşıkber, AliAlma, M.HakkiBozhuyuk, Ayse Usanmaz2025-10-242025-10-2420222458-8377https://doi.org/10.15316/SJAFS.2022.036https://search.trdizin.gov.tr/tr/yayin/detay/1128382https://hdl.handle.net/20.500.12899/2232He essential oils from oregano (Origanum syriacum L.) and laurel (Laurus no- bilis L.), and their main components, namely, carvacrol, 1,8-cineole and ?- pinene, were tested to determine their inhibitory effects on the seed germinations of three different weeds [redroot amaranth (Amaranthus retroflexus L.), wild licorice (Glycyrrhiza glabra L.), curled dock (Rumex crispus L.) and cutleaf ground-cherry (Physalis angulata L.)] and three crops [(wheat (Triticum aes- tivum L.), corn (Zea mays L.) and cotton (Gossypium hirsitum L.)]. Gas chro- matography/mass spectroscopy (GC-MS) analysis showed that 1,8-cineole and carvacrol were the major components of laurel and oregano essential oils, re- spectively. An in-vitro bioassay seed germination test showed that oregano es- sential oil and carvacrol completely inhibited the germination of weeds at all the concentrations ranging from 1 to 5 ?l/Petri dish, while seed germination of test weeds significantly decreased with increasing of the concentrations of laurel es- sential oil and its main components, 1,8-cineol and ?-pinene ranging from 5 to 20 ?l/Petri dish. Oregano essential oil and carvacrol were totally ineffective on cotton and corn germination (except for the concentration of 5 ?l/Petri dish of cavracrol), whereas they had a strong inhibitory activity against wheat seeds. On the other hand, the laurel essential oil and its main component, 1,8-cineole, showed less selective action on test crop species. It could be concluded that vol- atile oil from O. syriacum and its main component, cavracrol, possessed a strong inhibitory effect on germination of the weeds and was totally selective action on some crops, and could be utilized as bioherbicide for future weed management programmes.eninfo:eu-repo/semantics/openAccessBahçe BitkileriZiraat MühendisliğiBitki BilimleriBiyoloji Çeşitliliğinin KorunmasıArticle10.15316/SJAFS.2022.0363622752811128382