Herbicidal value of essential oils from oregano-like flavour species

Abstract

Chemical composition and phytotoxicity of oregano, marjoram and Thymus mastichina essential oils against Portulaca oleracea L., Lolium multiflorum Lam. and Echinochloa crus-galli (L.) Beauv. has been investigated. Seventy-seven compounds reaching 97.3% and 99.4% were identified by gas chromatography-mass spectrometry. Carvacrol (60.42 ± 0.07%), p-cymene (15.52 ± 0.02%) and γterpinene (5.19 ± 0.02%) were the main compounds in oregano essential oil, whereas large amounts of 1,8-cineol (59.59 ± 0.85%, 49.49 ± 0.37%), linalool (13.05 ± 0.04%, 5.66 ± 0.01%) and αterpineol (3.36 ± 0.10%, 5.59 ± 0.01%), followed by β-pinene (4.35 ± 0.39, 5.54 ± 0.01%) and α-pinene (4.11 ± 0.53, 4.28 ± 0.01%) were found, respectively, in marjoram and T. mastichina essential oils. Oregano essential oil completely inhibited seed germination and seedling growth at all concentrations assayed (0.125-1 µL mL −1 ), whereas marjoram and T. mastichina essential oils only showed significant effects in hypocotyl and/or hypocotyl + radicle length depending on the weed and dose. ARTICLE HISTORY

New Tricks for Old Guys: Recent Developments in the Chemistry, Biochemistry, Applications and Exploitation of Selected Species from the Lamiaceae Family

“…in the work of Ibáñez and Blázquez. [206] Their results show that Oregano essential oil completely inhibited seed germination and seedling growth at all concentrations assayed, whereas marjoram and T. mastichina essential oils only showed significant effects in hypocotyl and/or hypocotyl + radicle length depending on the weed and dose. Among other EOs, O. vulgare L. was experimented for their herbicidal activity against Sinapis arvensis weed at different concentration then compared with commercial herbicides.…”

“…and Echinochloa crus‐galli (L.) P. Beauv . in the work of Ibáñez and Blázquez . Their results show that Oregano essential oil completely inhibited seed germination and seedling growth at all concentrations assayed, whereas marjoram and T. mastichina essential oils only showed significant effects in hypocotyl and/or hypocotyl+radicle length depending on the weed and dose.…”

Control of Erigeron bonariensis with Thymbra capitata, Mentha piperita, Eucalyptus camaldulensis, and Santolina chamaecyparissus Essential Oils

“…Our sample was carvacrol-type, characterized by high contents of this compound and also by the presence of p-cymene and γ-terpinene in different quantities [32][33][34]. The herbicidal activity of EOs rich in carvacrol from T. capitata and other species, as well as of the single compound has been largely studied, although the majority of experiments were performed in in vitro conditions [30,[35][36][37][38]. Seeds of Sinapis arvensis soaked for 30 min in a solution of 1.5 µL/mL T. capitata EO (83.86% carvacrol), dissolved in Tween 20 (0.1%), and then placed on double-layered moistened Whatman No.…”

Herbicidal potential of lavender (Lavandula angustifolia Mill.) essential oil components on bristly foxtail (Setaria verticillata (L.) P. Beauv.): Comparison with carvacrol, carvone, thymol and eugenol

“…The essential oils of some aromatic plants exhibit contact and fumigant insecticidal, bactericidal and fungicidal actions [1][2]. Additionally, phenolic and terpenic components of essential oils have been reported by several researchers as inhibitors of vegetation and growth [3][4][5][6][7][8][9][10][11][12]. In the course of evaluation of lemonscented gum (Eucalyptus citriodora Hook.…”

“…Further, it was established that the essential oil of English lavender and French lavender (Lavandula stoechas L.) were phytotoxic to redroot pigweed and common purslane [9]. Oregano (Origanum vulgare L.) essential oil can also contribute significantly to the vegetation and growth of the weeds common purslane, barnyardgrass and annual ryegrass [10]. Also, it was determined that oregano, sweet marjoram (Origanum majorana L.), lemon basil (Ocimum citriodorum L.) and clove [Syzygium aromaticum (L.) Merr.…”