scholarly journals Phytotoxic effects of essential oils in controlling weed species Digitaria horizontalis and Cenchrus echinatus

2017 ◽  
Vol 12 ◽  
pp. 59-65 ◽  
Author(s):  
Marcio Akio Ootani ◽  
Marcelo Rodrigues dos Reis ◽  
Alex Sander Rodrigues Cangussu ◽  
Aristoteles Capone ◽  
Rodrigo Ribeiro Fidelis ◽  
...  
Keyword(s):  
Essential Oils ◽  
Weed Species ◽  
Phytotoxic Effects

Phytotoxic effects of several essential oils on two weed species and Tomato

2018 ◽  
Vol 13 ◽  
pp. 204-212 ◽  
Author(s):  
Hossein Hazrati ◽  
Mohammad Jamal Saharkhiz ◽  
Mahmoodreza Moein ◽  
Hassan Khoshghalb
Keyword(s):  
Essential Oils ◽  
Weed Species ◽  
Phytotoxic Effects

scholarly journals Phytotoxic effects of essential oils from Nepeta glocephalata Rech.f. and N. ispahanica Boiss. on se-lected weed species

2021 ◽  
Vol 117 (4) ◽  
pp. 1
Author(s):  
Marjan DYANAT ◽  
Farzad ASGARI
Keyword(s):  
Essential Oils ◽  
Foliar Application ◽  
Chenopodium Album ◽  
Dry Mass ◽  
Amaranthus Retroflexus ◽  
Weed Species ◽  
Visible Injury ◽  
Phytotoxic Effects ◽  
Root And Shoot Length ◽  
Canary Grass

<p class="042abstractstekst">In the present study the bioherbicidal activity of essential oils hydrodistilled from <em>Nepeta glocephalata </em>Rech.f and <em>N</em>. <em>ispahanica</em> Boiss were investigated on four weed species (barnyard grass (<em>Echinochloa crus-galli</em> (L.) Beauv), redroot pigweed (<em>Amaranthus retroflexus </em>L.), lambsquarters (<em>Chenopodium album </em>L.) and canary grass (<em>Phalaris canariensis </em>L.)). A total of 37 components were identified from the essential oils of <em>N. glocephalata and N. ispahanica</em> constituting approximately 98.61 % and 96.1 % of the oils, respectively. In laboratory bioassay different concentrations (0, 1, 2, 4 and 8 μl ml<sup>-1</sup>) of two <em>Nepeta </em>essential oils on germination, root and shoot length were studied. Results showed by increasing the concentration of oils, all studied traits of the weeds were decreased compared with control. In a glass house bioassay post-emergence application of <em>Nepeta</em> essential oils (1.25 %, 2.5 %, 5 % and 10 %, v/v) on 3-week-old weed plants caused visible injury (7-days after spray) ranging from chlorosis to necrosis of plant weeds. In foliar application under glasshouse conditions, both<em> Nepeta</em> essential oils reduced the seedling dry mass and concentrations of chlorophyll a chlorophyll b. The study concludes that <em>Nepeta</em> essential oils have phytotoxic effects and could be used as bioherbicides but the selectivity of these compounds should be considered also.</p>

scholarly journals Bio-Herbicidal Effects of Oregano and Rosemary Essential Oils on Chamomile (Matricaria chamomilla L.) Crop in Organic Farming System

Agronomy ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 475 ◽  
Author(s):  
Frabboni ◽  
Tarantino ◽  
Petruzzi ◽  
Disciglio
Keyword(s):  
Essential Oils ◽  
Weed Control ◽  
Weed Management ◽  
Farming System ◽  
Point Of View ◽  
Matricaria Chamomilla ◽  
Weed Species ◽  
Organic System ◽  
Economic Point ◽  
Natural Herbicides

Chamomile (Matricaria chamomilla L.) is a well-known medicinal plant species in which the products requested from the market are those that are derived from the organic system. The study was conducted to assess the allelopathic effects, as natural herbicides, of two essential oils extracted from oregano (Origanum vulgare L.) and rosemary (Rosmarimum officinalis L.), with the objective of exploring the possibility of their utilization for future weed management. A field experiment was conducted over two seasons, when the infestation of 15 different weed species was detected. Each essential oil was applied at two different concentrations (50% diluted and undiluted), three times during the chamomile crop under an organic farm system. The results demonstrated that the germination of different weed species was affected differently by the type of essential oils and especially by their concentrations. The undiluted oils inhibited most of the germination of several weed species, highlighting a significantly higher percentage of Weed Control Efficiency (WCE) and suggesting the potential to be used as bio-herbicides. Bioherbicidal weed control methods could offer an advantage with respect to hand weeding, particularly from an economic point of view.

scholarly journals Bio-Herbicidal Potential of the Essential Oils from Different Rosmarinus officinalis L. Chemotypes in Laboratory Assays

Agronomy ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 775
Author(s):  
Jihane El Mahdi ◽  
Waed Tarraf ◽  
Claudia Ruta ◽  
Lea Piscitelli ◽  
Adel Aly ◽  
...  
Keyword(s):  
Essential Oils ◽  
Amaranthus Retroflexus ◽  
Rosmarinus Officinalis ◽  
Allelopathic Effect ◽  
Dependent Manner ◽  
Weed Species ◽  
Potent Effect ◽  
Rosmarinus Officinalis L ◽  
Monoterpene Composition

The current study aimed to assess the allelopathic effect of Rosmarinus officinalis L. essential oils (EOs) to define the potent effect against weed species, by exploring distinct chemotypes and their main compounds. The EOs from eight accessions were characterized. Their components were identified by gas chromatography, and four chemotypes were defined; C1 (α-pinene), C2 (camphor), C3 (α-pinene/1,8-cineole), and C4 (α-pinene/1,8-cineole/camphor). Four concentrations of the EOs (400, 800, 1200, and 2400 μL/L) and the main compounds of each chemotype were tested in a laboratory assay against Amaranthus retroflexus L. and Lolium perenne L. in pre- and post-germination. The results showed that the EOs significantly affected all the tested parameters (germination, early growth, and physiological and histological parameters of the weeds under study) in a dose, chemotype, and species dependent manner. A. retroflexus was more sensitive than L. perenne at germination level being significantly inhibited at the lowest dose of all the chemotypes. The latter all exhibited significant effects but with a higher potency of C2 (camphor chemotype) and C3 (α-pinene/1,8-cineole chemotype), as well qualitative differences in the induced damage. Our results thus increase knowledge about the role of the monoterpene composition in bio-herbicidal effect, which can help in the development of EO based bio-herbicides.

scholarly journals Phytotoxic Effects of Commercial Eucalyptus citriodora, Lavandula angustifolia, and Pinus sylvestris Essential Oils on Weeds, Crops, and Invasive Species

Molecules ◽  
2019 ◽  
Vol 24 (15) ◽  
pp. 2847 ◽  
Author(s):  
Ibáñez ◽  
Blázquez
Keyword(s):  
Invasive Species ◽  
Seed Germination ◽  
Essential Oil ◽  
Pinus Sylvestris ◽  
Essential Oils ◽  
In Vitro Assays ◽  
Eucalyptus Citriodora ◽  
Nicotiana Glauca ◽  
Lavandula Angustifolia ◽  
Phytotoxic Effects

Background: essential oils are well known for their pharmacological effectiveness as well as their repellent, insecticide, and herbicide activities. The emergence of resistant weeds, due to the overuse of synthetic herbicides, makes it necessary to find natural alternatives for weed control. The aim of this study was to evaluate the phytotoxic effects of Eucalyptus citriodora, Lavandula angustifolia, and Pinus sylvestris, three common commercial essential oils, on weeds (Portulaca oleracea, Lolium multiflorum, and Echinochloa crus-galli), food crops (tomato and cucumber), and the invasive species Nicotiana glauca. Methods: to determine herbicidal effects, essential oils were tested at different concentrations (0.125–1µL/mL). The index of germination and seedling length data were recorded over 14 days. Results: the in vitro assays showed that L. angustifolia with linalool (38.7 ± 0.1%), 1,8-cineole (26.5 ± 0.1%), and camphor (14.2 ± 0.1%) as the main compounds showed the most phytotoxic effects affecting seed germination in weeds and tomato, and the aforementioned invasive species. L. multiflorum was the most sensitive weed, particularly to lavender essential oil, which decreased the growth of its hypocotyl and radicle by 87.8% and 76.7%, respectively, at a dose of 1 µL/mL. Cucumber was the most resistant food crop, with no significant reduction observed in seed germination and hypocotyl growth with E. citriodora and L. angustifolia essential oils. Conclusions: lavender essential oil represents a promising candidate for the development of effective and safe herbicides in the management of L. multiflorum affecting cucumber crops.

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