Insecticidal and acetylcholine esterase inhibition activity of <i>Rhododendron thymifolium</i> essential oil and its main constituent against two stored product insects

Liang, Junyu; Yang, Yingying; An, Yue; Shao, Ya-Zhou; He, Chun‐Xia; Zhang, Ji; Lee, Jia

doi:10.1080/03601234.2021.1894888

Cited by 14 publications

(7 citation statements)

References 21 publications

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“…Most of the chemical constituents detected in R. przewalskii EO reported in this paper were consistent with the previous studies (Bai et al 2019 ). Compared with the other Rhododendron plants, these two EOs were also found rich in terpenoids, while the types and contents of terpenoids were different; for example, the content of β-Elemenone was 0.84% in the specie of R. Rufum in this experiment, whereas β-Elemenone (35.17%) had a high content in the specie of R. thymifoliu (Liang et al 2021a , b ). Spathulenol (14.4%), one of the main components isolated in the EO of R. albiflorum leaves, is only 0.71% in the species of R. przewalskii (Schepetkin et al 2021 ).…”

Section: Discussionmentioning

confidence: 67%

“…In view of the above situations, a series of measures have been taken to prevent pest risks. The most commonly used method is the application of synthetic chemicals (Liang et al 2021a , b ). For example, phosphine fumigants and pyrethroids contact insecticides have been widely used for controlling insects in stored products worldwide (Nayak et al 2020 ; Campolo et al 2018 ).…”

Section: Introductionmentioning

confidence: 99%

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Investigation of insecticidal activity of two Rhododendron species on stored-product insects

et al. 2022

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This study was designed to investigate the insecticidal activity of the essential oils (EOs) and extracts from Rhododendron rufum and Rhododendron przewalskii . The EOs were extracted from the leaves of R. Rufum and R. przewalskii by hydro-distillation and their chemical components were analyzed by gas chromatography–mass spectrometry (GC–MS). The repellency, contact toxicity and antifeedant activity of the EOs and extracts were evaluated against Sitophilus oryzae and Tribolium castaneum along with those of their main components. A total of nine compounds were identified from the EO of R. Rufum , and the most abundant component was myristicin (79.72%). The EO of R. Rufum exhibited repellent activities at different levels and its main compound myristicin showed contact toxicity and repellent effects against S. oryzae and T. castaneum . Meanwhile, by bioassay-guided fractionation, four compounds with strong antifeedant activities against T. castaneum , 24-methylenecycloartanyl-2'E, 4'Z-tetradecadienoate (1), methyl thyrsiflorin B acetate (2), friedelin (3) and Excoecarin R1 methyl ester (4) were separated and identified from the ethanol extract of R. przewalskii for the first time. Considering the significant anti-insect activities, the EOs and extracts of R. Rufum and R. przewalskii might be used in integrated pest strategies, establishing a good perspective for the comprehensive use of natural plant resources of Rhododendron genus.

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Section: Discussionmentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Investigation of insecticidal activity of two Rhododendron species on stored-product insects

et al. 2022

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“…Furthermore, multiple biochemical effects of pure essential oils have been reported, including inhibition of acetylcholinesterase (AChE), blockage of the octopamine and gamma-aminobutyric acid receptors (GABArs), and reduction in detoxifying enzyme (esterase and glutathione S -transferases (GSTs)) activities and energy resources against insect pests [ 62 , 63 , 64 ]. Another characteristic of pure essential oils, besides high insecticidal efficiency against a wide range of insect pests, is low mammalian toxicity [ 62 , 63 ]. Furthermore, their components, in general, are biodegradable, in contrast to their ecotoxicology [ 10 , 65 ].…”

Section: Discussionmentioning

confidence: 99%

Encapsulation of Eucalyptus largiflorens Essential Oil by Mesoporous Silicates for Effective Control of the Cowpea Weevil, Callosobruchus maculatus (Fabricius) (Coleoptera: Chrysomelidae)

et al. 2022

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Although the use of synthetic chemicals is the principal method for insect pest management, their widespread application has led to numerous side effects, including environmental pollution and threats to human and animal health. Plant essential oils have been introduced as promising natural substitutes for synthetic insecticides. However, high volatility and/or low durability are the main limiting factors for essential oil application for control of insect pests. Accordingly, along with an evaluation of the fumigant toxicity of Eucalyptus largiflorens essential oil against the cowpea weevil, Callosobruchus maculatus, essential oil was nanoencapsulated by two mesoporous silicates, MCM-41 and zeolite 3A, to enhance fumigant persistence and toxicity. The chemical profile of essential oil was also analyzed through gas chromatographic-mass spectrometry. E. largiflorens essential oil showed significant concentration-dependent toxicity against insect pests; a concentration of 5.16 μL/L resulted in 100% mortality after 48 h. The toxicity of essential oil could be attributed to the presence of various insecticidal terpenes, such as spathulenol (15.6%), cryptone (7.0%), and 1,8-cineole (5.8%). Fumigant persistence was increased from 6 days to 19 and 17 days for pure and capsulated essential oil with MCM-41 and Zeolite 3A, respectively. The insect mortality also increased from 99 insects in pure essential oil to 178 and 180 insects in MCM-41 and Zeolite 3A encapsulated formulations, respectively. Therefore, the encapsulation of E. largiflorens essential oil by MCM- 41 and Zeolite 3A is a beneficial method for enhancing its persistence and toxicity against C. maculatus.

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“…Liang et al found that the essential oil of Rhododendron thymifolium can kills adults of Tribolium castaneum. In addition, the extract of R. thymifolium strongly inhibits acetylcholinesterase [169] . Ahn et al showed that the contact and fumigation effects of compound botanical pesticides on adults increased over time.…”

Section: Contact Toxicitymentioning

confidence: 97%

Quantitative Study on Anti-Pest Activity of Natural Products Based on Visualization Framework of Knowledge Graph

2023

Front. Agr. Sci. Eng.

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Insecticidal and acetylcholine esterase inhibition activity of Rhododendron thymifolium essential oil and its main constituent against two stored product insects

Cited by 14 publications

References 21 publications

Investigation of insecticidal activity of two Rhododendron species on stored-product insects

Investigation of insecticidal activity of two Rhododendron species on stored-product insects

Encapsulation of Eucalyptus largiflorens Essential Oil by Mesoporous Silicates for Effective Control of the Cowpea Weevil, Callosobruchus maculatus (Fabricius) (Coleoptera: Chrysomelidae)

Quantitative Study on Anti-Pest Activity of Natural Products Based on Visualization Framework of Knowledge Graph

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