Combinations of Plant Essential Oils and Their Major Compositions Inducing Mortality and Morphological Abnormality of Aedes Aegypti and Aedes Albopictus

2021 ◽  
Author(s):  
Dr. Mayura Soonwera ◽  
Tanapoom Moungthipmalai ◽  
Jirapon Aungtikun ◽  
Dr. Sirawut Sittichok
Keyword(s):  
Aedes Aegypti ◽  
Essential Oils ◽  
Aedes Albopictus ◽  
Morphological Abnormality ◽  
Plant Essential Oils

scholarly journals Rapid Immobilization of Adult Aedes aegypti Caused By Plant Essential Oils At Sublethal Concentrations

2018 ◽  
Vol 34 (3) ◽  
pp. 210-216 ◽  
Author(s):  
Edmund J. Norris ◽  
Maria Archevald-Cansobre ◽  
Aaron D. Gross ◽  
Lyric C. Bartholomay ◽  
Joel R. Coats
Keyword(s):  
Aedes Aegypti ◽  
Essential Oils ◽  
Adult Female ◽  
Insect Pests ◽  
Plant Essential Oils ◽  
Knockdown Effect ◽  
Test Population ◽  
Insect Populations ◽  
Delayed Mortality ◽  
Sublethal Concentrations

ABSTRACT Many synthetic insecticides cause immobilization in insect pests after they are exposed. This immobilization or knockdown is an important feature of intoxication that contributes to the abatement of pest insect populations, while preventing vectors of disease from biting and spreading pathogenic organisms to susceptible individuals. We have previously demonstrated that certain plant essential oils rapidly immobilize adult female mosquitoes that have been exposed via topical application. To further characterize this effect, adult female Aedes aegypti were exposed to multiple concentrations of 32 commercially available plant essential oils, and immobilization at 1 h after exposure was recorded. The dose required to produce the 1-h knockdown effect in 50% of the test population (KD50) was calculated and compared with concentrations of each plant essential oil that caused mortality at 24 h. In the current study, multiple plant essential oils caused high percentage knockdown at 1 h at lower concentrations than concentrations that caused mortality at 24 h. Moreover, delayed mortality was observed in mosquitoes that were exposed to various concentrations of the 2 plant essential oils that produced significant knockdown at 1 h. These observations demonstrate an important characteristic of many plant essential oils and represent a novel means for which these oils may be incorporated into future insecticidal formulations.

scholarly journals Plant essential oils synergize various pyrethroid insecticides and antagonize malathion in Aedes aegypti

2019 ◽  
Vol 33 (4) ◽  
pp. 453-466 ◽  
Author(s):  
E. J. Norris ◽  
A. D. Gross ◽  
L. C. Bartholomay ◽  
J. R. Coats
Keyword(s):  
Aedes Aegypti ◽  
Essential Oils ◽  
Pyrethroid Insecticides ◽  
Plant Essential Oils

scholarly journals Co-Toxicity Factor Analysis Reveals Numerous Plant Essential Oils Are Synergists of Natural Pyrethrins against Aedes aegypti Mosquitoes

Insects ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 154
Author(s):  
Edmund J. Norris ◽  
Jeffrey R. Bloomquist
Keyword(s):  
Factor Analysis ◽  
Aedes Aegypti ◽  
Essential Oils ◽  
Pearson Correlation ◽  
Synergistic Activity ◽  
Female Adult ◽  
Plant Essential Oils ◽  
East Indies ◽  
Toxicity Factor ◽  
Control Technologies

With insecticide-resistant mosquito populations becoming an ever-growing concern, new vector control technologies are needed. With the lack of new chemical classes of insecticides to control mosquito populations, the development of novel synergists may improve the performance of available insecticides. We screened a set of 20 plant essential oils alone and in combination with natural pyrethrins against Aedes aegypti (Orlando) female adult mosquitoes to assess their ability to synergize this natural insecticide. A co-toxicity factor analysis was used to identify whether plant oils modulated the toxicity of natural pyrethrins antagonistically, additively, or synergistically. Both knockdown at 1 h and mortality at 24 h were monitored. A majority of oils increased the toxicity of natural pyrethrins, either via an additive or synergistic profile. Many oils produced synergism at 2 µg/insect, whereas others were synergistic only at the higher dose of 10 µg/insect. Amyris, cardamom, cedarwood, and nutmeg East Indies (E.I.) oils were the most active oils for increasing the mortality of natural pyrethrins at 24 h with co-toxicity factors greater than 50 at either or both doses. A number of oils also synergized the 1 h knockdown of natural pyrethrins. Of these, fir needle oil and cypress oils were the most successful at improving the speed-of-action of natural pyrethrins at both doses, with co-toxicity factors of 130 and 62, respectively. To further assess the co-toxicity factor method, we applied selected plant essential oils with variable doses of natural pyrethrins to calculate synergism ratios. Only the oils that produced synergistic co-toxicity factors produced statistically significant synergism ratios. This analysis demonstrated that the degree of co-toxicity factor correlated well with the degree of synergism ratio observed (Pearson correlation coefficient r = 0.94 at 2 µg/insect; r = 0.64 at 10 µg/insect) and that the co-toxicity factor is a useful tool in screening for synergistic activity.

scholarly journals Development of cellulose nanocrystal-stabilized Pickering emulsions of massoia and nutmeg essential oils for the control of Aedes albopictus

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Seon-Mi Seo ◽  
Jae-Woo Lee ◽  
Jonghyun Shin ◽  
Jun-Hyung Tak ◽  
Jinho Hyun ◽  
...  
Keyword(s):  
Essential Oils ◽  
Larvicidal Activity ◽  
Aedes Albopictus ◽  
Cellulose Nanocrystal ◽  
Asian Tiger Mosquito ◽  
Pickering Emulsions ◽  
Benzyl Benzoate ◽  
Plant Essential Oils ◽  
Asian Tiger ◽  
Larvicidal Activities

AbstractWe investigated the larvicidal potential of 10 plant essential oils (EOs) against the Asian tiger mosquito Aedes albopictus. Among the EOs, larvicidal activity against Ae. albopictus was strongest in those derived from massoia (Massoia aromatica) and nutmeg (Myristica fragrans). Larvicidal activities of massoia and nutmeg EOs against Ae. albopictus were 95.0% and 85.0% at 50 μg/mL, respectively. A total of 4 and 14 compounds were identified from massoia and nutmeg, respectively, and two massoia lactones, C10 and C12, were isolated from massoia EO. Among the identified compounds, benzyl salicylate, terpinolene, C12 massoia lactone, sabinene, benzyl benzoate, methyl eugenol, and C10 massoia lactone exhibited the strong larvicidal activity. Cellulose nanocrystal (CNC)-stabilized Pickering emulsions of massoia and nutmeg EOs were developed to overcome the insolubility of EOs in water. CNC/massoia and CNC/nutmeg emulsions were stable for at least 10 days, and larvicidal activities of CNC/massoia PE and CNC/nutmeg were higher than those of crude massoia and nutmeg EOs. This study presents a CNC-stabilized PE, a suitable formulation for EOs, as a potential larvicide against Ae. albopictus.

Repellency of Essential Oils of Cryptomeria japonica (Pinaceae) against Adults of the Mosquitoes Aedes aegypti and Aedes albopictus (Diptera:Culicidae)

2009 ◽  
Vol 57 (23) ◽  
pp. 11127-11133 ◽  
Author(s):  
Hui-Jing Gu ◽  
Sen-Sung Cheng ◽  
Chun-Ya Lin ◽  
Chin-Gi Huang ◽  
Wei-June Chen ◽  
...  
Keyword(s):  
Aedes Aegypti ◽  
Essential Oils ◽  
Aedes Albopictus ◽  
Cryptomeria Japonica

scholarly journals Improved adulticidal activity against Aedes aegypti (L.) and Aedes albopictus (Skuse) from synergy between Cinnamomum spp. essential oils

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jirapon Aungtikun ◽  
Mayura Soonwera
Keyword(s):  
Aedes Aegypti ◽  
Synergistic Effect ◽  
Essential Oils ◽  
Aedes Albopictus ◽  
Mosquito Species ◽  
Major Constituent ◽  
Mosquito Vectors ◽  
Insecticidal Efficacy ◽  
Susceptibility Tests ◽  
Synergistic Combinations

AbstractImproved natural adulticidal agents against mosquito vectors are in urgent need, and essential oils from Cinnamomum plants can assume this role quite readily. Cinnamomum verum, C. cassia, and C. loureiroi essential oils (EOs) were extracted from the barks and evaluated for their chemical composition by GC–MS. The major constituent of the three EOs was cinnamaldehyde. WHO susceptibility tests on individual and combined EOs as well as cinnamaldehyde were conducted against female adults of Aedes aegypti and Aedes albopictus. All EO combinations exhibited a synergistic effect, manifesting a higher toxicity, with a synergistic value ranging from 2.9 to 6.7. Their increasing mortality value was improved between 16.0 to 41.7%. The highest synergistic effect was achieved by an EO combination of 0.5% C. cassia + 0.5% C. loureiroi, while the highest insecticidal activity was achieved by 2.5% C. verum + 2.5% C. cassia and 1% cinnamaldehyde, with a knockdown and mortality rate of 100% and a KT50 between 0.7 and 2.1 min. This combination was more toxic to both mosquito species than 1% w/v cypermethrin. These findings demonstrate that cinnamaldehyde and synergistic combinations of C. verum + C. cassia EOs and C. cassia + C. loureiroi EOs have a high insecticidal efficacy against Aedes populations.

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