scholarly journals The effects of plant essential oils on escape response and mortality rate of Aedes aegypti and Anopheles minimus

2015 ◽  
Vol 40 (2) ◽  
pp. 318-326 ◽  
Author(s):  
Sunaiyana Sathantriphop ◽  
Nicole L. Achee ◽  
Unchalee Sanguanpong ◽  
Theeraphap Chareonviriyaphap
Keyword(s):  
Mortality Rate ◽  
Aedes Aegypti ◽  
Essential Oils ◽  
Escape Response ◽  
Plant Essential Oils ◽  
Anopheles Minimus

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.

Insecticidal Effect of Essential Oils against Fall Webworm (Hypantria cunea Drury (Lepidoptera: Arctiidae))

2017 ◽  
Vol 12 (10) ◽  
pp. 1934578X1701201 ◽  
Author(s):  
Temel Gokturk ◽  
Saban Kordali ◽  
Ayse Usanmaz Bozhuyuk
Keyword(s):  
Mortality Rate ◽  
Essential Oils ◽  
Dose Effect ◽  
Hyphantria Cunea ◽  
Plant Essential Oils ◽  
Insecticidal Effect ◽  
Achillea Biebersteinii ◽  
Fall Webworm ◽  
Rosmarinus Officinalis L ◽  
Toxic Plant

In this study, insecticidal effects of the essential oils obtained from plants Achillea biebersteinii Afan., Origanum onites L., Rosmarinus officinalis L., Salvia pratensis L., Satureja hortensis L., Tanacetum balsamita L. on American White Butterfly [ Hyphantria cunea Drury, Lepidoptera: Arctiidae] were tested in laboratory conditions. In this context, larvae of the 3rd and 4th periods of H. cunea were exposed to essential oils at doses of 10, 15 and 20 μl/petri for 24, 48, 72 and 96 hours. All of the essential oils used in the study caused mortality at different rates; the highest effect was obtained with the essential oil from O.onites with a mortality rate of 87.7%. The oils from R. officinalis (74.4%), A biebersteinii. (74.4%), S. hortensis (68.8%), T. balsamita (34.4%), and S. pratensis (30.0%) followed this in this order. As a results of the dose effect tests conducted in the second part of the study, it was determined that T. balsamita (LD50=7.1 ppm) and O. onites (LD90=23.2 ppm) were the most toxic plant essential oils when lethal concentration values (LD50 and LD90) were considered. It was found that the essential oils of R. officinalis (LD50 = 86.1 ppm) and S. hortensis (LD90=62722.1 ppm) have the lowest toxic effect. The results obtained show that the essential oils from A. biebersteinii, O. onites, and R. officinalis can be used in the fight against H. cunea.

Sign in / Sign up

Export Citation Format

Share Document