Lethal and sublethal effects of essential oil-loaded zein nanocapsules on a zoonotic disease vector mosquito, and their non-target impact

2022 ◽  
Vol 176 ◽  
pp. 114413
Author(s):  
Susana Sánchez-Gómez ◽  
Rafael Pagán ◽  
Roman Pavela ◽  
Eugenia Mazzara ◽  
Eleonora Spinozzi ◽  
...  
Keyword(s):  
Essential Oil ◽  
Sublethal Effects ◽  
Zoonotic Disease ◽  
Disease Vector ◽  
Vector Mosquito

scholarly journals Lethal and sublethal effects of essential oil of Lippia sidoides (Verbenaceae) and monoterpenes on Chagas’ disease vector Rhodnius prolixus

2016 ◽  
Vol 112 (1) ◽  
pp. 63-69 ◽  
Author(s):  
Marcela B Figueiredo ◽  
Geovany A Gomes ◽  
Jayme M Santangelo ◽  
Emerson G Pontes ◽  
Patricia Azambuja ◽  
...  
Keyword(s):  
Essential Oil ◽  
Chagas Disease ◽  
Sublethal Effects ◽  
Rhodnius Prolixus ◽  
Lippia Sidoides ◽  
Disease Vector

scholarly journals Inter-Population Similarities and Differences in Predation Efficiency of a Mosquito Natural Enemy

2020 ◽  
Vol 57 (6) ◽  
pp. 1983-1987
Author(s):  
Ross N Cuthbert ◽  
Tatenda Dalu ◽  
Ryan J Wasserman ◽  
Olaf L F Weyl ◽  
P William Froneman ◽  
...  
Keyword(s):  
Critical Factor ◽  
Population Variation ◽  
Temporary Pond ◽  
Feeding Time ◽  
Eastern Cape ◽  
Feeding Rates ◽  
Calanoid Copepods ◽  
Disease Vector ◽  
Vector Mosquito ◽  
Predation Efficiency

Abstract Predation is a critical factor that mediates population stability, community structure, and ecosystem function. Predatory natural enemies can contribute to the regulation of disease vector groups such as mosquitoes, particularly where they naturally co-occur across landscapes. However, we must understand inter-population variation in predatory efficiency if we are to enhance vector control. The present study thus employs a functional response (FR; resource use under different densities) approach to quantify and compare predatory interaction strengths among six populations of a predatory temporary pond specialist copepod, Lovenula raynerae, from the Eastern Cape of South Africa preying on second instar Culex pipiens complex mosquito larvae. All individuals from the sampled populations were predatory and drove significant mortality through per capita predation rates of 0.75–1.10 mosquitoes/h at maximum densities over a 5-h feeding time. Individuals from all copepod populations exhibited Type II FRs with no significant differences in attack rates. On the other hand, there were significant differences in handling times, and therefore also maximum feeding rates (maximum experimental prey density: 32), suggesting possible genetic differences among populations that influenced predation. Owing to a widespread distribution in arid landscapes, we propose that predatory calanoid copepods such as L. raynerae play a key regulatory role at the landscape scale in the control of disease vector mosquito populations. We propose that these ecosystems and their specialist biota should thus be conserved and enhanced (e.g., via selective breeding) owing to the ecosystem services they provide in the context of public health.

scholarly journals Encapsulation of Carlina acaulis essential oil and carlina oxide to develop long-lasting mosquito larvicides: microemulsions versus nanoemulsions

2021 ◽  
Author(s):  
Roman Pavela ◽  
Lucia Pavoni ◽  
Giulia Bonacucina ◽  
Marco Cespi ◽  
Loredana Cappellacci ◽  
...  
Keyword(s):  
Essential Oil ◽  
Larvicidal Activity ◽  
Wistar Rats ◽  
Water Solubility ◽  
Sublethal Effects ◽  
Uv Light ◽  
Human Keratinocytes ◽  
Mosquito Larvae ◽  
Mosquito Larvicides ◽  
Root Essential Oil

AbstractCarlina acaulis root essential oil (EO) is one of the most potent mosquito larvicides (LC50 < 2 ppm). This EO is mainly composed of carlina oxide (> 90%). Poor water solubility and rapid degradation from UV light and oxygen in the environment limit the real-world use of this EO. Herein, we developed nanocarrier-based formulations, namely micro- and nanoemulsions (ME and NE, respectively) containing C. acaulis EO or carlina oxide (both at 0.5%) as active ingredients (a.i.). The larvicidal activity of ME and NE was evaluated against Culex quinquefasciatus. The highest larvicidal activity was achieved by the ME containing 0.5% of the EO (M1); its LC50(90) was 579.1 (791.3) µL L−1. Sublethal effects of this ME and its a.i. were assessed testing both at the LC16, LC30, LC50 and LC90 on mosquito larvae exposed to each product for 1–7 h, and then monitoring mortality for 18 days. At variance with the EO, ME application, even at LC16, led to 100% mortality at 18 days. The EO and its encapsulated form were scarcely toxic to human keratinocytes (HaCaT) and human fibroblast (NHF A12) cell lines. The acute toxicity of C. acaulis EO and its ME (M1) was also evaluated in Wistar rats through oral administration; EO LD50 was 1098 mg kg−1 bw, whereas its ME, even at 5000 mg kg−1 bw (considered the upper testing limit to establish safety to mammals), was not toxic. This study highlights the outstanding efficacy of C. acaulis EO ME for developing long-lasting and safe larvicides against Cx. quinquefasciatus.

Chemical Composition and Larvicidal Activity of Rosmarinus officinalis Essential Oil Against West Nile Vector Mosquito Culex pipiens (L.)

2020 ◽  
Vol 23 (6) ◽  
pp. 1463-1474
Author(s):  
Fouad Zeghib ◽  
Fouzia Tine-Djebbar ◽  
Assia Zeghib ◽  
Khaldoun Bachari ◽  
Karima Sifi ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Essential Oil ◽  
Larvicidal Activity ◽  
Culex Pipiens ◽  
Rosmarinus Officinalis ◽  
West Nile ◽  
Vector Mosquito

scholarly journals Chemical characterization; Antimicrobial and Larvicidal activity of essential oil from Callistemon citrinus (Bottle brush) leaves

2021 ◽  
Author(s):  
D. P. Chachad ◽  
A. Dias ◽  
K. Uniyal ◽  
U. Varma ◽  
P. Jadhav ◽  
...  
Keyword(s):  
Essential Oil ◽  
Microbial Activity ◽  
Larvicidal Activity ◽  
Mosquito Control ◽  
Chemical Characterization ◽  
Global Scale ◽  
Vector Mosquito ◽  
Bacteria And Fungi ◽  
Bottle Brush ◽  
Harmful Effects

AbstractMosquito-borne diseases are prevalent in more than 100 countries across the world. They are the major vectors for transmission of Malaria, dengue, yellow fever, filariasis, schistosomiasis, Japanese encephalitis etc. Many of the formerly employed insecticides in mosquito control have harmful effects on human health and other non-target populations, their non-biodegradable nature, the higher rate of bio-magnification in our ecosystem and increasing insecticide resistance on global scale are raising serious concerns. . Therefore, search for natural, eco-friendly alternatives such as bio-insecticides is imperative. In this study, Larvicidal activity of the essential oil obtained from the leaves of Callistemon citrinus was tested on Dengue vector mosquito Aedes aegypti & Chikungunya vector mosquito Culex sp. Also, the chemical composition of the essential oil was recorded using GC-MS analysis. The anti-microbial activity of the essential oil was checked against a few common bacteria and fungi. Callistemon citrinus comes out to be one of such bio-insecticides with many therapeutic active constituents, showing appreciable anti-microbial activity and 80-100% larvicidal activity.

scholarly journals Screening and evaluation of different algal extracts and prospects for control the disease vector mosquito Culex pipiens L

2021 ◽  
Author(s):  
Doaa R. Abdel Haleem ◽  
Neamat H. El Tablawy ◽  
Lamya Ahmed Alkeridis ◽  
Samy Sayed ◽  
Ahmed M. Saad ◽  
...  
Keyword(s):  
Culex Pipiens ◽  
Disease Vector ◽  
Vector Mosquito ◽  
Algal Extracts
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