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Kim DY, Hii J, Chareonviriyaphap T. Transfluthrin and Metofluthrin as Effective Repellents against Pyrethroid-Susceptible and Pyrethroid-Resistant Aedes aegypti (L.) (Diptera: Culicidae). INSECTS 2023; 14:767. [PMID: 37754735 PMCID: PMC10531799 DOI: 10.3390/insects14090767] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Revised: 08/31/2023] [Accepted: 09/11/2023] [Indexed: 09/28/2023]
Abstract
Aedes aegypti is a major vector of dengue fever in tropical regions. Spatial repellents (SRs) have shown promise in delaying pesticide resistance. Methods for discriminating concentrations (DCs) are well established using various bioassay tools, while data for high-throughput screening system (HITSS) toxicity bioassay (TOX) are absent. In this study, we compared and optimized lethal (LCs) and sub-lethal concentrations (SLCs) of transfluthrin (TFT) and metofluthrin (MFT) on pyrethroid-susceptible (USDA) and pyrethroid-resistant (Pu-Teuy) Ae. aegypti (L.) strains, using the HITSS-TOX. Mean mortality (MT) was 100% at LC99 and DC, compared to LC50 (45.0 ± 3.7%) and LC75 (65.8 ± 7.0%) for the USDA strain. However, the resistant strain (Pu-Teuy) showed reduced susceptibility against TFT and a significantly lower MT at LC50 (12.5 ± 4.4%; t = 5.665, df = 10, p < 0.001), LC75 (9.2 ± 3.5%; t = 4.844, df = 10, p = 0.001), LC99 (55.0 ± 9.9%; t = 4.538, df = 5, p = 0.006), and DC (75.0 ± 5.2%; U = 3.0, p = 0.007). The DC of TFT (0.15222%) was 4.7-fold higher than for MFT (0.03242%) in USDA strain. The baseline DCs established are useful to better understand susceptibility and the efficacy of various repellents against field populations of Ae. aegypti.
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Affiliation(s)
- Dae-Yun Kim
- Department of Entomology, Faculty of Agriculture, Kasetsart University, Bangkok 10900, Thailand;
| | - Jeffrey Hii
- College of Public Health, Medical & Veterinary Sciences, James Cook University, Brisbane, QLD 4000, Australia;
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Rodríguez-Rojas JJ, Arque-Chunga W, Fernández-Salas I, Rebollar-Téllez EA. Comparative Field Evaluation of Different Traps for Collecting Adult Phlebotomine Sand Flies (Diptera: Psychodidae) in an Endemic Area of Cutaneous Leishmaniasis in Quintana Roo, Mexico. JOURNAL OF THE AMERICAN MOSQUITO CONTROL ASSOCIATION 2016; 32:103-116. [PMID: 27280348 DOI: 10.2987/moco-32-02-103-116.1] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Phlebotominae are the vectors of Leishmania parasites. It is important to have available surveillance and collection methods for the sand fly vectors. The objectives of the present study were to evaluate and compare traps for the collection of sand fly species and to analyze trap catches along months and transects. Field evaluations over a year were conducted in an endemic area of leishmaniasis in the state of Quintana Roo, Mexico. A randomized-block design was implemented in study area with tropical rainforest vegetation. The study design utilized 4 transects with 11 trap types: 1) Centers for Disease Control and Prevention (CDC) light trap with incandescent bulb (CDC-I), 2) CDC light trap with blue light-emitting diodes (LEDs) (CDC-B), 3) CDC light trap with white LEDs (CDC-W), 4) CDC light trap with red LEDs (CDC-R), 5) CDC light trap with green LEDs (CDC-G), 6) Disney trap, 7) Disney trap with white LEDs, 8) sticky panels, 9) sticky panels with white LEDs, 10) delta-like trap, and 11) delta-like trap with white LEDs. A total of 1,014 specimens of 13 species and 2 genera (Lutzomyia and Brumptomyia) were collected. There were significant differences in the mean number of sand flies caught with the 11 traps; CDC-I was (P = 0.0000) more effective than the other traps. Other traps exhibited the following results: CDC-W (17.46%), CDC-B (15.68%), CDC-G (14.89%), and CDC-R (14.30%). The relative abundance of different species varied according to trap types used, and the CDC-I trap attracted more specimens of the known vectors of Leishmania spp., such as like Lutzomyia cruciata, Lu. shannoni, and Lu. ovallesi. Disney trap captured more specimens of Lu. olmeca olmeca. Based on abundance and number of species, CDC light traps and Disney traps appeared to be good candidates for use in vector surveillance programs in this endemic area of Mexico.
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Affiliation(s)
- Jorge J Rodríguez-Rojas
- 1 Universidad Autónoma de Nuevo León, Facultad de Ciencias Biológicas, Departamento de Zoología de Invertebrados, Laboratorio de Entomología Médica, Avenida Universidad s/n, Cd. Universitaria, CP 66451, San Nicolás de los Garza, Nuevo León, México
| | - Wilfredo Arque-Chunga
- 1 Universidad Autónoma de Nuevo León, Facultad de Ciencias Biológicas, Departamento de Zoología de Invertebrados, Laboratorio de Entomología Médica, Avenida Universidad s/n, Cd. Universitaria, CP 66451, San Nicolás de los Garza, Nuevo León, México
| | - Ildefonso Fernández-Salas
- 1 Universidad Autónoma de Nuevo León, Facultad de Ciencias Biológicas, Departamento de Zoología de Invertebrados, Laboratorio de Entomología Médica, Avenida Universidad s/n, Cd. Universitaria, CP 66451, San Nicolás de los Garza, Nuevo León, México
- 2 Instituto Nacional de Salud Pública (INSP), Centro Regional de Investigación en Salud Pública (CRISP), Calle 4a Avenida Norte, Centro, CP 30700, Tapachula de Córdova y Ordoñez, Chiapas, México
| | - Eduardo A Rebollar-Téllez
- 1 Universidad Autónoma de Nuevo León, Facultad de Ciencias Biológicas, Departamento de Zoología de Invertebrados, Laboratorio de Entomología Médica, Avenida Universidad s/n, Cd. Universitaria, CP 66451, San Nicolás de los Garza, Nuevo León, México
- 3 Universidad Autónoma de Nuevo León, Centro de Investigación en Ciencias de la Salud (CIDICS), Avenida Carlos Canseco s/n, Mitras Centro, CP 64460, Monterrey, Nuevo León, México
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Charlwood JD, Nenhep S, Protopopoff N, Sovannaroth S, Morgan JC, Hemingway J. Effects of the spatial repellent metofluthrin on landing rates of outdoor biting anophelines in Cambodia, Southeast Asia. MEDICAL AND VETERINARY ENTOMOLOGY 2016; 30:229-34. [PMID: 26991881 DOI: 10.1111/mve.12168] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2015] [Revised: 12/03/2015] [Accepted: 01/15/2016] [Indexed: 05/16/2023]
Abstract
The emergence of artemisinin-resistant malaria in Southeast Asia is a major problem. The fact that many people become infected with malaria when they are outside has prompted the development of 'spatial' rather than topical repellents. The respective effects of one or four slow-release emanators of metofluthrin, a pyrethroid, were tested in Pailin, Pursat and Koh Kong, Cambodia. Numbers of mosquitoes counted in outdoor landing catches when one or four emanators were suspended close to the collector were compared with control collections. In Pailin, the effects of emanators on catches in Furvela tent traps and Centers for Disease Control (CDC) light traps suspended underneath houses were also investigated. Rate ratios were used to determine differences. A total of 29 255 mosquitoes were collected over 2934 h of landing collections, 87 nights of tent trapping and 81 nights of light trap capture. In Pailin, landing rates were reduced by 48% by a single emanator and by 67% by four emanators (P < 0.001). Similar reductions were observed in the number of mosquitoes collected in tent traps and the number of anophelines only collected in light traps. Results were similar in Pursat, but, for unknown reasons, those in Koh Kong showed no difference between control and metofluthrin collections (P > 0.05). These findings suggest that although the product can produce a significant effect, it requires further improvement.
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Affiliation(s)
- J D Charlwood
- Department of Entomology, Liverpool School of Tropical Medicine, Liverpool, U.K
- SOREMA, IRD, Phnom Penh, Cambodia
| | - S Nenhep
- Centro Nacional de Malaria (CNM), Phnom Penh, Cambodia
| | - N Protopopoff
- PAMVERC Project, London School of Hygiene and Tropical Medicine, Moshi, Tanzania
| | - S Sovannaroth
- Centro Nacional de Malaria (CNM), Phnom Penh, Cambodia
| | - J C Morgan
- Department of Entomology, Liverpool School of Tropical Medicine, Liverpool, U.K
| | - J Hemingway
- Department of Entomology, Liverpool School of Tropical Medicine, Liverpool, U.K
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Dame DA, Meisch MV, Lewis CN, Kline DL, Clark GG. Field evaluation of four spatial repellent devices against Arkansas rice-land mosquitoes. JOURNAL OF THE AMERICAN MOSQUITO CONTROL ASSOCIATION 2014; 30:31-36. [PMID: 24772674 DOI: 10.2987/13-6379.1] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Four commercially available spatial repellent devices were tested in a rice-land habitat near Stuttgart, AR, after semi-field level assessments had been made at the Center for Medical, Agricultural, and Veterinary Entomology, Agricultural Research Service, US Department of Agriculture in Gainesville, FL. OFF! Clip-On(metofluthrin), Mosquito Cognito (linalool), No-Pest Strip (dichlorvos), and ThermaCELL (d-cisltrans allethrin) were selected for this study from >20 candidate products. The units based on metofluthrin, linalool, or d-cisltrans allethrin significantly reduced captures of 1 or more of the mosquito species at surrogate human sites (unlit Centers for Disease Control and Prevention traps with CO2 and octenol). Among the mosquito species analyzed statistically (Anopheles quadrimaculatus, Culex erraticus, and Psorophora columbiae), there were significantly different responses (up to 84% reduction) to individual products, suggesting that combinations of certain spatial repellents might provide significantly greater protection.
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