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Richards SL, Sousan S, Murray W, White A, Peyton K, Slade R. Development of novel compact wind tunnel for testing efficacy of insecticide formulated products in mosquitoes. Pest Manag Sci 2024. [PMID: 38345320 DOI: 10.1002/ps.8018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Revised: 01/04/2024] [Accepted: 02/08/2024] [Indexed: 02/22/2024]
Abstract
BACKGROUND Ultra-low volume (ULV) space sprays aerosolize insecticide formulated products (FP) to contact flying mosquitoes, while barrier sprays expose mosquitoes to FP residue on vegetation and other surfaces. Centers for Disease Control and Prevention bottle bioassays used to assess insecticide resistance are based on residual active ingredient (AI) exposure and do not directly relate to FP efficacy. The current pilot study developed a novel compact wind tunnel for mosquito exposure to FP. Caged Aedes albopictus and Culex pipiens/quinquefasciatus were exposed to undiluted Biomist®3 + 15 FP (permethrin AI) or air (control) within the wind tunnel, transferred to new cages, and held in a 28 °C incubator. Separate mosquitoes were exposed to residual permethrin AI (8 μg mL-1 ) in bottle bioassays. Mortality was monitored 15, 30, 60, and 120 min post-exposure. RESULTS Chi-square tests (P < 0.05) showed significantly higher mortality in Aedes compared to Culex populations for most time points in both bioassay and wind tunnel exposure groups. As expected, mosquitoes exposed to Biomist®3 + 15 showed higher mortality rates than bottle bioassay exposure to permethrin. Two Culex colonies resistant to permethrin in bottle bioassays were susceptible to Biomist®3 + 15 in the wind tunnel. CONCLUSION The novel compact wind tunnel developed here may be an alternative to field trials for testing FP efficacy, avoiding factors such as weather, logistical planning, and extended personnel hours. The wind tunnel could allow programs to conveniently test efficacy of multiple FP. Comparisons of different insecticide exposure methods provide practical information to inform operational decisions. © 2024 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
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Affiliation(s)
- Stephanie L Richards
- Department of Health Education and Promotion, Environmental Health Science Program, College of Health and Human Performance, East Carolina University, Greenville, NC, USA
| | - Sinan Sousan
- Department of Public Health, Brody School of Medicine, East Carolina University, Greenville, NC, USA
- North Carolina Agromedicine Institute, East Carolina University, Greenville, NC, USA
| | - Will Murray
- Department of Health Education and Promotion, Environmental Health Science Program, College of Health and Human Performance, East Carolina University, Greenville, NC, USA
- Department of Public Health, Brody School of Medicine, East Carolina University, Greenville, NC, USA
| | - Avian White
- Department of Health Education and Promotion, Environmental Health Science Program, College of Health and Human Performance, East Carolina University, Greenville, NC, USA
| | - Kaya Peyton
- College of Health and Sciences, Department of Environmental, Earth, and Geospatial Science, North Carolina Central University, Durham, NC, USA
| | - Raven Slade
- Department of Health Education and Promotion, Environmental Health Science Program, College of Health and Human Performance, East Carolina University, Greenville, NC, USA
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Hribar LJ, Boehmler MB, Murray HL, Pruszynski CA, Leal AL. Mosquito Surveillance and Insecticide Resistance Monitoring Conducted by the Florida Keys Mosquito Control District, Monroe County, Florida, USA. Insects 2022; 13:927. [PMID: 36292875 PMCID: PMC9603856 DOI: 10.3390/insects13100927] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Revised: 10/04/2022] [Accepted: 10/10/2022] [Indexed: 06/16/2023]
Abstract
Mosquito control programs in the State of Florida are charged with protecting human and animal health, fostering economic development of the State, permitting enjoyment of the natural attractions in Florida, and improving the quality of life of citizens. Mosquito control programs must accomplish these tasks in such a manner as will protect the environment and terrestrial, marine, and freshwater ecosystems. The Florida Keys Mosquito Control District provides a science-based Integrated Pest Management mosquito control program to the residents of the Florida Keys, Monroe County, Florida. Operational decisions are based on surveillance of adult and immature mosquitoes. Mosquito populations are monitored by means of carbon dioxide-baited light traps BG Sentinel traps, truck traps, gravid traps, oviposition traps, and human landing rate counts. Larvae and pupae are monitored by inspections of natural and human-made immature habitats. Due to past and current reliance on chemical pesticides for control of mosquitoes, the District maintains a pesticide resistance detection program consisting of CDC bottle bioassays and larval bioassays, challenging local mosquito species with currently used adulticides and larvicides.
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Affiliation(s)
| | | | - Heidi L. Murray
- Florida Keys Mosquito Control District, Marathon, FL 33030, USA
| | | | - Andrea L. Leal
- Florida Keys Mosquito Control District, Marathon, FL 33030, USA
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Richards SL, Byrd BD, Breidenbaugh M, Vandock K. Survey of United States Mosquito Control Programs Reveals Opportunities to Improve the Operational Value of Centers for Disease Control and Prevention Bottle Bioassays. J Med Entomol 2022; 59:1827-1830. [PMID: 35751624 DOI: 10.1093/jme/tjac076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Indexed: 06/15/2023]
Abstract
Mosquito control programs have increasingly used Centers for Disease Control and Prevention bottle bioassays (BB) to evaluate insecticide resistance (IR). The reported utility, benefits, and limitations of BB and other methods were assessed via electronic survey of U.S. mosquito control professionals to identify potential areas for improvement, future study, and professional training. Opportunities were identified to improve BB operational value and IR detection.
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Affiliation(s)
- Stephanie L Richards
- Environmental Health Sciences Program, Department of Health Education and Promotion, College of Health and Human Performance, East Carolina University, Greenville, NC, USA
| | - Brian D Byrd
- Environmental Health Sciences Program, Western Carolina University, Cullowhee, NC, USA
| | | | - Kurt Vandock
- Bayer Crop Science, Environmental Science, Cary, NC, USA
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Norris EJ, Bloomquist JR. Nutritional status significantly affects toxicological endpoints in the CDC bottle bioassay. Pest Manag Sci 2022; 78:743-748. [PMID: 34693614 DOI: 10.1002/ps.6687] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Revised: 10/18/2021] [Accepted: 10/25/2021] [Indexed: 06/13/2023]
Abstract
BACKGROUND The CDC Bottle Bioassay serves as an inexpensive and effective way to screen field-caught mosquitoes against a wide variety of insecticidal active ingredients and commercial formulations, with the goal of detecting resistant individuals. For this study, we assessed how sucrose-water (10% w/v) feeding status impacted the response of Aedes aegypti mosquitoes to select insecticides. RESULTS Starvation for 24 or 48 h decreased permethrin and malathion mean survival time by about 40%, with little difference in the two starvation times. Similar findings were also observed in a pyrethroid-resistant Puerto Rico strain challenged with permethrin, but these effects were less pronounced. To test the impact of mosquito weight, we measured weight under different 48-h nutritional conditions and found that sugar-water-fed and sugar-only-fed individuals were approximately the same weight (ANOVA, Bonferroni post-test P value >0.999) and that individuals fed water only were considerably lighter than either sugar-water-fed (ANOVA, Bonferroni post-test P value = 0.034) or sugar-only-fed individuals (ANOVA, Bonferroni post-test P value = 0.027) but equal in weight to starved mosquitoes (ANOVA, Bonferroni post-test P value >0.99). Of the nutritional challenges, water-only-fed mosquitoes were the most insecticide tolerant (ANOVA, Bonferroni post-test P values to all other treatments <0.01). CONCLUSIONS The results indicate insect nutritional status is an important experimental variable, particularly the hydration status of mosquitoes shortly before insecticide exposure. Moreover, as significant differences were observed between starved and component-fed (water, sugar, or sugar and water) mosquitoes in a pyrethroid-resistant strain, some caution is appropriate when interpreting resistance/susceptibility diagnoses with this bioassay. © 2021 Society of Chemical Industry. This article has been contributed to by US Government employees and their work is in the public domain in the USA.
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Affiliation(s)
- Edmund J Norris
- Emerging Pathogens Institute, Department of Entomology and Nematology, University of Florida, Gainesville, FL, USA
| | - Jeffrey R Bloomquist
- Emerging Pathogens Institute, Department of Entomology and Nematology, University of Florida, Gainesville, FL, USA
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Richards SL, Balanay JAG, Fields M, Vandock K. Baseline Insecticide Susceptibility Screening Against Six Active Ingredients for Culex and Aedes (Diptera: Culicidae) Mosquitoes in the United States. J Med Entomol 2017; 54:682-695. [PMID: 28399272 DOI: 10.1093/jme/tjw231] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2016] [Indexed: 06/07/2023]
Abstract
Mosquitoes may develop resistance to insecticide active ingredients (AI). Thus, mosquitoes should be tested for resistance to confirm efficacy of insecticide-based control, inform management decisions, and protect public and environmental health. Our objectives were to determine a baseline of resistance for six AIs used in mosquito control in the United States to assess how resistance differs between mosquito collection location, AI, and mosquito species (container-ovipositing Aedes and Culex that may oviposit in containers or other sources). Field-collected eggs from 26 mosquito populations of five different species or hybrid species (Aedes albopictus Say, Aedes triseriatus Say, Culex pipiens L., Culex quinquefasciatus Say, Culex pipiens/quinquefasciatus) were obtained from four regions across the United States. Centers for Disease Control and Prevention bottle bioassays were used to determine baseline resistance and susceptibility status for six AIs (bifenthrin, deltamethrin, etofenprox, malathion, permethrin, and phenothrin). World Health Organization guidelines were used to classify mosquitoes as susceptible (98-100% mortality at diagnostic time [DT]), possibly resistant (80-97% mortality at DT), or resistant (< 80% mortality at DT). Aedes spp. mosquitoes were less likely to exhibit resistance, compared with Culex spp. mosquitoes. A high degree of resistance to etofenprox and malathion was observed (4-26-fold greater resistance to these two AIs compared with the other examined AIs). Baseline data on resistance and susceptibility for mosquitoes exposed to commonly used insecticides may help us evaluate resistance trends and highlight the importance of assessing local resistance trends before insecticide-based control measures are implemented.
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Affiliation(s)
- Stephanie L Richards
- East Carolina University, Department of Health Education and Promotion, Environmental Health Science Program, 3403 Carol Belk Bldg., 300 Curry Court, Greenville, NC 27858 (; ; )
| | - Jo Anne G Balanay
- East Carolina University, Department of Health Education and Promotion, Environmental Health Science Program, 3403 Carol Belk Bldg., 300 Curry Court, Greenville, NC 27858 (; ; )
| | - Melinda Fields
- East Carolina University, Department of Health Education and Promotion, Environmental Health Science Program, 3403 Carol Belk Bldg., 300 Curry Court, Greenville, NC 27858 (; ; )
| | - Kurt Vandock
- Bayer Crop Science, Environmental Science/Vector Control and Pest Management, 2 T.W. Alexander Dr., Research Triangle Park, NC 27709
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