High resurgence of dengue vector populations after space spraying in an endemic urban area of Thailand: A cluster randomized controlled trial

Sudsom, Napadol; Techato, Kuaanan; Thammapalo, Suwich; Chongsuvivatwong, Virasakdi; Pengsakul, Theerakamol

doi:10.1016/j.apjtb.2015.07.022

Cited by 6 publications

(5 citation statements)

References 12 publications

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“…remained alive after ULV treatments (Tables 1 and 2). Transient declines in mosquito population following an adulticide treatment have been described in a variety of previous works (Mitchell et al 1970, Chadeeq 1985, Andis et al 1987, Focks et al 1987, Chua et al 2005, Pawelek et al 2014, Sudsom et al 2015, Stoddard 2018. In some cases, a rebound in mosquito population has been attributed to immigration from surrounding treatment areas, and, in general, this seems possible (Mitchell et al 1970, Reddy et al 2006.…”

Section: Variablementioning

confidence: 85%

“…Finally, trapping mosquitoes over a large area for an extended time with conventional trapping technologies is extremely labor intensive and expensive. For this reason, evaluations of the effectiveness of ULV adulticides on natural adult mosquito populations do exist but are limited (Mitchell et al 1970, Chadeeq 1985, Andis et al 1987, Fox and Specht 1988, Elnaiem et al 2008, Sudsom et al 2015, Stoddard 2018. Other strategies for assessing the effect of ULV treatments on mosquito populations have relied on egg counts or immature mosquito counts to detect changes in the population after a treatment with notably mixed results (Andis et al 1987, Chua et al 2005, Reddy et al 2006.…”

Section: Introductionmentioning

confidence: 99%

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Gravid Culex pipiens Exhibit A Reduced Susceptibility to Ultra–Low Volume Adult Control Treatments Under Field Conditions

Clifton

Xamplas

Nasci

et al. 2019

Journal of the American Mosquito Control Association

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In July and August of 2018, a field trial was conducted to examine the effectiveness of the North Shore Mosquito Abatement District's operational ultra–low volume (ULV) adulticide program. Two study sites were selected in Skokie, IL, and treated by truck-based ULV with d-phenothrin and prallethrin synergized with piperonyl butoxide over the course of a month. Natural mosquito populations were sampled via Biogents (BG)-counter baited with CO2 or Alfalfa infusion. The results from this study demonstrate that host-seeking mosquitoes were reduced by 65.3% after ULV treatment while gravid mosquitoes were reduced by only 29.2%. In addition, host-seeking mosquitoes rebounded dramatically (303.1%) 3 days posttreatment while gravid mosquitoes did not (5.7%). Based on the differential effect between gravid and host-seeking mosquitoes, we concluded that the gonotrophic cycle and timing of ULV adulticide operations are important factors affecting the resistance of West Nile virus vectors to pyrethroid exposures.

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Section: Variablementioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Gravid Culex pipiens Exhibit A Reduced Susceptibility to Ultra–Low Volume Adult Control Treatments Under Field Conditions

Clifton

Xamplas

Nasci

et al. 2019

Journal of the American Mosquito Control Association

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“…aegypti control due to their increased coverage, ease and speed of application, low cost and visibility to communities in comparison to the laborious peri-focal application [ 8 ]. Unfortunately, such area-wide approaches have no residual efficacy and have proven largely ineffective in preventing dengue transmission [ 8 , 36 ]. Furthermore, there is indirect evidence suggesting that ULV applications are associated with rapid evolution of insecticide resistance (primarily to pyrethroids) [ 36 , 37 ].…”

Section: Discussionmentioning

confidence: 99%

“…Unfortunately, such area-wide approaches have no residual efficacy and have proven largely ineffective in preventing dengue transmission [ 8 , 36 ]. Furthermore, there is indirect evidence suggesting that ULV applications are associated with rapid evolution of insecticide resistance (primarily to pyrethroids) [ 36 , 37 ]. IRS is now re-emerging as an alternative Ae .…”

Section: Discussionmentioning

confidence: 99%

Deltamethrin resistance in Aedes aegypti results in treatment failure in Merida, Mexico

et al. 2017

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The operational impact of deltamethrin resistance on the efficacy of indoor insecticide applications to control Aedes aegypti was evaluated in Merida, Mexico. A randomized controlled trial quantified the efficacy of indoor residual spraying (IRS) against adult Ae. aegypti in houses treated with either deltamethrin (to which local Ae. aegypti expressed a high degree of resistance) or bendiocarb (to which local Ae. aegypti were fully susceptible) as compared to untreated control houses. All adult Ae. aegypti infestation indices during 3 months post-spraying were significantly lower in houses treated with bendiocarb compared to untreated houses (odds ratio <0.75; incidence rate ratio < 0.65) whereas no statistically significant difference was detected between the untreated and the deltamethrin-treated houses. On average, bendiocarb spraying reduced Ae. aegypti abundance by 60% during a 3-month period. Results demonstrate that vector control efficacy can be significantly compromised when the insecticide resistance status of Ae. aegypti populations is not taken into consideration.

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“…However, the authors found that droplet volume median diameter averaging 4 lm in the interior areas of the house that resulted in approximately 2 min of ''potential insecticide exposure'' may be sufficient for vector contact. Sudsom et al (2015) suggested indoor ULV as an effective method of space spraying, which has greater potential to control indoor adult dengue vector populations than outdoor ULV spraying. They found that indoor mosquito density was not significantly different between outdoor and indoor ULV sprays 2 days before and 6 days after space spraying, but the density after the indoor sprays was significantly less than the density after the outdoor sprays at 1 and 2 days postspraying.…”

Section: Introductionmentioning

confidence: 99%

Potential of Outdoor Ultra-Low–Volume Aerosol and Thermal Fog to Suppress the Dengue Vector,Aedes aegypti, Inside Dwellings

Farooq¹,

Cilek²,

Sumners³

et al. 2020

Journal of the American Mosquito Control Association

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A field study investigated penetration of outdoor ground ultra-low–volume (ULV) aerosol and thermal fog adulticide applications into a dwelling to control the dengue vector Aedes aegypti (L). Four applications of Kontrol 4-4 (4.6% permethrin active ingredient [AI], 4.6% piperonyl butoxide) at the maximum label rate were made at 25–30 m in front of a house at Camp Blanding Joint Training Center, Starke, FL, during summer 2016. The ULV sprayer and thermal fogger nozzles were oriented horizontally, and vehicle travel speeds were 16 and 24 km/h, respectively. All doors and windows of the house were left open. Spray efficacy was assessed using caged female mosquitoes positioned 30 cm above ground, outside and inside of the house. Interior cages were placed in open areas and cryptic sites (i.e., in a closet or cardboard box). A spinner holding 2 rods sized 3 mm × 75 mm was deployed next to each cage (except cryptic sites) to sample droplets and to quantify AI deposition. Thirty minutes after application, cages were removed, slides collected, and mosquitoes transferred to clean cages in the laboratory where mortality was assessed at 24 h posttreatment. The ULV application to the south side of the house produced 100% mortality in outdoor and indoor cages and 24% mortality at cryptic sites. Similarly applied thermal fog resulted in 85% mortality outdoors, 34% indoors, and only 4% in cages at cryptic sites. Application of either method from the west resulted in 19–61% mortality outdoors and 0.5–6.5% indoors. Droplet volume median diameter (Dv0.5) on rods from the ULV application was significantly larger compared with the thermal fogger outdoors, but similar indoors. Outdoors and indoors, the AI deposition from ULV was significantly higher than from thermal fog. Our results show the potential for controlling dengue vectors inside houses with outdoor ground ULV applications in areas where doors and windows are left open for ventilation.

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High resurgence of dengue vector populations after space spraying in an endemic urban area of Thailand: A cluster randomized controlled trial

Cited by 6 publications

References 12 publications

Gravid Culex pipiens Exhibit A Reduced Susceptibility to Ultra–Low Volume Adult Control Treatments Under Field Conditions

Gravid Culex pipiens Exhibit A Reduced Susceptibility to Ultra–Low Volume Adult Control Treatments Under Field Conditions

Deltamethrin resistance in Aedes aegypti results in treatment failure in Merida, Mexico

Potential of Outdoor Ultra-Low–Volume Aerosol and Thermal Fog to Suppress the Dengue Vector,Aedes aegypti, Inside Dwellings

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