Aerial ULV control of Aedes aegypti with naled (Dibrom) inside simulated rural village and urban cryptic habitats

Britch, Seth C.; Linthicum, Kenneth J.; Aldridge, Robert L.; Breidenbaugh, Mark S.; Latham, Mark; Connelly, Peter H.; Rush, Mattie J. E.; Remmers, J. L.; Kerce, Jerry D.; Silcox, Charles A.

doi:10.1371/journal.pone.0191555

Cited by 9 publications

(7 citation statements)

References 22 publications

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“…aegypti , and consequently, reduced significantly the indoor recruitment of adults entering the home environment. This can be considered an alternative explanation to the proposed by Britch and cols (2018), who establishes that the insecticidal effect of a formulation applied as ULV could also act as a vapor, and not only as droplets. We discarded such hypothesis in our study because the insecticide used was an oil-based formulation, more resistant to evaporation compared with water-based formulation.…”

Section: Discussionmentioning

confidence: 81%

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Entomological Efficacy of Aerial Ultra-Low Volume Insecticide Applications Against Aedes aegypti (Diptera: Culicidae) in Mexico

Correa-Morales

Dzul-Manzanilla

Bibiano-Marín

et al. 2019

Journal of Medical Entomology

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A cluster-randomized controlled trial quantified the entomological efficacy of aerial ultra-low volume (AULV) applications of the insecticide chlorpyrifos against Aedes aegypti in Puerto Vallarta, México, during November–October 2017. The trial involved 16 large (1 × 1 km) clusters distributed between treatment-control arms. Primary endpoint was the abundance of Ae. aegypti indoors (total adults, females, and blood-fed females) collected using Prokopack aspirators. After four consecutive weekly cycles of AULV, all adult Ae. aegypti infestation indices were significantly lower in the treatment arm (OR and IRR ≤ 0.28). Efficacy in reducing indoor Ae. aegypti increased with each weekly application cycle from 30 to 73% (total adults), 33 to 76% (females), and 45.5 to 89% (blood-fed females). Entomological indices remained significantly lower in the treatment arm up to 2 wk after the fourth spraying round. Performing AULV spraying can have significant and lasting entomological impact on Ae. aegypti as long as multiple (ideally four) spray cycles are implemented using an effective insecticide.

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Section: Discussionmentioning

confidence: 81%

“…aegypti is that the spray droplets do not reach mosquitoes resting indoors. Britch et al (2018) recently performed an experimental study investigating the capability of the organophosphate naled (Dibrom) applied from a fixed wing ULV spray platform to penetrate indoor habitats containing adult Ae. aegypti mosquitoes.…”

Section: Discussionmentioning

confidence: 99%

Entomological Efficacy of Aerial Ultra-Low Volume Insecticide Applications Against Aedes aegypti (Diptera: Culicidae) in Mexico

Correa-Morales

Dzul-Manzanilla

Bibiano-Marín

et al. 2019

Journal of Medical Entomology

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“…aegypti usually show high levels of efficacy, ca. 100% mortality after 24 h (Kilpatrick et al 1970, Lofgren et al 1970, Uribe et al 1984, CDC 1987, Britch et al 2018. No previously published studies report the efficacy of chlorpyrifos and neonicotinoid-pyrethroid formulations applied aerially against Ae.…”

Section: Discussionmentioning

confidence: 99%

Field Efficacy Trials of Aerial Ultra-Low-Volume Application of Insecticides Against Caged Aedes aegypti in Mexico

Dzul-Manzanilla¹,

Correa-Morales²,

Medina-Barreiro³

et al. 2019

Journal of the American Mosquito Control Association

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We evaluated the efficacy of aerial ultra-low-volume (ULV) insecticide spraying in field bioassays with caged Aedes aegypti in May 2017 in Puerto Vallarta, Jalisco, Mexico. The insecticides tested included an organophosphate (Mosquitocida UNO ULV) and a neonicotinoid-pyrethroid combination (Cielo). Two Ae. aegypti populations were evaluated: a field pyrethroid-resistant local strain (Puerto Vallarta) and an insecticide-susceptible laboratory strain (New Orleans). Knockdown after 1 h by both products was !97.0%, and mortality after 24 h was !98% for the susceptible laboratory strain. Knockdown of the local Puerto Vallarta field strain by both products after 1 h was !96.5%; and mosquito mortality after 24 h was also very high (!98%). Meteorological conditions during this evaluation were favorable for aerial mosquito control and represented conditions that typically occur during adulticide space spray applications. Temperature oscillated between 248C and 268C with winds between 6 and 10 km/h. The majority of droplets met the droplet distribution criteria required for the insecticides. The evaluation demonstrated an acceptable performance of both products for Ae. aegypti control when applied undiluted at a rate of 199.4 ml/ha and 73.07 ml/ha for Mosquitocida UNO ULV and Cielo, respectively. The volume median diameter (VMD) droplet size was characterized at 31.3 lm and 37.3 lm, respectively.

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“…Also, maps of droplet distribution and density do not fully illustrate pesticide efficacy, because the assumption is that the presence of a threshold number of droplets of a certain size automatically indicates target insect mortality. This assumption does not account for mortality from evaporative products from droplets through the target area that may also induce mortality 10 , or that a lower number of droplets or other droplet sizes may kill some proportion of target individuals. The original rationale 10,11,12 is that an aerosol pesticide is designed to impinge small droplets on actively flying target insects.…”

Section: Introductionmentioning

confidence: 99%

“…This assumption does not account for mortality from evaporative products from droplets through the target area that may also induce mortality 10 , or that a lower number of droplets or other droplet sizes may kill some proportion of target individuals. The original rationale 10,11,12 is that an aerosol pesticide is designed to impinge small droplets on actively flying target insects. However, our observations in the field, including reductions in natural populations after spraying when target insects are not actively flying, suggest that droplets or evaporative products from droplets are reaching targets that are not flying but rather hidden in resting refugia (unpublished data 2011).…”

Section: Introductionmentioning

confidence: 99%

Visualizing Efficacy of Pesticides Against Disease Vector Mosquitoes in the Field

Britch

Linthicum

Aldridge

et al. 2019

JoVE

Self Cite

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Efficacy of public health pesticides targeting nuisance and disease-vector insects such as mosquitoes, sand flies, and filth-breeding flies is not uniform across ecological zones. To best protect public and veterinary health from these insects, the environmental limitations of pesticides need to be investigated to inform effective use of the most appropriate pesticide formulations and techniques. We have developed a research program to evaluate combinations of pesticides, pesticide application equipment, and application techniques in hot-arid desert, hot-humid tropical, warm and cool temperate, and urban locations to derive pesticide use guidelines specific to target insect and environment. To these ends we designed a system of protocols to support efficient, cost-effective, portable, and standardized evaluation of a diverse range of pesticides and equipment across multiple environments. At the core of these protocols is the use of an array of small cages with colony-reared sentinel mosquitoes (adults and immatures) and sand flies (adults), strategically arranged in natural habitats and exposed to pesticide spray. Spatial and temporal patterns of pesticide efficacy are derived from percent mortality in sentinel cages, then mapped and visualized in a geographic information system. Maps of sentinel mortality data may be statistically compared to evaluate relative efficacy of a pesticide across multiple environments, or to study multiple pesticides in a single environment. Protocols may be modified to accommodate a variety of scenarios, including, for example, the vertical orientation of sentinels in canopy habitats or simultaneous testing of ground and aerial application methods.

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Aerial ULV control of Aedes aegypti with naled (Dibrom) inside simulated rural village and urban cryptic habitats

Cited by 9 publications

References 22 publications

Entomological Efficacy of Aerial Ultra-Low Volume Insecticide Applications Against Aedes aegypti (Diptera: Culicidae) in Mexico

Entomological Efficacy of Aerial Ultra-Low Volume Insecticide Applications Against Aedes aegypti (Diptera: Culicidae) in Mexico

Field Efficacy Trials of Aerial Ultra-Low-Volume Application of Insecticides Against Caged Aedes aegypti in Mexico

Visualizing Efficacy of Pesticides Against Disease Vector Mosquitoes in the Field

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