The influence of building materials on the residual action of BHC

Penna, R.; Oliveira, A. E. X.; Ferreira, Maria Fernanda Nince; Johnson, C. E.; Bosworth, Anthony B.; Marsden, Philip D.

doi:10.1590/s0074-02761985000400010

Cited by 6 publications

(6 citation statements)

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“…Products chosen were considered to be those most likely to be of benefit in campaigns of house spraying to control vectors of Chagas disease. Insecticide trials against triatomines, including treatments on different types of surfaces, have been previously reported by Penna et al (1985), Schofield and Williams (1985), Oliveira Filho (1992, 1999), Diotaiuti and Texeira Pinto (1991), Guillén et al (1997) We defined similar values to those found by Schofield and Williams (1985) when deltamethrin concentrationresponse was evaluated using a residual exposure method to test different insecticides against triatomines. For instance, LC 50 at 24 h in second stage nymphs of T. infestans nymphs reached at 32 mg/m 2 while 136 mg/m 2 is mentioned as LC 90 .…”

Section: Discussionmentioning

confidence: 93%

“…The type of substrate, in terms of its porosity, is of particular importance. On porous surfaces such as mud, the insecticide deposit seems to lose activity much faster than on surfaces such as wooden boards, ceramics and tiles (Barlow & Hadaway 1949, 1952, Penna et al 1985. In the case of pyrethroids, chemical breakdown may also be expected on highly alkaline surfaces and on surfaces exposed to sunlight (Leahey 1985).…”

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confidence: 99%

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Comparative evaluation of pyrethroid insecticide formulations against Triatoma infestans (Klug): residual efficacy on four substrates

Arias

Lehane

Schofield

et al. 2003

Mem. Inst. Oswaldo Cruz

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Section: Discussionmentioning

confidence: 93%

mentioning

confidence: 99%

Comparative evaluation of pyrethroid insecticide formulations against Triatoma infestans (Klug): residual efficacy on four substrates

Arias

Lehane

Schofield

et al. 2003

Mem. Inst. Oswaldo Cruz

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“…Varying residual efficacy of lambda-cyhalothrin (ICON® 10CS) has been reported ranging between 2 – 7 months on various surfaces [19-23]. Anecdotal entomological findings suggested that residual efficacy of lambda-cyhalothrin varied with different types of sprayable wall surfaces [5].…”

Section: Introductionmentioning

confidence: 99%

The impact of different sprayable surfaces on the effectiveness of indoor residual spraying using a micro encapsulated formulation of lambda-cyhalothrin against Anopheles gambiae s.s.

et al. 2015

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BackgroundThe type of sprayable surface impacts on residual efficacy of insecticide used in indoor residual spraying (IRS). However, there is limited data on common types of wall surfaces sprayed in Zanzibar and mainland Tanzania where IRS began in 2006 and 2007 respectively. The study investigated residual efficacy of micro-encapsulated lambda-cyhalothrin sprayed on common surfaces of human dwellings and domestic animal shelters in Zanzibar and mainland Tanzania.MethodsAn experimental hut was constructed with different types of materials simulating common sprayable surfaces in Zanzibar and mainland Tanzania. Surfaces included cement plastered wall, mud-daub, white-wash, wood, palm-thatch, galvanized iron-sheets, burnt-bricks, limestone and oil-paint. The World Health Organization (WHO) procedure for IRS was used to spray lambda-cyhalothrin on surfaces at the dose of 20–25 mg/m2. Residual efficacy of insecticide was monitored through cone bioassay using laboratory-reared mosquitoes; Kisumu strain (R–70) of Anopheles gambiae ss. Cone bioassay was done every fortnight for a period of 152 days. The WHO Pesticide Evaluation Scheme (WHOPES) threshold (80% mortality) was used as cut-off point for acceptable residual efficacy.ResultsA total of 5,800 mosquitoes were subjected to contact cone bioassay to test residual efficacy of lambda-cyhalothrin. There was a statistically significant variation in residual efficacy between the different types of wall surfaces (r = 0.24; p < 0.001). Residual efficacy decreased with increasing pH of the substrate (r = −0.5; p < 0.001). Based on WHOPES standards, shorter residual efficacy (42-56 days) was found in wall substrates made of cement, limestone, mud-daub, oil paint and white wash. Burnt bricks retained the residual efficacy up to 134 days while galvanized iron sheets, palm thatch and wood retained the recommended residual efficacy beyond 152 days.ConclusionThe study revealed a wide variation in residual efficacy of micro encapsulated formulation of lambda-cyhalothrin across the different types of wall surfaces studied. In areas where malaria transmission is bimodal and wall surfaces with short residual efficacy comprise > 20% of sprayable structures, two rounds of IRS using lambda-cyhalothrin should be considered. Further studies are required to investigate the impact of sprayable surfaces on residual efficacy of other insecticides commonly used for IRS in Zanzibar and mainland Tanzania.

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“…On the contrary, the rapid absorption by the brick porous surfaces led to a much faster loss of deltamethrin activity [58]. Several other studies have also found similar results with insecticides losing their toxicity much faster on porous surfaces than on smooth surfaces such as wood panels, and ceramic tiles [59][60]. The duration of bio-e cacy should be within the residuality range found in previous studies or according to WHO recommendations.…”

Section: Discussionmentioning

confidence: 63%

Fenitrothion Bio-Efficacy on Different Intradomicile Surface Types Against Anopheles (Nyssorhynchus) Albimanus in the Main Malaria Endemic Regions of Panama

Carrera

Ramı́rez

Torres-Cosme

2020

Preprint

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Background: The use of intradomicile residual insecticide on a large scale is a proven and efficacious intervention against malaria mosquito vectors. The objective of the study was determined the bio-efficacy and resistance of fenitrothion insecticide against the mosquito An. (Nyssorhynchus.) albimanus Wiedemann. Methods: This study included seven communities located in different endemic regions where fenitrothion is used to control An. (Nys.) albimanus populations. The test of bio-efficacy and susceptibility were conducted following the WHO standard bioassay methodology.Results: The average percent mortality of An. (Nys.) albimanus exposed to fenitrothion in the seven communities tested were 96% and 92% for the first two months. This bio-efficacy was maintained until the fifth month with 81% mortality in communities with high IRS coverage. Anopheles (Nys.) albimanus was susceptible to the organophosphate insecticides fenitrothion and malathion, as well as to carbamate Propoxur but resistant to pirimiphos-methyl and chlorpyrifos.Conclusion: This study demonstrates that fenitrothion maintains an elevated insecticide residuality and toxic effect on different types of surfaces until the fifth month post-application. Furthermore, An. (Nys.) albimanus remains highly susceptible to this insecticide, providing a high degree of protection against mosquito bites inside households, and interrupting malaria transmission in places with high IRS coverage and where the mosquito is still susceptible to fenitrothion application.

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The influence of building materials on the residual action of BHC

Cited by 6 publications

References 0 publications

Comparative evaluation of pyrethroid insecticide formulations against Triatoma infestans (Klug): residual efficacy on four substrates

Comparative evaluation of pyrethroid insecticide formulations against Triatoma infestans (Klug): residual efficacy on four substrates

The impact of different sprayable surfaces on the effectiveness of indoor residual spraying using a micro encapsulated formulation of lambda-cyhalothrin against Anopheles gambiae s.s.

Fenitrothion Bio-Efficacy on Different Intradomicile Surface Types Against Anopheles (Nyssorhynchus) Albimanus in the Main Malaria Endemic Regions of Panama

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