Caracterização de resistência a inseticidas em populações da subfamilia Triatominae (Hemiptera:Reduviidae), vetores de Trypanosoma cruzi Chagas, 1909

Obara, Marcos Takashi

doi:10.11606/t.6.2010.tde-13102010-134638

Cited by 2 publications

(3 citation statements)

References 66 publications

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“…Our results are consistent with variation in susceptibility to deltamethrin exhibited by various species such as Pastrongylus megistus Burmeister with an LD 50 of 2.01 ng/i (Obara, ), Triatoma brasiliensis Neiva with an LD 50 of 0.19–1.48 ng/i (Lardeux et al ., ; Obara, ) and Triatoma sordida Stål with an LD 50 of 0.173–1.59 ng/i (D'Ávila Pessoa, ; Obara, ). However, the LD 50 values of deltamethrin reported for all populations included in the present study are much higher in comparison to those reported in the literature.…”

Section: Discussionsupporting

confidence: 90%

“…Variations in susceptibility to deltamethrin have been reported for Triatoma infestans Klug from Argentina with LD 50 's from 0.02 to >200 ng/I (Vieira-Sonoda et al, 2009;Fronza et al, 2016), Brazil with LD 50 's from 0.26 to 0.70 ng/I (Vassena et al, 2000;Vieira-Sonoda et al, 2009), Paraguay with LD 50 values from 0.1 to 0.5 ng/I , and Bolivia with LD 50 values from 0.25 to 119.12 ng/i (Lardeux et al, 2010;Obara, 2010).…”

Section: Discussionmentioning

confidence: 99%

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NovelKdrmutations (K964R and A943V) in pyrethroid‐resistant populations ofTriatoma mazzottiiandTriatoma longipennisfrom Mexico and detoxifying enzymes

et al. 2018

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Although having five different ways of transmission the vector-borne is the principal way of transmission of Chagas disease, which involves insects of the subfamily Triatominae (Hemiptera: Reduviidae). Nineteen of the 31 species that occur in Mexico are associated with humans, and all are capable of transmitting the disease. Pyrethroids are the insecticides recommended for the control of these vectors in Mexico. We determined the susceptibility to the pyrethroids deltamethrin and permethrin of peridomestic populations of Triatoma mazzottii Usinger and two populations of Triatoma longipennis Usinger in comparison with a reference strain for each species. Bioassays were performed for the determination of the LD for both field populations and reference strains. A maximum of 27 fold resistance to deltamethrin was observed in T. mazzottii, meanwhile, for permethrin, T. longipennis from Jalisco show the highest value of 3.19 fold. There was significantly increased activity of esterases in field populations in comparison with their corresponding reference strain. The results of the search of kdr mutations related to the resistance to deltamethrin and permethrin in the evaluated species show the presence of mutations in the field populations, as is the case with individuals of T. mazzottii, for which the mutation was found A943V, and for the two populations of T. longipennis included in this study, we report the presence of the kdr mutation K964R. Evaluation of the various mechanisms involved in resistance to pyrethroids in triatomines from Mexico could guide us to the real justification for insecticide resistance monitoring.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

NovelKdrmutations (K964R and A943V) in pyrethroid‐resistant populations ofTriatoma mazzottiiandTriatoma longipennisfrom Mexico and detoxifying enzymes

et al. 2018

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“…In a laboratory test, Obara (11) characterized the susceptibility of three Brazilian populations of T. brasiliensis from Oieiras (Piauí) to deltamethrin (RR 50 1.75-2.17) in the laboratory bioassays. Then exposed first-instar nymphs to different substrates (clay, adobe without plaster, and unpainted wood) impregnated with deltamethrin WG250 (a commercial product) at a concentration of 25 mg a.i./m 2 .…”

Section: Ethical Considerationsmentioning

confidence: 99%

Susceptibility of Triatoma sordida Stal, 1859 (Hemiptera: Reduviidae) to alpha-cypermethrin under natural climatic conditions

Pessoa

Rosa

Cavalari

et al. 2015

Rev. Soc. Bras. Med. Trop.

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Introduction:Despite the recommendations by interpretation of resistance ratios obtained in laboratory bioassays, little is known about the actual impact of these results in the effectiveness of vector control activities in the fi eld. In this context, our objective was to determine the mean value of different resistance ratios obtained by laboratory bioassays performed as part of the chemical control strategies of Triatoma sordida in the fi eld. Methods: Field bioassays were developed in Monte Azul and Coração de Jesus (Southeast, Brazil). In each location, samples were formed with three domestic units treated with alpha-cypermethrin 20.0% (Alfatek ® 200 SC). One day after spraying, 10 fi fth-instar nymphs remained in contact with the surfaces treated (adobe with plaster, adobe without plaster, or wood) with insecticide in plastic cones for 72h. Three cones were exposed inside the intradomicile and the peridomicile. The insects in the control group were exposed to an insecticide-free piece of cardboard. Mortality was measured 72h after removal of the insects from the treated surfaces. The tests were realized in triplicate. Results: Mortality was 100.0% in all locations, except for Monte Azul; Landinho (96.6%) and Coração de Jesus; Barriguda (96.6%). Conclusions: Although the resistant populations in laboratory tests proved to be susceptible in the fi eld, this observation is not suffi cient to suggest that the cut-off points used to justify the resistance ratio should be changed. In this sense, we recommend that laboratory and fi eld bioassays are carried out with a greater number of Triatominae populations to allow more in-depth consideration of the subject.

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Caracterização de resistência a inseticidas em populações da subfamilia Triatominae (Hemiptera:Reduviidae), vetores de Trypanosoma cruzi Chagas, 1909

Cited by 2 publications

References 66 publications

NovelKdrmutations (K964R and A943V) in pyrethroid‐resistant populations ofTriatoma mazzottiiandTriatoma longipennisfrom Mexico and detoxifying enzymes

NovelKdrmutations (K964R and A943V) in pyrethroid‐resistant populations ofTriatoma mazzottiiandTriatoma longipennisfrom Mexico and detoxifying enzymes

Susceptibility of Triatoma sordida Stal, 1859 (Hemiptera: Reduviidae) to alpha-cypermethrin under natural climatic conditions

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