Comparative developmental and susceptibility to insecticide of Bolivian and Brazilian populations of Triatoma infestans

Pires, Herton Helder Rocha; Barbosa, Silvia Ermelinda; Diotaiuti, Liléia

doi:10.1590/s0074-02762000000600025

Cited by 6 publications

(6 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Most experimental studies indeed focus on a single stage and typically measure effects of insecticide on survival of eggs (6%), first and fifth instars (86%, 4%) or adults (4%) of triatomines caught in their domestic (35%), peridomestic (58%) and sylvatic (7%) habitats (data from Appendix in Supporting Information). Some pioneering attempts provide interesting estimates of both fecundity and longevity of the different stages from colonies with different levels of resistance to deltamethrin (Germano & Picollo, ; Pires, Barbosa, & Diotaiuti, ). More resistant populations laid a lower number of eggs (Germano & Picollo, ) of higher weight (Pires et al., ).…”

Section: Triatomine Life‐history Evolution and Vector Control Challengesmentioning

confidence: 99%

“…Some pioneering attempts provide interesting estimates of both fecundity and longevity of the different stages from colonies with different levels of resistance to deltamethrin (Germano & Picollo, ; Pires, Barbosa, & Diotaiuti, ). More resistant populations laid a lower number of eggs (Germano & Picollo, ) of higher weight (Pires et al., ). Meanwhile, those studies show an extension of egg or duration of instar stages in resistant individuals with compensation in others, so that there is overall no effect of resistance on the length of the complete life cycle.…”

Section: Triatomine Life‐history Evolution and Vector Control Challengesmentioning

confidence: 99%

See 1 more Smart Citation

Evolutionary ecology of Chagas disease; what do we know and what do we need?

Flores-Ferrer

Marcou

Waleckx

et al. 2017

Evolutionary Applications

View full text Add to dashboard Cite

The aetiological agent of Chagas disease, Trypanosoma cruzi, is a key human pathogen afflicting most populations of Latin America. This vectorborne parasite is transmitted by haematophageous triatomines, whose control by large‐scale insecticide spraying has been the main strategy to limit the impact of the disease for over 25 years. While those international initiatives have been successful in highly endemic areas, this systematic approach is now challenged by the emergence of insecticide resistance and by its low efficacy in controlling species that are only partially adapted to human habitat. In this contribution, we review evidences that Chagas disease control shall now be entering a second stage that will rely on a better understanding of triatomines adaptive potential, which requires promoting microevolutionary studies and –omic approaches. Concomitantly, we show that our knowledge of the determinants of the evolution of T. cruzi high diversity and low virulence remains too limiting to design evolution‐proof strategies, while such attributes may be part of the future of Chagas disease control after the 2020 WHO's target of regional elimination of intradomiciliary transmission has been reached. We should then aim at developing a theory of T. cruzi virulence evolution that we anticipate to provide an interesting enrichment of the general theory according to the specificities of transmission of this very generalist stercorarian trypanosome. We stress that many ecological data required to better understand selective pressures acting on vector and parasite populations are already available as they have been meticulously accumulated in the last century of field research. Although more specific information will surely be needed, an effective research strategy would be to integrate data into the conceptual and theoretical framework of evolutionary ecology and life‐history evolution that provide the quantitative backgrounds necessary to understand and possibly anticipate adaptive responses to public health interventions.

show abstract

Section: Triatomine Life‐history Evolution and Vector Control Challengesmentioning

confidence: 99%

Section: Triatomine Life‐history Evolution and Vector Control Challengesmentioning

confidence: 99%

Evolutionary ecology of Chagas disease; what do we know and what do we need?

Flores-Ferrer

Marcou

Waleckx

et al. 2017

Evolutionary Applications

View full text Add to dashboard Cite

show abstract

“…Sorokin. Pires et al (1998Pires et al ( , 2000 also found morphological and biological differences between Bolivian and Brazilian populations of T. infestans.…”

Section: Mortality Of T Infestans Under Constant and Fluctuatingmentioning

confidence: 88%

“…Sorokin. Pires et al (1998Pires et al ( , 2000 also found morphological and biological differences between Bolivian and Brazilian There were no significant differences in the assay with daily fluctuation cycles (12:12h) and two temperatures: 18/26ºC and 26/18ºC, or 34/26ºC and 26/34ºC (Table 1). These data indicate that mortality is not affected by the order in which extreme temperatures (18ºC or 34ºC) occur, before or after the optimal temperature (26ºC).…”

Section: Mortality Of T Infestans Under Constant and Fluctuatingmentioning

confidence: 89%

Effect of constant and cyclical temperatures on the mortality of Triatoma infestans (Klug) (Hemiptera: Reduviidae) treated with Beauvaria bassiana (Bals.) Vuill. (Hyphomycetes)

Lecuona¹,

Rodriguez²,

Rossa³

2005

Neotrop. Entomol.

View full text Add to dashboard Cite

Neotropical Entomology 34(4): 675-679 (2005) Efecto de Temperaturas Constantes y Cíclicas sobre la Mortalidad de Triatoma infestans (Klug) (Hemiptera:Reduviidae) Tratada con Beauveria bassiana (Bals.) Vuill. (Hyphomycetes) RESUMEN -En el presente trabajo se analizó la mortalidad de Triatoma infestans (Klug) tratada con Beauveria bassiana (Bals.) Vuill. bajo diferentes régimenes de temperatura. Los porcentajes de mortalidad a 26ºC y a 22ºC fueron más altos mientras que los más bajos se registraron a 34ºC constantes. Las combinaciones 26/34ºC o 34/26ºC (12:12h) fueron significativamente diferentes a las de 18/26ºC o 26/ 18ºC mostrando que es mayor el efecto de altas temperaturas (34ºC) sobre la mortalidad e indicando también que con una temperatura extrema alta unida a una óptima de 26ºC, decrece la susceptibilidad de T. infestans a la infección por parte de B. bassiana. Se observó que la exposición a temperaturas extremas (18ºC o 34ºC) junto a la óptima de 26ºC en ciclos de 8:8:8h reduce la mortalidad de T. infestans. Con alternancia de 6h (6:6:6:6h) se observó que sólo la mortalidad de la combinación 34/30/26/22°C fue similar a las de 22ºC y 26ºC constantes. La ocurrencia de temperaturas extremas durante el primer tramo afectan menos la mortalidad si el período en que ocurren no es tan largo (p.ej. 6h). Sin embargo, si a una temperatura extrema inicial le sigue una caída abrupta (34/22/26/30ºC), la mortalidad se ve significativamente reducida. Los resultados indicarían que es preferible realizar las aplicaciones en el campo al atardecer, para evitar la influencia negativa de cambios bruscos de temperaturas o temperaturas elevadas durante las primeras etapas críticas del ciclo infeccioso de los hongos entomopatógenos.PALABRAS CLAVE: Regímen fluctuante, germinación, hongo entomopatógeno ABSTRACT -The mortality of Triatoma infestans (Klug) treated with Beauvaria bassiana (Bals.) Vuill. under several temperature regimes was analyzed. Mortality rates were highest at 26ºC and 22ºC and lowest at constant 34ºC. The combinations 26/34ºC or 34/26ºC (12:12h cycles) were significantly different from the combinations 18/26ºC and 26/18ºC, showing that high temperatures (34ºC) affect mortality most significantly. The combinations also indicate that when an extreme high temperature is associated with an optimal temperature of 26ºC, the susceptibility of T. infestans to B. bassiana infection decreases. Exposure to extreme temperature (18ºC or 34ºC) associated with an optimal temperature of 26ºC in 8:8:8h cycles, reduces the mortality of T. infestans. In cycles of 6:6:6:6h, only the mortality associated with the 34/30/26/22ºC combination was similar to the combinations at constant 22ºC and 26ºC. Extreme temperatures during the first stage affect mortality less than when this period is not longer than 6h. Mortality decreases significantly when an extreme high initial temperature is followed by an abrupt fall (34/22/26/30ºC). Our results indicate that Beauvaria bassiana should be applied to the field in the late afternoon to avo...

show abstract

“…In other words, T iofestans is brought into the surrounding countries by trave]ers from Bolivia; thus, it is not found outdoors and inhabit only indoors (Pires et al,, 2000), and is considered to be easily eradicated by measures such as spraying of insecticides merely indoors. In contrast, large numbers of Z iofestans in Bolivia inhabit outdoors as well (Pires et al, 2000), so even if measures to deal with triatomine bugs are taken merely indoors, for example, they can reenter by fiying in, so it is thought of as a foe that cannot be easily eradicated.…”

Section: ) Brazilmentioning

confidence: 99%

Triatomine bugs in the State of Santa Cruz, Bolivia, and northeastern portions of Brazil, with special reference to their infection rate with Trypanosoma cruzi

Horio¹,

Masuda

Miura

et al. 2005

Jap. J. Sanit. Zool.

View full text Add to dashboard Cite

The number and species of triatomine bugs collected in houses in the State of Santa Cruz, Bolivia, where Chagas disease infection from mothers to infants is frequently reported, and the infection rate of Tmpanosoma cruz in bugs are shewn in this study. The result was that large numbers of Tn'atoma injlestans were collected indoors, their infection rate of 71 cruzi is extremely high, an average of 80.5%; suggesting that the infection cycle of Chagas disease occurs indoors, In addition, because the T, cntzi-IgG antibody-positive rate for humans in this region is also high at 84.0%, residents are surmised to be in danger of constant infection, In contrast, there are almost no triatomine bugs in dwellings in the northeastern portion of Brazil where infection from mothers to infants has not been reported; triatomine bugs were found only in sheds for animals. However, these triatomine bugs are zoophilic (e.g. feeding on birds) and their infection rate with T crztzi was extremely low, so the risk of Chagas disease is thought to be extrernely low.

show abstract

Comparative developmental and susceptibility to insecticide of Bolivian and Brazilian populations of Triatoma infestans

Cited by 6 publications

References 9 publications

Evolutionary ecology of Chagas disease; what do we know and what do we need?

Evolutionary ecology of Chagas disease; what do we know and what do we need?

Effect of constant and cyclical temperatures on the mortality of Triatoma infestans (Klug) (Hemiptera: Reduviidae) treated with Beauvaria bassiana (Bals.) Vuill. (Hyphomycetes)

Triatomine bugs in the State of Santa Cruz, Bolivia, and northeastern portions of Brazil, with special reference to their infection rate with Trypanosoma cruzi

Contact Info

Product

Resources

About