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- Title
Efficacy of larvicides for the control of dengue, Zika, and chikungunya vectors in an urban cemetery in southern Mexico.
- Authors
Marina, Carlos F.; Bond, J. Guillermo; Muñoz, José; Torres-Monzón, Jorge A.; Valle, Javier; Quiroz-Martínez, Humberto; Williams, Trevor
- Abstract
Many countries in Latin America have recently experienced outbreaks of Zika and chikungunya fever, in additional to the usual burden imposed by dengue, all of which are transmitted by <italic>Aedes aegypti</italic> in this region. To identify potential larvicides, we determined the toxicity of eight modern insecticides to <italic>A. aegypti</italic> larvae from a colony that originated from field-collected insects in southern Mexico. The most toxic compounds were pyriproxyfen (which prevented adult emergence) and λ-cyhalothrin, followed by spinetoram, imidacloprid, thiamethoxam, and acetamiprid, with chlorantraniliprole and spiromesifen the least toxic products. Field trails performed in an urban cemetery during a chikungunya epidemic revealed that insecticide-treated ovitraps were completely protected from the presence of <italic>Aedes</italic> larvae and pupae for 6 and 7 weeks in spinosad (Natular G30) and λ-cyhalothrin-treated traps in both seasons, respectively, compared to 5-6 weeks for temephos granule-treated ovitraps, but was variable for pyriproxyfen-treated ovitraps with and 1 and 5 weeks of absolute control in the dry and rainy seasons, respectively. Insecticide treatments influenced the mean numbers of <italic>Aedes</italic> larvae + pupae in each ovitrap, mean numbers of eggs laid, and percentage of egg hatch over time in both trials. The dominant species was <italic>A. aegypti</italic> in both seasons, although the invasive vector <italic>Aedes albopictus</italic> was more prevalent in the rainy season (26.7%) compared to the dry season (10.2%). We conclude that the granular formulation of spinosad (Natular G30) and a suspension concentrate formulation of λ-cyhalothrin proved highly effective against <italic>Aedes</italic> spp. in both the dry and rainy seasons in the cemetery habitat in this region.
- Subjects
ZIKA Virus Epidemic, 2015-2016; ZIKA virus; CHIKUNGUNYA; AEDES aegypti; DENGUE; THIAMETHOXAM; CHLORANTRANILIPROLE; INFECTIOUS disease transmission; VIRAL transmission; DISEASE risk factors
- Publication
Parasitology Research, 2018, Vol 117, Issue 6, p1941
- ISSN
0932-0113
- Publication type
Article
- DOI
10.1007/s00436-018-5891-x