Efficacy of larvicides for the control of dengue, Zika, and chikungunya vectors in an urban cemetery in southern Mexico

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 Aedes aegypti in this region. To identify potential larvicides, we determined the toxicity of eight modern insecticides to A. aegypti 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 Aedes 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 Aedes larvae + pupae in each ovitrap, mean numbers of eggs laid, and percentage of egg hatch over time in both trials. The dominant species was A. aegypti in both seasons, although the invasive vector Aedes albopictus 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 Aedes spp. in both the dry and rainy seasons in the cemetery habitat in this region.

Bibliographic Details

Main Authors:	Marina Fernández, Carlos Félix Doctor autor 14468, Bond Compeán, Juan Guillermo Doctor autor 14467, Muñoz, José autor, Valle Mora, Javier Francisco Maestro autor 10513, Quiroz Martínez, Humberto autor 15956, Torres Monzón, Jorge Aurelio autor, Williams, Trevor Doctor autor 5446
Format:	Texto biblioteca
Language:	eng
Subjects:	Insecticidas, Insectos vectores, Aedes aegypti, Aedes albopictus, Dengue, Infección por el virus zika, Fiebre chikungunya, Control de insectos, Artfrosur,
Online Access:	https://link.springer.com/article/10.1007%2Fs00436-018-5891-x
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