Selection of Oviposition Sites by Female Aedes aegypti Exposed to Two Larvicides

Abstract

The selection of oviposition sites by female mosquitoes involves the ability to choose less dangerous larval habitats. The aim of the present study was to evaluate the ovipositional behavior of female Aedes aegypti in selecting sites treated with 2 different larvicides. The study was conducted in metal cages with plastic cups containing paper strips and either spinosad or temephos, or dechlorinated water (control). After exposing all treated and control cups to ovipositing female mosquitoes for 3 days, the paper strips were removed and examined for egg laying. Based on the number of eggs laid per treatment, the oviposition index was found positive for spinosad (0.66) but negative for temephos (-0.49), indicating that the natural product spinosad acted as an attractant and temephos as a repellent.

Investigation of mosquito oviposition pheromone as lethal lure for the control of Aedes aegypti (L.) (Diptera: Culicidae)

“…Although Humberto et al . [ 25 ] had demonstrated temephos post repellency properties when compared to another insecticide, spinosad, but the present study had showed the capability of caproic acid to reverse the repellency effect of temephos. This is demonstrated in the OAI of this study that lethal lure which contained caproic acid and temephos was 0.22 (attracting) while temephos that contained temephos in dechlorinated water was -0.26 (repelling).…”

Agricultural chemicals: life changer for mosquito vectors in agricultural landscapes?

“…israelensis but did not discriminate between tap water or untreated grass infusion [ 61 ]. Gravid females of Aedes aegypti were attracted to spinosad-treated oviposition substrates but avoided temephos-treated substrates [ 62 ]. Similarly, Eugenol, citronellal, thymol, pulegone, rosemary oil, and cymene acted as oviposition deterrents for Ae.…”

Productividad de Aedes aegypti (L.) (Diptera: Culicidae) en viviendas y espacios públicos en una ciudad endémica para dengue en Colombia

“…La vigilancia entomológica del vector se lleva a cabo principalmente en las viviendas, donde se han identificado los sitios de cría más productivos para su desarrollo (5,6). Aunque en los espacios públicos (7) la productividad está muy asociada a los períodos de lluvia y de sequía (8), estos representan sitios de refugio para los mosquitos, particularmente ante la fuerte presión que el control ejerce en las viviendas (9). En Colombia, la vigilancia entomológica del vector consiste en la determinación de los índices de infestación de Ae.…”