Latin American Symposium
Latin American Symposium
Increased reports of pyrethroid resistance in most Latin American countries are challenging Vector Control Programs to move either to newly developed insecticide groups or to safer and well-known organophosphate compounds. Actellic 300 CS is a capsule formulation designed to prolong residuality when used by contact indoor residual spraying (IRS) versus indoor resting mosquitoes. However, Actellic 300 CS studies focusing on its airborne action properties have been poorly documented. Considering some interesting facts, such as being an organophosphate product and presenting a very low dermal and oral toxicity, we conducted a small-scale ULV treatment on ten households in Monterrey City, NE, Mexico.
Female Aedes aegypti were placed in 15 x 10 x 30 cm cages and distributed in indoor of house rooms. Mosquito cages were also placed at outdoor house backyards. Two control houses were used concurrently. Actellic 300 CS was prepared by mixing an 833-ml bottle in 10 L of water to yield a 1 gr a. i./m2. The latter concentration is recommended for resting Anopheles in Africa, but because an indoor ULV dose is unavailable, we decided to use it as cold fogging. We aimed to explore the potential results of airborne activity of the capsule formulation. The flow rate was 150 ml/min, while the mean diameter of the microdroplet was 23.7 microns.
Results: Indoor and outdoor 24-hour mortality was 100% for both locations. Females Ae. Aegypti were knocked down one after spraying as high as 99.2% and 97.5%, indoor and outdoor, respectively. No complaints were noticed by house dwellers related to skin irritation or fuel odor. Results show an optimistic potential of recommending Actellic 300 CS as a house ULV treatment during severe Dengue outbreaks in Latin America.