Potential of repurposed agricultural ingredients in propylene glycol emulsions as oral toxicants for control of adult mosquitoes (Diptera: Culicidae)

Résumé fourni par la source

Mosquito control operations have limited options available for adult mosquito reduction. Untapped alternatives exist in adjacent pest-management industries, but translation and validation for various technologies is still ongoing. The attractive targeted sugar bait (ATSB) strategy is a formulation platform that is amenable to toxicants not otherwise widely used for adult mosquito control techniques and equipment. To find fast-acting, effective toxicants for ATSB, choice assays were conducted using fipronil, spinosyn, dinotefuran, clothianidin, imidacloprid, bifenazate, indoxacarb, abamectin, and λ-cyhalothrin against Aedes aegypti (L.) (Diptera: Culcidae) as a model system. Active ingredients were emulsified in propylene glycol, a secondary toxicant and formulation aid in ATSB, and sucrose solution. Treatments were presented in tandem with unadulterated 10% sucrose in all assays. In both 24-h mortality and fecal droplet analysis, indoxacarb was ingested similarly as often as the sugar water-only control group and yielded the overall lowest mortality. Imidacloprid, λ-cyhalothrin, and abamectin were all readily ingested, and in some cases the fecal droplet analysis indicated bias towards consumption of the treated sugar solutions. Mortality in the first 24 h was over 95% for the aforementioned toxicants, supporting that they both kill in limited time and have a suitable palatability or repellency response profile with mosquitoes. But imidacloprid and λ-cyhalothrin (resistance) and imidacloprid (pollinators) have roadblocks for use in ATSB because of potential nontarget impact to pollinators and prevalent insecticide resistance issues. However, abamectin appears to be a promising ingredient for future ATSB formulations to establish quick vector interruption and improve insecticide class variety for resistance management.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.