Standardized Back Checks of Catch Basin Larvicides Across Three Modes of Action in the North Shore Suburbs of Chicago, USA

• Published in: Journal of the American Mosquito Control Association Vol. 35; no. 2; pp. 151 - 154
• Main Authors: Harbison, Justin E, Runde, Amy, Henry, Marlon, Binnall, Jim, Koslica, Aleesha, Clifton, Mark
• Format: Journal Article
• Language: English
• Published: United States American Mosquito Control Association 01.06.2019
• Subjects: Adults; Animals; Aquatic insects; Basins; Chicago; Culicidae - growth & development; Disease control; Insect control; Insecticides; Laboratories; Larva; Larvae; Larvicides; Methoprene; Mosquito Control; Mosquitoes; Pesticides; Protocol; Pupae; Quality control; Spinosad; Suburbs; Chicago; United States > US; effectiveness; Back check; catch basin; larvicide; mosquito
• ISSN: 8756-971X; 1943-6270
• DOI: 10.2987/19-6826.1

During June through September 2018, the North Shore Mosquito Abatement District evaluated a quality control protocol for larvicide-treated catch basins that allowed for comparisons of larvicides with different modes of action. Results suggest that when applied at a rate of 2 tablespoons (approximately 20 g of product) per basin, these larvicides (VectoLex FG , Natular™ G30 Spinosad, and Altosid Pellets Methoprene) could reduce the need for retreatment for up to 4 wk or longer. Using this same protocol, Spheratax SPH (50G) was applied to a subset of approximately 900 basins and met the threshold for retreatment 1.1 wk postapplication. Despite these larvicide applications, pupae continued to be observed in non-Altosid treated basins, suggesting 100% mortality may not be attainable.