Regional Vector Ecology and Aerial Mosquito Larviciding in Southern New Jersey

• Target Zones: Aerial operations focus on remote, non-residential wetlands, predominantly the marshes bordering the Delaware River corridor in townships such as Greenwich and Logan. These geographic sectors are inaccessible by ground vehicles, amphibious equipment, or foot crews.

• Flight Logistics: Missions commonly utilize rotary-wing aircraft (helicopters) staging out of regional hubs (such as Clayton). Aircraft make low-altitude runs over designated wetland parcels, drop target-specific granular materials, and return to reload across multiple operational cycles.

• Surveillance-Driven Triggers: Operations do not follow a recurring calendar date. They deploy only when field inspectors observe larval counts exceeding defined biological thresholds following specific rain, tidal, or hydrological events across more than 3,000 monitored aquatic sites in Gloucester County.

Microbial Insecticide (Bacillus thuringiensis israelensis / Bti):

• A naturally occurring soil bacterium producing crystalline protein endotoxins (delta-endotoxins).
• Mode of action: Ingested by active suspension-feeding larvae. The alkaline environment of the larval midgut dissolves the protein crystals, releasing toxic components that bind to intestinal receptors, perforate gut walls, and induce rapid mortality.
• Selectivity: Non-toxic to mammals, fish, avian populations, and adult non-target pollinators (e.g., honeybees), exhibiting specific toxicity limited to Dipteran suborders (mosquitoes, blackflies, non-biting midges).

Insect Growth Regulator (IGR – S-Methoprene):

• A biochemical compound structurally analogous to juvenile hormone.
• Mode of action: Prevents the physiological degradation of juvenile hormone necessary for an insect to metamorphose from the late 4th instar into a pupa and subsequently an adult. The insect fails to emerge successfully from the pupal case and dies.
• Target phase: Provides residual control over late-stage larvae that have stopped active gut feeding and would otherwise escape microbial endotoxins.