Insecticides targeting mosquito larvae (larvicides) destroy mosquitoes before they can mature into blood-sucking adults – reducing populations before they become a problem in the first place. Larvicides have two major benefits for mosquito abatement: larvae tend to aggregate in large numbers in aquatic habitats, and the majority of larvicides tend to have little to no effect on non-target species. STPMAD most often uses larvicides in roadside ditches to control Culex quinquefasciatus, the primary vector of West Nile virus in St. Tammany Parish. Larvicides are frequently sprayed using a spray truck, but can be sprayed by hand and aerially by aircraft.
Methoprene mimics a hormone found in mosquitoes that prevents emergence of pupae into adults.
| Product | SDS | Label |
| Altosid Liquid SR-20 | Altosid Liquid SDS | Altosid Liquid label |
| Altosid XR-G | Altosid XR-G SDS | Altosid XR-G Label |
| Altosid XR-B | Altosid XR-B SDS | Altosid XR-B Label |
| MetaLarv S-PT | Metalarv SDS | Metalarv Label |
Bacillus thuringiensis israelensis and Bacillus sphaericus are bacterial agents that kill mosquito larvae by binding to and rupturing the midgut lining. Spinosad is a bacterial agent that interferes with the nervous system of mosquito larvae.
| Product | SDS | Label |
| VectoBac G | VectoBac G SDS | VectoBac G Label |
| VectoBac 12 AS | Vectobac 12 AS SDS | VectoBac 12 AS Label |
| Spheratax 50G | Spheratax 50G SDS | Spheratax 50G Label |
| VectoBac WDG | VectoBac WDG SDS | VectoBac WDG Label |
| VectoBac GS | VectoBac GS SDS | VectoBac GS Label |
| VectoLex WDG | VectoLex WDG SDS | VectoLex WDG Label |
| Summit G | Summit G SDS | Summit G Label |
Surface oils form a film on the water surface. The film interrupts the mosquito larvae’s ability to breathe through their air tube.
| Product | SDS | Label |
| BVA2 | BVA2 SDS | BVA2 Label |
| CocoBear | CocoBear SDS | CocoBear Label |
Aquatic herbicides are used to reduce habitat sources for two of our most problematic marsh mosquito genera, Mansonia and Coquillettidia species.
| Product | SDS | Label |
| Procella COR | Procella COR – SC SDS | Procella COR -SC Label |
| 2,4-D | 2,4-D – SDS | 2,4-D – Label |
| Trichlopyr | Trichlopyr SDS | Trichlopyr Label |