Contact a Valent BioSciences
public health representative.
Contact Us

Learn more about Culex spp. mosquitoes.
Read more

Learn more about West Nile virus.
Read more

VectoLex WSP

VectoLex WSP Product 

VectoLex WSP contains the active ingredient Bacillus sphaericus 2362 (strain ABTS-1743). The potency of VectoLex WSP is 50 Bs International Toxin Units (Bs ITU) per milligram against Culex quinquefasciatus larvae.

VectoLex WSP is a water-soluble pouch containing VectoLex CG. The formulation is ideal for treatment of “closed” habitats such as catch basins/storm drains and other small breeding sites. The pouch is placed directly into the breeding site and is very useful for control of West Nile virus (WNV) vectors in urban and suburban areas. Under typical environmental conditions, VectoLex WSP provides up to 4 weeks of control in catch basins/storm drains.

VectoLex WSP habitat 

Suggested use rate for “closed” habitats such as catch basins, storm drains, and similar habitats is 1 pouch per unit (e.g., 1 pouch per catch basin). Reapply as needed every 1–4 weeks. 

VectoLex WSP habitat 

Suggested use rate for “open” habitats is 1 pouch per 50 ft2 (4.6 m2). Reapply as needed every 1–4 weeks.


  • Works extremely well in polluted, “closed” habitats such as catch basins
  • Provides the industry’s most target-specific biorational for residual control of West Nile virus vectors
  • The microbial mode of action allows for easy, on-site efficacy evaluations
  • VectoLex’s fermentation consistency and pharmaceutical-grade standards significantly reduce lot-to-lot variation relative to other manufacturers, providing greater peace of mind

Developed by Request

The water-soluble pouch concept was developed at the request of mosquito control professionals. With the spread of West Nile virus in the United States beginning in 1999, Valent BioSciences was asked by mosquito abatement programs to develop a formulation that could be easily applied to catch basins for control of mosquito larvae. For this purpose, VBC introduced VectoLex WSP Bacillus sphaericus 2362 (strain ABTS-1743) in 2001. Since then, the popularity of this product launched additional WSPs from other companies for both professional and consumer use.

Downloads (pdf)