VectoBac WG is a biological insecticide containing Bacillus thuringiensis subspecies israelensis for the control of mosquito larvae.
Active ingredient - contains 3000 itu/mg Bacillus thuringiensis subspecies israelensis (Serotype H14), fermentation solids and soluables, ATCC-1276, Strain AM62-52 in the form of a water dispersible granule.

VectoBac WG is effective against 1st to early 4th instar mosquito larvae. Larvicidal activity due to destruction of the midgut lining occurs within 12 hours of ingestion. Because 4th instar larvae do not feed prior to pupation, application must be made during the early stages of the life cycle. The use of VectoBac WG is not recommended if more than 50% of the larval population is in the late 4th instar stage.  Please read the label prior to purchase.