VectoBac Midge Fly Killer

Biological larvicide built on Bacillus thuringiensis subsp. israelensis strain AM65-52. It works on the larval stage in standing water rather than on adults, so the population comes down before the larvae become biting adults. Labeled habitats include ponds, ditches and catch basins. Sold in granular and aqueous formulations; see the label for the sites and rates of the formulation on hand.