South Florida Audubon Society


Mosquito Spraying

VectoBac WDG is probably the least environmentally damaging of all the insecticides on the market today. The main ingredient is Bacillus thuringiensis israelensis which is a natural bacterium. Years ago when I had 100-150 tomato plants in the ground, I sprayed with it twice per season to control nematodes. It didn't seem to affect pollination as I had good crops and I am assuming it had little effect on pollinators.

It only affects the larval stage of insects, so as long as it can't find its way into hives, it won't have the disastrous effect on bees that South Carolina just experienced. Butterflies and other pollinators may be susceptible in larval stages, but the timing of the spraying can be adjusted to times when there is little larval activity.

It won't have the ill effects on children and elderly folks, asthma and COPD sufferers or heart disease patients that Naled would have.

Product Description
VectoBac WDG is a water-dispersible granule formulation of Bacillus thuringiensis subsp. israelensis (strain AM65-52) for control of mosquito larvae. The product has a potency of 3,000 International Toxin Units (ITU) per milligram against Aedes aegypti larvae. It is designed for use in aqueous spray mixes and for direct application. VectoBac WDG was the first bacterial larvicide to complete the World Health Organization Pesticide Evaluation Scheme.

On the other hand, spraying with Naled, or Dibrom, is the least effective insecticide for adult mosquitos and the most dangerous to humans, pollinators and other wildlife. See below.

Grant Campbell
Director of Wildlife Policy
South Florida Audubon Society
954 380 0482