Insect growth regulators (IGRS) mimic natural juvenile hormones in young insects and disrupt insects growth and other life processes. It is absorbed by the cuticle (larval exoskeleton) or ingested. The only IGRS products registered for use in Florida are methoprene, pyriproxyfen, and diflubenzuron. We use an EPA-registered and approved product called Altosid. 

The strain Bacillus thuringiensis israelensis (Bt or Bti) for short, is a bacteria found in soil. This bacteria, when consumed by mosquito larvae, releases microscopic spores into the gut. These spores create a toxin which causes the mosquito larvae to stop eating which makes them starve and die. 

Bti is only effective against larvae and must be applied to water, but is fast-acting and environmentally friendly. The bacteria is safe for plants, animals, and humans when used as directed. Mosquito Management regularly treats standing water using Bti, which helps to reduce adulticiding chemical use. Homeowners can purchase Bti at most home improvement retailers for regular mosquito prevention around their homes.  

Oils and films (monomolecular surface films) are used to target the final immature stage of the mosquito life-cycle before they can become biting adults: pupa. 

Mineral oils formulated to dissolve quickly can be used to suffocate pupa when they try to breathe along the water surface.

Caution is advised that for plant-dwelling mosquito larvae and pupae control, some mineral oils may damage plant material. Following the label, test a mineral oil before directly applying into or near aquatic plants. 

Mosquitofish are a natural predator of mosquito larvae and pupae. These little fish are a native, natural form of larval control that, yes, count as a larvicide!