Pyriproxyfen

What is it and how does it work?

Pyriproxyfen mimics an insect hormone, disrupting maturation and reproduction. It is rarely directly toxic to adult insects, so products often combine it with an adulticide. NPIC: Pyriproxyfen fact sheet explains the underlying ingredient or an example product. An active ingredient is only one part of the finished formulation.

What forms and pests are covered?

Example product forms include liquid, spray, aerosol, granules, dust / powder, granular bait. Example target groups include fleas, cockroaches, fire ants, mosquito larvae, carpet beetles. These are drawn from different labels and references, not a claim that every product treats every listed pest. Check the label for the exact species, life stage and use site.

How is it used in pest management?

Examples span flea formulations, indoor insect products and certain ant or aquatic larval uses. Permitted targets and sites belong to the individual product.

Identify the pest, correct food or moisture problems, close entry points where appropriate, and monitor the result. See our integrated pest management guide. A recurring infestation calls for reassessment, not an automatic stronger dose.

What cautions matter?

NPIC warns that young stages of non-target insects may be sensitive and that aquatic effects matter. Do not use a household formulation in water or on pets without that exact label.

Prevent children and pets from contacting stored or applied products. Follow the exact label for protective equipment, ventilation, return intervals, storage and disposal. Do not transfer a pesticide into a drink or food container. Read the label safety guide before selecting a product.

What are its limits?

A combination spray's adult kill does not come from growth regulation alone. Product effectiveness cannot be inferred just from the presence of pyriproxyfen.

The same ingredient in a garden, structural, aquatic or pet product does not make those products interchangeable. This page does not verify current Texas registration, recommend a brand or provide dilution rates, placement quantities or a treatment prescription. Manufacturer sources describe example products, not every formulation.

Where should you check before using a product?

Use the label attached to the exact product you intend to use. Confirm its target pest, permitted site and application method. Check any professional-use restrictions and applicable Texas rules. NPIC explains how to read a pesticide label. Older fact sheets remain useful background, but the current product label takes priority.

For suspected human exposure, follow the label's first-aid instructions and contact Poison Control at 800-222-1222. Call 911 for severe symptoms. For suspected pet exposure, contact a veterinarian immediately.

This field guide is educational and does not offer treatment bookings.