No two mosquito habitats are alike - and neither are the ways you treat them. That's why there are a variety of Altosid formulations. Each provides the extended control you need in easy-to-access or difficult-to-treat areas. Altosid formulations are labeled for use in known fish habitats. That means they prevent the emergence of breeding, biting adults without upsetting the food chain or impacting non-target species. So you're ensured consistent control - and peace of mind.


Unlike conventional pesticides, each Altosid® formulation contains (S)-methoprene, an insect growth regulator (IGR) that stops mosquitoes from becoming breeding, biting adults. (S)-Methoprene is target-specific and will not affect fish, waterfowl, mammals or beneficial predatory insects. As a result, you can feel comfortable using Altosid® in your district's most sensitive areas. And you'll feel even better about the effective, long-term control you'll get in return.

Best of all, the (S)-methoprene in Altosid® products has an excellent toxicity profile. So you get complete control without additional worries. Furthermore, residual larvicidal activity reduces adult populations and the need for adulticides.

Altosid® XR-Briquets White

Habitats that need the most control are often the most undesirable and difficult to treat. So you'll be pleased to learn that a single application of Altosid® XR-Briquets offers up to 150 days of control.

Like Altosid® 30-Day Briquets, XR Briquets require no expensive application equipment, and can be used for pre-treatment before the wet season. That means you're better able to treat hard-to-access or out-lying areas, and can eliminate the additional costs associated with travel and multiple re-treatments.

Altosid® XR Briquets are available in an "ingot" shape for easier application. This "ingot" shape (3 1/8" L x 1" H x 1 1/8" W) is narrower and longer than the existing "cork" shape, allowing the product to fit through virtually any storm drain or sewer without the need for lifting the grate. For even the tightest fits, Altosid® XR Briquets are also available “slim” version of the ingot shape. Now, Altosid® XR Briquets make application easier and still deliver season-long control of mosquito larvae for up to 150 days.


  • Slow release control for up to 150 days
  • Multiple shapes for easy applications
  • Extended shelf life
  • Easy-to-use
Altosid® XR-Briquets