Which pesticide is noted for use as a perimeter spray?

Demand CS is noted for its effectiveness as a perimeter spray primarily due to its formulation and mode of action. It contains the active ingredient lambda-cyhalothrin, which is a pyrethroid insecticide. Demand CS provides long-lasting residual control, making it suitable for creating a barrier around structures to prevent insects from entering.

When applied as a perimeter spray, Demand CS works by attaching to surfaces and remaining effective over time, which deters pests from crossing the treated area. This is particularly beneficial in controlling a wide range of pests, including ants, spiders, and many other insects that might enter homes or buildings.

The other pesticide types listed do not serve the same purpose in perimeter applications. Anticoagulants are primarily used as rodenticides and are not suitable for perimeter sprays against insects. Fumigants are gases used to treat an area by penetrating materials and are typically employed for structural pest control rather than as a barrier treatment. Aerosol formulations may provide quick knockdown of pests but are generally not used for long-lasting perimeter barriers in the same way that Demand CS is designed for.