Which type of pesticide application is best for controlling brown recluse and yellow house spiders?

Residual crack and crevice applications are particularly effective for controlling brown recluse and yellow house spiders because these pests often hide in tight spaces and crevices around homes. The residual nature of this application means that the pesticide remains active over an extended period, allowing it to effectively target spiders that come into contact with treated surfaces later on.

When using crack and crevice treatments, the pesticide can be applied directly into the small crevices and gaps where spiders tend to dwell, such as in baseboards, under appliances, and in corners. This method minimizes exposure to the pesticide and helps ensure that the spiders are directly affected when they emerge from their hiding spots.

Other methods, like fogging, may not adequately penetrate these hiding spots or provide sufficient residual effects, while lawn sprays might target outdoor pests rather than those that live indoors. Spatial treatments, although useful in some scenarios, may not be as precise or effective against spiders that prefer secluded areas. Thus, residual crack and crevice applications stand out as the optimal choice for controlling these specific spider species.