What type of pesticide solution is effective in filling hard-to-reach cavities in walls?

Foam solutions are particularly effective for filling hard-to-reach cavities in walls because of their ability to expand and fill voids. When applied, foam pesticide can penetrate and reach areas that might be otherwise inaccessible to liquid or solid formulations. The expansion of the foam allows it to conform to the shape of the cavity, ensuring that it adheres to surfaces and provides thorough coverage where pests may hide or nest.

In contrast, liquid solutions might run or drip, failing to remain in place in such cavities. Granular solutions are typically used on surfaces and do not effectively deliver pesticide into hard-to-reach spaces. Dust solutions, while good for reaching some hidden spots, may not provide the same level of volume and adherence that foam can offer in challenging environments. Thus, foam solutions are the optimal choice for targeting pests in hidden areas within wall cavities.