When are long-residual pesticides preferred?

• A. In homes with children.
• B. In constant pest problems, livestock buildings, termite control.
• C. In variable weather conditions.
• D. In areas with heavy rainfall only.

Answer: (B)

Long-residual pesticides stay active longer after application, so they’re especially useful when pests are a constant problem and you want to reduce how often you need to reapply. This is exactly what you see in places like livestock buildings, termite control, and other situations with ongoing pest pressure—where a durable, long-lasting barrier or extended protection makes sense and access for frequent treatments is limited.

In homes with children, safety and exposure concerns often mean using products with shorter residuals or applying long-residual products with strict safety practices and restricted-entry intervals. Weather plays a big role too: variable conditions can affect how long a residue lasts, and heavy rainfall can wash residues away, diminishing the benefit of a long-lasting product. So the best fit for preferring long-residual pesticides is situations with persistent pest problems, such as livestock facilities and termite control.