Which condition makes dust a preferred method?

Which condition makes dust a preferred method?

• A. It is a good alternative where moisture from a spray might cause damage.
• B. It is preferred when surfaces are extremely smooth.
• C. It is used only indoors due to humidity.
• D. It cannot be used on porous surfaces.

Answer: (A)

Dust is preferred when moisture from a spray could damage the materials being treated. Because dusts are dry powders, they don’t add liquid moisture, so they can be blown or brushed into cracks, voids, and other hidden spaces without risking warping, staining, or other moisture-related damage to surfaces like wood, wallpaper, or insulation. This makes dusts especially useful for pests that hide in concealed areas. The other scenarios—needing a liquid spray for smooth surfaces, humidity indoors, or limitations on porous surfaces—aren’t the key reason dust is chosen.

Dust is preferred when moisture from a spray could damage the materials being treated. Because dusts are dry powders, they don’t add liquid moisture, so they can be blown or brushed into cracks, voids, and other hidden spaces without risking warping, staining, or other moisture-related damage to surfaces like wood, wallpaper, or insulation. This makes dusts especially useful for pests that hide in concealed areas. The other scenarios—needing a liquid spray for smooth surfaces, humidity indoors, or limitations on porous surfaces—aren’t the key reason dust is chosen.