Final answer:
Spot treatment is the highly effective application procedure for treating an interior carpet for fleas.
Step-by-step explanation:
The highly effective application procedure for treating an interior carpet for fleas is spot treatment. Spot treatment involves applying an insecticide directly to the areas where fleas are present or suspected to be present, such as cracks, crevices, and other hiding spots. This allows for targeted treatment and reduces the risk of exposure to humans and pets.
Barrier treatment, on the other hand, involves creating a perimeter of insecticide around the carpet or treating the entire carpet. Dust treatment consists of applying an insecticidal dust to the carpet. Low pressure fan spray involves misting the carpet with a low-pressure spray. While these methods may be effective to some extent, spot treatment is considered the most efficient way to treat fleas in an interior carpet.