Which of the following is a chemical method for rat flea control?

• A. Sealing Building with Fine Screens
• B. Snap Traps for Rodents
• C. Remove Garbage
• D. Apply Insecticide Dust in Rodent Burrows

Answer: (D)

Using a chemical method means applying a pesticide to kill pests or reduce their populations, rather than relying on traps or barriers. Fleas that feed on rats spend a lot of time in the rats’ tunnels and burrows, so applying an insecticide dust directly into those burrows targets the fleas where they live and breed. This helps kill fleas at multiple life stages and disrupts their life cycle, reducing the overall flea population.

The other approaches are non-chemical: sealing a building with fine screens relies on preventing entry, traps physically remove rodents, and removing garbage lowers attractants through sanitation. None of these involve using a pesticide, so they aren’t chemical methods.