What is Source Reduction?

• A. A trap that targets egg-laying mosquitoes.
• B. A surveillance method counting landings.
• C. Use of natural predators or pathogens (e.g., mosquitofish, Bti) to control mosquitoes.
• D. Elimination or modification of mosquito breeding sites.

Answer: (D)

Source reduction means removing or altering places where mosquitoes can breed so they can’t reproduce. This directly cuts the mosquito population by stopping larvae before they become adults. Examples include eliminating standing water in containers, tires, bird baths, and plant saucers; fixing leaky pipes and drains; cleaning out clogged gutters; and properly managing water in landscapes.

That’s why the description about eliminating or modifying breeding sites is the best fit. By targeting the places mosquitoes need to lay eggs and develop, you reduce production at the source and often lessen the need for pesticides. Other options describe traps for monitoring, counting bites or landings, or using predators or pathogens—these are important parts of mosquito management but do not accomplish source reduction.