How do tracking powders function in pest control?

Tracking powders function in pest control primarily by sticking to the fur of rodents when they come into contact with it. This is significant because, as rodents groom themselves to maintain cleanliness, they ingest the powder. The active ingredients in the tracking powder are typically anticoagulants or other toxic substances that lead to the rodent's death after consumption.

The mode of action relies on the rodent's natural behavior, as they frequently clean their fur. Because tracking powders are fine and designed to adhere effectively, they ensure that the rodent carries the substance back to its nesting area, which may also expose other rodents. This method is effective for controlling rodent populations without needing traps or bait stations in every location, providing a subtle yet potent pest management strategy.

The other provided options do not accurately represent how tracking powders work in pest control. For example, creating an unpleasant odor, repelling rodents, or affecting their vision is not how tracking powders function. Instead, their efficacy lies in their ability to be ingested following adherence to the rodent's fur through grooming habits.