Which of the following is a common method of monitoring flea populations?

Vacuum sampling is a well-accepted method for monitoring flea populations because it allows for the collection of live and dead fleas from specific areas, such as carpets or pet bedding. By vacuuming these areas, pest control professionals can identify the presence and abundance of fleas. This method not only captures adult fleas but can also collect debris that could indicate flea egg and larval presence. This information is crucial for making informed decisions about whether control measures are needed and what type might be most effective.

In contrast, color traps and light traps, while useful for monitoring certain types of pests, are not typically effective for fleas. Fleas do not respond effectively to these traps, as they are not attracted to visual stimuli in the same way some other insects are. Spraying insecticide does not serve as a monitoring technique; it is a method of control. While effective for reducing flea populations, it does not provide data about population levels or trends in the environment. Vacuums directly sample the area and provide tangible results that can inform and guide management strategies thereafter.