What type of trap can be used as a nonchemical tool against cockroaches?

Using sticky traps and glue boards is an effective nonchemical method for managing cockroach populations. These traps work by utilizing a strong adhesive surface that captures cockroaches when they come into contact with it. This not only helps in monitoring the level of infestation but also aids in reducing their numbers without the use of chemicals that may pose risks to humans and pets.

Sticky traps are particularly useful because they can be placed in various locations where cockroaches are likely to travel, such as along walls, behind appliances, and in dark corners. By doing so, they provide a visual indicator of cockroach activity and can help in determining the most infested areas, allowing for more targeted interventions.

The other choices, while potentially useful in pest management, do not qualify as nonchemical tools. Light traps often attract a variety of insects and are more suited for flying pests, whereas live traps are generally not practical for cockroaches due to their elusive behavior and tendency to return to hiding places. Insecticide bait stations involve the use of chemical attractants and poisons, which contradicts the nonchemical requirement of the question. Thus, sticky traps and glue boards stand out as the appropriate choice for managing cockroaches without chemicals.