Which traps are primarily used for monitoring cockroach activity?

Sticky traps are primarily used for monitoring cockroach activity because they are specifically designed to capture crawling insects like cockroaches. When placed in areas where cockroaches are likely to travel, these traps help pest control professionals and researchers identify the presence and level of infestation. The adhesive surface effectively immobilizes the cockroaches upon contact, allowing for easy monitoring of their population and activity levels.

Pheromone traps are utilized to attract insects based on their chemical signals but are more commonly used with specific species that respond to those pheromones, and they may not be as effective for cockroaches. Light traps are typically effective for flying insects, such as moths or flies, rather than crawling pests like cockroaches. This makes sticky traps the most reliable option among the choices for monitoring cockroach activity.