Final answer:
Glue boards or traps used as part of a treatment maintenance program for German cockroaches can provide information about the effectiveness of reducing the cockroach population.
Step-by-step explanation:
Glue boards or traps can provide valuable information as part of an ongoing treatment maintenance program for German cockroaches. One of the main pieces of information that can be gained is the monitoring evidence of population reduction. In other words, glue boards can help determine if the treatment is effectively reducing the cockroach population. By examining the number of cockroaches caught on the glue boards over time, pest control professionals can assess the success of the treatment program and make adjustments if needed.