What is a primary reason roller pumps are not commonly used in aquatic weed treatment?

Roller pumps are primarily limited in their use for aquatic weed treatment because they do not generate the high pressures needed for effective spraying. In many aquatic environments, achieving sufficient pressure is crucial for ensuring proper coverage and penetration of herbicides onto the targeted weeds. The efficiency and effectiveness of spraying operations heavily depend on the ability to achieve consistent and adequate pressure.

While other options might present challenges in specific contexts, the critical function of pressure in herbicide application makes this limitation of roller pumps particularly significant for aquatic pest management. Therefore, their inability to meet the pressure requirements makes them less favorable for such treatments compared to other pump types that can generate the necessary force for thorough application.