Which management tool helps control submerged weeds without chemicals?

Water-level manipulation is an effective management tool used to control submerged weeds without relying on chemical herbicides. This method involves altering the water levels in a water body to create conditions that are less favorable for the growth of certain types of aquatic plants. By lowering the water levels, submerged weeds may be exposed to air, which can lead to their desiccation and eventual die-off. Conversely, raising water levels can sometimes smother or shade out certain types of weeds that require sunlight to thrive.

This approach works well in conjunction with the natural life cycles of aquatic plants, as some species may be less resilient to stress from fluctuating water levels. Additionally, water-level manipulation can enhance the natural ecosystem's balance by promoting the growth of desirable aquatic plants that can outcompete the submerged weeds in the long term.

Other options, such as biological control and mechanical harvesting, do provide alternatives for managing aquatic weeds, but they do involve different methods and considerations, such as the introduction of organisms that can consume specific plants or physically removing the weeds from the water body. Herbicide application, on the other hand, relies on chemicals to achieve control, which is not the focus of this particular question about non-chemical methods. Therefore, water-level manipulation stands out as a key