Curly-leaf pondweed

Curly-leaf pondweed (Potamogeton crispus) is a perennial aquatic plant belonging to the Potamogetonaceae family. It is a submerged macrophyte that is well-known for its ability to colonize various freshwater habitats, including ponds, lakes, and slowly moving streams or irrigation channels.

This weed is particularly troublesome in irrigation and drainage infrastructure, as well as in rice paddies. In these environments, it grows in thick mats that interfere with water flow and compete directly with crops for nutrients and light. Its presence can significantly alter the local aquatic ecosystem dynamics.

The plant's biology is marked by a unique growth cycle. It actively grows during the cool-water months of autumn and spring, while it tends to die back during the peak of summer heat. Before dying, it produces specialized vegetative buds called turions, which persist in the substrate and allow for rapid colonization in the following season.

The economic impact of curly-leaf pondweed is significant, especially regarding hydraulic efficiency. Dense infestations block irrigation gates and drainage pipes, leading to water stagnation and sedimentation. In paddy fields, it suppresses the development of rice plants, forcing producers to allocate additional resources for manual or mechanical removal.

Management strategies focus on both preventive and active control methods.

• Mechanical control: dredging and physical removal of the plant mass.
• Drawdown: lowering water levels to dry out the beds.
• Chemical control: using aquatic-approved herbicides that target submerged vegetation while minimizing impact on non-target organisms.