Ribbon-leaf pondweed

Ribbon-leaf pondweed (Potamogeton epihydrus) belongs to the Potamogetonaceae family. This perennial aquatic herb is categorized as a submerged and floating-leaved macrophyte. It is considered an invasive or problematic weed in various artificial aquatic environments, primarily due to its aggressive growth patterns and rapid colonizing capacity.

This species is widely distributed in North American water bodies, often invading irrigation canals, drainage ditches, and flooded agricultural fields like rice paddies. Its presence in agricultural infrastructure is highly detrimental, as it interferes with water flow regulation, leading to sediment accumulation and restricted water delivery to crops.

The biology of Potamogeton epihydrus is marked by heterophylly, possessing both narrow submersed leaves and broader, floating leaves. It reproduces effectively through rhizomes and stem fragments, making it persistent even after mechanical disturbances. Its ability to thrive in diverse water depths and moderate currents makes it a resilient competitor in aquatic ecosystems.

The economic impact of this weed is significant. In irrigation channels, it forms dense mats that obstruct valves and screens, increasing operational costs for maintenance and cleaning. In cultivated fields, it competes for space and nutrients, creates microclimates that hinder crop development, and can significantly decrease yields if left unmanaged.

Control measures require a multi-faceted approach:

• Mechanical removal of biomass using aquatic weed harvesters.
• Water level management to prevent photosynthesis in submerged stages.
• Application of approved aquatic-labeled herbicides during the peak growth period.
• Regular dredging and maintenance of irrigation channels to remove overwintering rhizomes.