East Indian hygrophila

East Indian hygrophila (Hygrophila polysperma) is a perennial herbaceous plant belonging to the Acanthaceae family. In an agronomic context, it is classified as a highly invasive aquatic and semi-aquatic weed known for its rapid growth rate and ability to colonize diverse water environments.

This species is predominantly found in irrigation systems, drainage canals, and rice paddies. Due to its vigorous vegetative propagation, it thrives in stagnant or slow-moving waters, often causing significant disruptions to agricultural water management and transport systems.

The biology of this weed is defined by its extreme plasticity. It can grow submersed or emersed, with every small stem fragment capable of regenerating into a new plant. This feature makes it exceptionally difficult to eradicate once it has become established in a waterway or irrigation network.

The economic impact of Hygrophila polysperma is largely due to its ability to form dense mats that impede water flow, reduce water quality, and clog irrigation infrastructure. This disruption leads to flooding risks, reduced crop yields in paddies, and increased maintenance costs for water distribution systems.

Control measures require a multi-faceted approach:

• Frequent manual or mechanical harvesting, ensuring all plant material is removed from the water.
• Water level management to dry out or expose shore-dwelling populations of the weed.
• Application of specialized aquatic herbicides approved for use in irrigation or drainage canals, following strict ecological protocols.
• Strict phytosanitary practices to prevent the introduction of plant fragments into new drainage basins.