BENGALURU: Karnataka’s forests are grappling with a significant challenge as 40-50% of the state’s forested areas are now infested with invasive weeds. This issue poses a severe threat to the health of the ecosystem and the management of these forests.

Key Issues:

  • Weed Infestation: The primary invasive weeds include Lantana camara, Eupatorium perfoliatum, Senna occidentalis, Parthenium hysterophorus, and Mikania micrantha. Aquatic weeds like water hyacinth and Salvinia molesta also contribute to the problem.
  • Resistance to Weedicides: Some weeds, notably Mikania micrantha, have developed resistance to common weedicides, making chemical control methods ineffective and raising concerns about their toxicity.
  • Ecological Impact: The increased moisture content in forests, due to stringent laws and afforestation, has led to a surge in weed growth, complicating management efforts.

Current Efforts and Challenges:

  • Need for Ecological Study: Additional Principal Chief Conservator of Forests (Wildlife) Subhash B Malkhade emphasizes the need for an ecological study to develop effective solutions.
  • Utilization of Weeds: Officials are exploring innovative uses for the weeds. Options being discussed include generating electricity from Lantana camara and using weeds for making briquettes and other products. However, challenges include the difficulty of accessing infested areas and the need for funding and efficient procurement methods.

Future Plans:

  • Research and Development: Collaborations are underway with institutions like the Indian Institute of Forest Management to develop economic models for using weeds. Discussions are also ongoing about the potential for energy generation and other applications.

This growing problem underscores the urgency of finding sustainable solutions to manage invasive weeds and protect Karnataka’s vital forest ecosystems.

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