Laser weeding: opportunities and challenges for couch grass (Elymus repens (L.) Gould) control

Area of Science:

• Agricultural Science
• Robotics
• Plant Science

Background:

• Traditional weed control relies heavily on herbicides and soil tillage, raising environmental concerns.
• Laser weeding technology is emerging as a sustainable alternative, utilizing AI and robotics for precision application.
• Perennial weeds pose a challenge due to their ability to regrow from underground structures after aerial shoot destruction.

Purpose of the Study:

• To investigate the efficacy of laser weeding in controlling the aggressive perennial weed Elymus repens.
• To determine the optimal conditions for laser treatment to prevent regrowth from rhizome fragments.

Main Methods:

• Elymus repens rhizomes were fragmented and treated with varying laser energy dosages.
• Plant regrowth was monitored after laser application.
• Treatment efficacy was assessed based on plant survival and regrowth, with a focus on the 3-leaf stage.

Main Results:

• Laser treatment effectively killed Elymus repens plants, even from small rhizome fragments, and inhibited regrowth.
• Minimal laser energy dosages were sufficient to achieve weed control.
• Highest efficacy was observed when treating plants with small rhizomes at the 3-leaf stage.

Conclusions:

• Laser weeding is a viable and eco-friendly method for controlling perennial weeds like Elymus repens.
• Targeting young plants, particularly at the 3-leaf stage, enhances laser weeding efficacy.
• Further research into optimizing laser parameters and application strategies can advance sustainable agriculture.