• Introduction
• Evaluating the potential for natural recovery
  • Burn severity & plant survival
  • Noxious weed cover & survival
• Revegetating with competitive plants
  • When revegetation is necessary
  • Formulating a Seed Mix
  • Things to consider
• Establishing competitive plants
• Managing competitive plants
• Integrated Weed Management
• Preventing noxious weeds
• Eradicating small weed patches
• Managing large weed infestations
  • Mechanical control
  • Chemical control
    • Timing & placement
  • Cultural control
  • Biological control
• Monitoring & Evaluation
• Developing a burned-area IWM plan
• Summary
• Sources and Credits
• Additional Resources
• Interactive Exercises

Rangeland Weed Management - Managing large infestations through chemical control

Chemical Control

Timing the Application of Herbicides

Timing the application of residual and non-residual herbicides is important.

Timing the Application of Herbicides

Suggested placement of herbicides

The size of an infestation determines how herbicides can best be used. An infestation moderate in size might receive infestation-wide treatment. If necessary, revegetation could follow as a fall-dormant reseeding. By contrast, an infestation very large in size - too large for infestation-wide control - might receive perimeter treatment, a contain- ment approach designed to concentrate efforts on the advancing edge of the infestation. Because containment programs are designed to limit infestation spread, such programs typically require a long-term commitment to herbicide treatments. Containing infestations that are too large to eradicate is cost-effective because it protects adjacent uninfested areas and thereby enhances the chances for success of large-scale management programs.