The Siuslaw currently has approximately 57,000 acres infested with non-native and invasive terrestrial plant species. The infested areas are likely underestimated due to incomplete inventories and the ongoing spread of invasive plants.

Chemical Methods… one method mentioned in the proposal…

  • Hack and squirt or frill
  • Injection
  • Cut and daub
  • Basal Bark
  • Wiping onto foliage
  • Directed foliar spray
  • Spot spray
  • Drone application
Three Forest Service employees wearing hard hats use a backpack sprayer to spray invasive weeds.
Blue dye is mixed with herbicide to trace what areas have been sprayed when using backpack sprayers to direct foliar spray. 

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