Officials with the U.S. Forest Service say aerial herbicide spraying in the Bitterroot National Forest will take place for two or three days in a time period between Monday and July 8. 

Officials say the spraying is being done in the Darby and Sula ranger districts to kill invasive species and bolster native plants that offer good winter forage for animals.

Sula District Ranger Gil Gale says that the precise times of the spraying will depend on weather.

Gale says the best time to apply herbicide to invasive species is when the plants are actively growing.

Gale says signs on Forest Service roads will warn visitors of the spraying.

Associated Press