The OSU Research Forests plan to spray McDonald-Dunn harvest units as early as Monday, July 24, 2023.  The exact dates are dependent on weather conditions and contractor availability.

We will spray all treatment units on the McDonald and Dunn Forests using backpack sprayers.  Spray targets vegetation only (not road or trail surfaces).

During application, staff will be at roads and official trails leading into spray areas to keep people away.  Please see the on-site signs for re-entry times associated with each chemical.

Signs will have the date of application, name of the chemical used, and the industrial re-entry interval posted at entry points into each treatment area. Signs will remain in place for one week.

The purpose of herbicide applications is to control the growth of non-native plant species and competing vegetation in recently harvested areas. All herbicide applications are conducted in compliance with State and Federal regulations and under a licensed pesticide applicator's supervision.   

Click here for a map of the spray locations throughout the McDonald-Dunn Forests.

SPECIAL NOTE:  All of Peavy Arboretum will be CLOSED during the herbicide treatment. This closure will likely last one day. We will send out a Forest Update when the closure begins and when the closure is lifted.