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Buckthorn: What you can do! - Invasive species: Minnesota DNR Page 3 of 4 - , . flags can also help mark cut stumps. When - - - --�� buckthorn is cut, the stumps are easily covered and X Hand tools forcutting buckthorn lost under cut brush. Chemical treatment in the winter: Buckthorn can be treated throughout the fall and winter. Follow herbicide label instructions regarding temperatures at which the herbicide can be applied. Water- soluble herbicides like gyphosate (Roundup, Rodeo, etc.) or triclopyr amine (Garlon 3A, Brush-B-Gone, etc.) can be applied to cut stumps when the temperature is above freezing (32 deg. F). Oil-based Hand tools for cutting buckthorn. products of triclopyr ester (Garlon 4, Pathfnder II) can be applied when the temperature is below freezing (below 32 deg. F). For basal stem treatment, a method that applies chemical through the bark, low volume spray applications can be made with Garlon 4 and similar oil-based products. This application method uses Triclopyr ester miXed with an oil diluent (i.e. Bark Oil Blue, kerosene or diesel oil) applied directly to the bark of buckthorn from the root collar up about 12-18 inches. This treatment works best on stems less than 2-3 inches in diameter. An ultra low volume spray wand should be used to minimize herbicide use and reduce the potential for non-target injury. Buckthorn treated in this fashion can be left standing or cut at a later date. Note: Buckthorn seeds in the soil can remain viable for up to five years. Follow-up control of seedlings — - - - that emerge after initial control efforts is important X Applying chemicals to cut buckthorn on all sites. With no follow-up control, buckthorn will come back. Fire offers a long-term management option in grassland or savanna cover-types. Burning will need to be done every two to three years. If burning is not an option, a follow up treatment of the seedlings (pulling or spraying) is needed. After buckthorn control, many sites may require replanting of desirable tree, shrub, and herbaceous species. A resource that may help you to find the Applying chemicals to cut buckthorn. right plants for your location is a multimedia CD program called Restore Your Shore. Herbicides to Control Buckthorn Trade Name Chemical Concentration Use Name Ortho Brush-B- Triclopyr premixed at 8% Cut stump Gon amine mhtmL•file://C:\Users\cmattson\AppData\Local\Microsoft\Windows\Temporary Internet ... 12/21/2011