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Buckthorn: What you can do! - Invasive species: Minnesota DNR Page 2 of 4 Most of these invasive plant factsheets are created from the booklet Minnesota invasive non-native terrestrial plants, an identification guide for resource managers. Check the additional resources and herbicides table for more information. ORONO COPY What you can do to control buckthorn! Controlling seedlings or small buckthorn plants X Removing small buckthorn with hand tools For individual plants If less than 3/8 inch in diameter, remove by hand. Small seedlings can be pulled and will not re-sprout. If greater than 3/8 inch, use a hand tool that pulls the shrub out, such as a "Weed Wrench" or "Root Talon". The "Weed Wrench" comes in four different sizes and will remove buckthorn stems up to 2.5 inches in diameter. Removing by hand is easier if the soil is moist. Before you pull or dig buckthorn out of your soil, Contact Gopher State One Call (1- 800-252-1166) to ensure there are no buried utilities in the area. If pulling individual plants is impractical Spray foliage of short buckthorn or seedlings with a herbicide. Glyphosate (one brand name is Roundup) will kill all actively Removing small buckthorn growing vegetation on which it is sprayed. Triclopyr will kill with hand tools. broadleaf plants and will not harm grasses when applied properly. Controlling large buckthorn � Buckthorn plants that are two inches in diameter or larger, are best controlled by cutting the stem at the soil surface and then cover or treat the stump to prevent re-sprouting. This can be effectively done with hand tools (for a few plants), chain saws or brush cutters. If only cutting a few stumps they can be covered with a tin can or black plastic to prevent re-sprouting. Otherwise, stumps should be treated immediately after cutting (within 2 hours) with a herbicide containing Triclopyr(such as Ortho Brush -B-Gon or Garlon 3A or 4) or Glyphosate (Roundup) to prevent re-sprouting. The best time to cut and chemically treat the stumps is in late summer and throughout the fall. Avoid treating buckthorn in May and June when the tree is putting out leaves as the herbicide will be less effective at this time then during the rest of the year. Herbicides can be applied to cut stumps with a paint-brush, wick applicator or a low volume sprayer. When using water-soluble herbicide products like Ortho Brush-B-Gon, Garlon 3A, or any of the Glyphosate products, treat only the cut surface. When using oil-based products like Garlon 4 or Pathfinder II, treat the cut surface and the remaining bark to the ground line. In cases where more than a few plants are treated, add an indicator dye (available where pesticides are sold) to the herbicide to mark cut stumps you have sprayed. Colored mhtml:file://C:\Users\cmattson\AppData\Local\Microsoft\Windows\Temporary Internet ... 12/21/2011