[MAIPC] Phellodendron amurense Treatment Options

[Sitch, Kelly]

Hello Everyone,

This spring a significant infestation of Phellodendron amurense (Amur corktree) was found in Michaux State Forest (Franklin County, PA near Chambersburg).  We expect that it originated from individuals planted at the nearby Penn State Mont Alto Campus and has been present on the State Forest for some time.  They are spread out over approximately 100 acres, but very patchy.  Stems range in size from 1-2 feet tall and less than 1" DBH to larger mid-canopy size individuals in the 6-10" DBH range.

This is a novel invasive species on the State Forest.  As such, we don't have a lot of experience with treatment.  Our current thinking is to apply a basal application of Pathfinder II to all stems less than 4" DBH.  We are considering hack and squirt treatments of 50% Glyphomate 41 to stems greater than 4" DBH.  Our concern is the corky/spongy nature of the bark as the stems mature could be a problem for basal treatments, thus the hack and squirt at larger diameters.

I wanted to reach out to this group to see if anyone had any experience with effective treatments for Phellodendron or could speak to the relative efficacy of various herbicides/treatments.  We plan on doing some experimenting ourselves with various treatments this field season, but would like to have our first control attempt to be as effective as possible.

Thank you

Kelly Sitch

Kelly Sitch | Botanist
Pennsylvania Department of Conservation & Natural Resources
Bureau of Forestry | Ecological Services Section
PO Box 8552, 400 Market St, Harrisburg, PA 17105-8552
Phone: 717.425.5370 | Fax: 717.772.0271
www.dcnr.state.pa.us<http://www.dcnr.state.pa.us/>

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