[MAIPC] herbicide travel distance in Japanese honeysuckle runners??

[Gover, Art]

Hi, William.

Another important element is seasonal timing.

Herbicide translocation is largely dependent upon flow in the plant conductive systems (there is some cell-to-cell movement). If you’re using a phloem-mobile herbicide (e.g. glyphosate, triclopyr, imazapyr, many others), the herbicide goes where the flow in the phloem is going. This early in the season, I would expect most woody plants are mobilizing stored carbohydrates to support new growth - moving towards the new foliage and stems, and secondary stem growth.

So, if your question is flow right now, I suspect it’s “backwards” for what you’re hoping to achieve. I limit herbicide applications to root-suckering woody species to summer.

Be well.

Art

Penn State Wildland Weed Management
116 ASI Building
University Park, PA  16802

(814) 863-9904
(814) 863-6139 FAX
http://plantscience.psu.edu/wildland

On Apr 13, 2021, at 07:36, Mark Frey <runcator at gmail.com<mailto:runcator at gmail.com>> wrote:

William

It really depends heavily on the herbicide used. Some herbicides travel in roots and some don't. Some herbicides travel far in soils and some don't. I don't know of research applicable to runners in particular but there are certainly many research projects on efficacy of herbicide X on species Y.

I just did a quick search in Google Scholar and found a few old resources for this species in particular:
Regehr, D. L., & Frey, D. R. (1988). Selective control of Japanese honeysuckle (Lonicera japonica). Weed Technology, 139-143.
Evans, J. E. (1984). Japanese honeysuckle (Lonicera japonica): a literature review of management practices. Natural Areas Journal, 4-10.
Nuzzo, V. (1997). Element stewardship abstract for Lonicera japonica. Nature Conservancy, Arlington, VA.<https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.invasive.org%2Fgist%2Fesadocs%2Fdocumnts%2Flonijap.pdf&data=04%7C01%7Caeg2%40psu.edu%7C86838cee68724fff2b1e08d8fe706ea4%7C7cf48d453ddb4389a9c1c115526eb52e%7C0%7C1%7C637539106139668875%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=fMBbd7OoGtzlfIHvpFvJFFSzveMZ4MUW%2FMowlriZySs%3D&reserved=0>

The Element Stewardship Abstracts are usually very useful for management. These documents were being produced back when TNC had a robust invasive species program and I have found them to be very useful for decades. Obviously, new research is not captured in these documents and some of the chemicals outlined in them and not ones many natural area managers would like to use if they could be avoided. But, they are a good place to start.

Mark

On Mon, Apr 12, 2021 at 10:00 PM Hamersky Business <william at skyhammer.com<mailto:william at skyhammer.com>> wrote:
Hi All,
New to the MAIPC list mail, but have been reducing invasives on my property for the 6 years I’ve lived in Virginia, and also belong to Blue Ridge PRISM.

I’ve been foliar spraying young J honeysuckle sprouts on the farm for a few days now and was wondering if anyone has info or knows of research on “just how far” the herbicide can travel along the runners before it is no longer effective? I’m guessing you all know that you can pull up one young sprout and have 3, 4, 5, or more runners attached to it, many with other “sproutlets” attached that will eventually root and create independent plants.  Incidentally, when I did occasionally pull up a sprout attached with runners, often their small “siblings" were invisible under the leaf litter.

So my question is: is there any research out there showing the efficacy of herbicide treatment on invasive runners? Is it worthwhile to herbicide treat these groups of plants, or just keep pulling and pulling (exposing lots of bare soil in the meantime and who knows how many other weed/invasive seeds!) and see how far I can go… hopefully not to the next county.

Thanks so much for any help/input/direction!

William Hamersky
Skyhammer
470 Taylors Gap Rd
Charlottesville, VA  22903

cel:  415. 516. 2560

william at skyhammer.com<mailto:william at skyhammer.com>

“The Ash, having fibres tenacious and strong,
Teaches me firm resistance, to battle with wrong."
      Helen O. Hoyt


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