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Global Invasive Species Team listserve digest #065
Thu Jul 13 2000 - 16:37:27 PDT
--CONTENTS--
1. Using Krenite (Washington)
2. Chinaberry and chinese privet (Texas)
3. Dianthus armeria--a new invader? (Colorado)
4. Controlling black locust (Pennsylvania)
5. A new weed geek (Nationwide)
6. Japanese knotweed (New York)
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1. Using Krenite (Washington)
From: Peter Dunwiddie (pdunwiddie(at)tnc.org)
I have used Krenite to control scrub oak species (Quercus ilicifolia) in a
grassy heathland in Massachusetts. It definitely affected other woody
species (Vaccinium, Myrica, Gaylussacia) when spray got on them, so we
took special care to avoid contact with non-target species. We found it
easiest to cut the oaks and apply Krenite to the resprouts the following
year with a backpack sprayer. Presumably a wick applicator would have
worked as well. We found control to be every good when applied in late
summer/early fall, but not so effective when applied later. This
herbicide acts as a bud suppressant, so there are no apparent effects
("brown-out") when applied. The plants simply don't leaf out the
following spring.
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2. Chinaberry and chinese privet (Texas)
From: Alan Saperstein (Alan_Saperstein(at)nps.gov)
I am working on an exotic plant removal plan and need biology and control
information on Chinaberry (Melia azedarach) and Chinese Privet (Ligustrum
sinense). Does anyone out there know of anyone who has or is doing
studies on these two plants?
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3. Dianthus armeria--a new invader? (Colorado)
From: Eric Lane (Eric.Lane(at)ag.state.co.us)
Do you have experience or knowledge about Dianthus armeria L.? We found a
population of it in Hollowell Park of Rocky Mountain National Park and it
appears to have invasive qualities to it. It is spreading along the edge
of a trail. It might be one of the other Dianthus species. It is my
understanding they are all exotic to this country coming from central or
southern Europe. Anything you know about this plant would be helpful. It
is my understanding this plant can be found in wildflower mixes. It might
be a plant to start thinking about as an invasive in Colorado.
Please respond to the list-serve or directly to Jeff Connor, Resource
Specialist for Rocky Mountain National Park, Jeff_Connor(at)nps.gov
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4. Controlling black locust (Pennsylvania)
From: Karen Budd (KBudd3030(at)aol.com)
Regarding the posting in digest #64 on Robinia pseudoacacia control...
Our experience has been that for cut stems you have to use a higher
percentage of herbicide, even as much as 50% for Robinia. If you use 20%
in either formulation, I think you will still have considerable
resprouting.
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5. A new weed geek (Nationwide)
From: Barry Rice (bamrice(at)ucdavis.edu)
The Wildland Invasive Species Team is happy to announce it has a new
staff member. Mandy Tu joins our team as a technical writer. Mandy is
completing her Plant Biology Ph.D. at the University of California, Davis.
She is working on our "Methods Handbook" and other projects. You can see
her picture at http://tncinvasives.ucdavis.edu/about.html
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6. Japanese knotweed (New York)
From: Michael Corey (mcorey(at)dos.state.ny.us)
I've been doing a fairly unstructured control study on pesky Japanese
knotweed (Polygonum cuspidatum) on a small site in upstate New York for
the past two growing seasons. I have gone beyond the yanking and cutting
methods of last year, including cutting/Round-up applications this year in
an effort to slow down the spread of several obnoxious patches. I suspect
it will be a healthy combination of cutting/herbicides that will
eventually weaken the patches to the point of removal.
This effort is ongoing, and may take several years; I will try to report
on the success/failure factor as it progresses. I would like to hear how
others are faring in their attempts to slow down or do in this knotweed.