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The Global Invasive Species Team | |
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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) --------------------------------------- 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. --------------------------------------- 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? --------------------------------------- 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 --------------------------------------- 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. --------------------------------------- 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://tncweeds.ucdavis.edu/about.html --------------------------------------- 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. |
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