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The Global Invasive Species Team | |
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Global Invasive Species Team listserve digest #056 Mon Mar 13 2000 - 16:37:10 PST --CONTENTS-- 1. Purple loosestrife: pull or not pull? (Oregon) 2. Bogs and purple loosestrife (New York) 3. Swallowort control (New York) 4. USFWS seeks input on invasive animal prohibitions (National) 5. Conference: Phragmites australis in the Mid-Atlantic Region (National) --------------------------------------- 1. Purple loosestrife: pull or not pull? (Oregon) From: Debbie Pickering (dpickering(at)tnc.org) This is a quick response to the comment in the last listserve digest that purple loosestrife (Lythrum salicaria) should not be pulled. We have found using a tool to pry loosestrife plants out of the ground (with minimum soil disturbance) to be very effective. Plants pulled in previous years did not resprout. These are mostly individual plants in an infestation that was just starting to get established in muddy banks. I think it is important to make a site specific evaluation before ruling out possible control measures based on others' experiences. --------------------------------------- 2. Bogs and purple loosestrife (New York) From: Laurel Carroll (laurelc(at)concentric.net) Has anyone observed the behavior of purple loosestrife (Lythrum salicaria) in bogs? We (Adirondack TNC staff and volunteers) were wondering if it was as perniciously invasive in this highly acidic environment as it is in other types of wetlands. --------------------------------------- 3. Swallowort control (New York) From: Michael S. Scheibel (mscheibel(at)tnc.org) On the Mashomack Preserve, Shelter Island, we treated a 0.7 acre infestation of black swallowort (Cynanchum rossicum) with Round-up Pro (41% glyphosate) during the 1999 growing season. The site is within an open canopy oak-hickory woodland with a dense vine layer dominated by catbrier (Smilax) and Cynanchum reaching to ten feet. Prior land use included livestock grazing during the nineteenth century. In late April the site was mowed using a tractor pulled brush-hog to facilitate access and reduce the volume of plant material. By late May, Cynanchum accounted for 70% of total cover, forming a monoculture of plants nearly two feet high as they entered early flowering stage. On June 1, 125 gals. of 3% solution was applied using a truck mounted 100 gal. commercial sprayer. Two weeks later we noted yellowish-brown spots, withering and considerable leaf drop. Second and third applications of about 10 gals. each were administered to re-sprouts and seedlings on 6/18 and 8/5. Cynanchum accounted for approximately 5% total cover in late July. The site will be monitored during Spring 2000, and treated accordingly. --------------------------------------- 4. USFWS seeks input on invasive animal prohibitions (National) From: Barry Rice (bamrice(at)ucdavis.edu) The US Fish & Wildlife Service is requesting suggestions on which animals should be added to their lists of "injurious" animals. "Injurious" animals cannot be imported to the USA except in limited situations. If you are interested in learning more about this request, or how you can make a useful contribution to this discussion (by 7 June 2000), look at the additional details I posted on the web at: http://tncweeds.ucdavis.edu/news/031300.html --------------------------------------- 5. Conference: Phragmites australis in the Mid-Atlantic Region (National) From: Jill Rooth (jill(at)hpl.umces.edu) (This conference, 17 April 2000, 9AM-5PM, will take place at the University of Maryland at Princess Anne, MD. For more information see: http://tncweeds.ucdavis.edu/meetings.html or email Jill Rooth.) The purpose of this workshop is to present the latest research on Phragmites australis to public and private land managers in the Mid-Atlantic region. Presenters include leading researchers who are studying ecosystem effects of Phragmites, its biogeographic history in the region, outcomes of removal, and other topics. This workshop is designed to provide information to help make the best decisions regarding the status of Phragmites on the property you manage. This is primarily geared towards the management community but has a large scientific aspect. |
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