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Previous digest Subsequent digest Global Invasive Species Team listserve digest #148
Fri Sep 08 2006 - 16:05:58 PDT
Contents 1. Didymosphenia video (Global, Planet Earth) 2. Euphorbia lathyris sightings (Various states, USA) 3. Holcus lanatus in California (California, USA) 4. Mute swan management (Wisconsin, USA) 5. Using lake water with herbicides (New York, USA) 6. Web site additions (Global, Planet Earth) 7. TNC weed-jobs in the keys (Florida, USA) --------------------------------------- 1. Didymosphenia video (Global, Planet Earth)
northern North America. However, in recent years it has been expanding its range southwards. Reasons for this are unclear, and may be related to increased levels of uv-radiation which might be killing those organisms that graze upon the diatom. In 2004, it was detected in New Zealand, where it is now the target of a national countrol program. Didymosphenia has the common names didymo and rock snot. It looks like a thick, matted orange fur and feels like wet cotton. Thick infestations must be seen, at least on film, to be believed. For more information, follow the links below: http://www.epa.gov/Region8/water/monitoring/didymosphenia.html (rock snot in northern USA) http://www.biosecurity.govt.nz/didymo (New Zealand Biosecurity) http://www.southlandfishgame.co.nz/didymo.htm (NZ video, requires DivX player---downloadable for free) --------------------------------------------------------------- 2. Euphorbia lathyris sightings (Various states, USA)
reported Euphorbia lathyris in New York and asked for other reports. Here is what we heard: CALIFORNIA We've got two hardy populations of Euphorbia lathyris here at Bodega Marine Reserve and have begun control efforts in the last year by handpulling. We have had pretty decent results so far, but follow-up treatments will certainly be necessary. --Michelle Cooper, mlcooper(at)ucdavis.edu MASSACHUSETTS This is to report a small colony of Euphorbia lathyris at the Massachusetts Audubon Society's Boston Nature Center in Boston. I first noticed this species in 2003 while conducting a botanical inventory of the Boston Nature Center. I collected a specimen, which I will submit to an herbarium. This is apparently the first record of this species for Suffolk County Massachusetts and it was previously only known in Massachusetts from a report from Nantucket. Since 2003 the colony has been reduced in size. It occurs adjacent to community gardens at the Boston Nature Center and may have been introduced by the gardeners. Since 2003 portions of the original colony have been covered with a compost pile and other portions have been overgrown with Japanese knotweed. Currently, only a few plants remain. I will be conducting a more thorough survey of the area later this summer and removing any plants I find. I also plan to prepare a flyer with identification information to distribute to the community gardeners asking them to report any other occurrences they find. --Lou Wagner, lwagner(at)massaudubon.org OREGON Our county weed specialist brought in a plant this summer that I identified as caper spurge (Euphorbia lathyris). It was found near Keno in Klamath County, Oregon. The elevation there is a little over 4,000 feet, so this population represents an extension of the described elevation range of this species. The intention of the county is to control this population. --Lou Whiteaker, lou_whiteaker(at)blm.gov --------------------------------------------------------------- 3. Holcus lanatus in California (California, USA)
for information on control methods. We have experimented on small patches with RoundUp, POAST (sethoxydim), and low-intensity mowing in the spring and summer with little success. Any information regarding successful (or unsuccessful) control methods for Holcus would be much appreciated. --------------------------------------------------------------- 4. Mute swan management (Wisconsin, USA)
our project area because the swans compete for resources with native migratory waterfowl. We are not involved in the actual removal, but we are providing access to and through our land so DNR staff can carry out their work. This issue is understandably controversial, and the DNR is starting to get a lot of heat on this issue. Have any other TNC chapters dealt with removal of mute swans, or had experiences with similar sorts of situations? We are starting to get questions from our chapter membership. ---------------------------------------------------------------
herbicide prior to application has come up before on this listserve. I have a new variation on this question. Does anyone have experience or advice about using lake water with high pH, especially if it has lots of plankton in it? I'm using Garlon 4 on swallow-wort in undeveloped islands with no access to any water except the limestone-enriched water of Lake Ontario. I have used a common funnel-based screen filter, but the overall effectiveness of the treatment on the swallow-wort was very discouraging. Is the lake water at fault? --------------------------------------------------------------- 6. Web site additions (Global, Planet Earth) From: Barry Rice (bamrice(at)ucdavis.edu) Invasives alerts have been posted on our web site for: Glyceria declinata--an invading grass in California Rhinogobius brunneus--a goby detected in Washington Mytella charruana--a mussel detected in Florida Furthermore, we have posted a new knotweed (Polygonum cuspidatum, etc.) brochure from Oregon, and VERY EXCITING, a new retro-horror-movie Public Service Announcement on the devilish threat, Chondrilla juncea (rush skeletonweed). To review these materials, go to our front page at: http://tncweeds.ucdavis.edu --------------------------------------------------------------- 7. TNC weed-jobs in the keys (Florida, USA) From: Alison Higgins (ahiggins(at)tnc.org) The Nature Conservancy in the Florida Keys has 7 positions we are looking to fill. The job descriptions for the following positions are temporarily placed on the GISI web site, urls below. 1 Conservation Assistant (starts Sept 18 2006, ends Sept 18, 2007, with possible renewal. Full benefits) http://tncweeds.ucdavis.edu/temp/con-assist.doc 1 Exotics Strike Team Leader (starts Sept 18, ends July 15. Full benefits) http://tncweeds.ucdavis.edu/temp/strike-leader.doc 4 Exotics Strike Team Members (Starts Oct 2, ends July 15. Full benefits) http://tncweeds.ucdavis.edu/temp/strike-member.doc 1 Contracts Manager (starts November-ish, ends May-ish, no benefits) (not yet available, contact me) Each position has its own specialties and skill sets. In reading your resume, we will not only consider you for the position you have applied for, but also see if you might be a better match for another position. Send a resume/coversheet to knorris(at)tnc.org. Thank you for your interest. We run a great program down here and are excited to expand our program. To learn more about some of our accomplishments, here is a summary: http://tncweeds.ucdavis.edu/success/fl001.html |
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Updated January 2007 ©The Nature Conservancy, 2006 |
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