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Global Invasive Species Team listserve digest #125
Fri Mar 19 2004 - 15:18:07 PST

1. A quick note on listserv policies (Global, Planet #3)
2. New resources at the WIST web site (Global, Planet #3)
3. Wildfire and weeds survey (Western States, USA)
4. Imminent meetings (Nationwide, USA)
5. Possible glossy buckthorn pathogen (Eastern USA)
6. Weed Alert! Tansy ragwort in the Northeast (Northeastern states, USA)
7. Georgia TNC produces a great brochure (Georgia, USA)
8. Aridlands, fire and invasives network (Western North America, USA)


1. A quick note on listserv policies (Global, Planet #3)
From: Barry Rice (bamrice(at)ucdavis.edu)

To speed download times for people with slow connections, attachments are
NEVER included on this listserve. If we have important files for you to
download, we do this by posting links to our web space.

If you ever get a listserve email from us that includes attachments, you
can be confident the email is a forged message, and contains spam or a
virus payload. Delete such email immediately.


2. New resources at the WIST web site (Global, Planet #3)
From: Barry Rice (bamrice(at)ucdavis.edu)

The elves at WIST have been busy providing documents for your pleasure!
Sail your web browser to http://tncinvasives.ucdavis.edu and look at the list
of "New Web Site Resources" from February and March. They include:

**A success story from the Sandy River, Oregon
**Knotweed control methods, compliments Jonathan Soll (TNC-Oregon)
**Reviews of two new tools, one that steams, another that foams!
**Finally, a CRAZY video you can view that talks about the dread threat,
  KNOTWEED! I am already seeing copies of this video passed around from
  one weed geek to another. This is not a WIST product, we're just
  publicizing it for the creators.


3. Wildfire and weeds survey (Western States, USA)
From: Mandy Tu (imtu(at)tnc.edu)

**Mandy forwarded this message from Lisa Rew (Montana State University).
Please take a few minutes to complete this survey (by April 9) on the
effects of wildfire (not prescribed fire) on non-native plant species.
The survey will help us obtain a better understanding of:

A. wildfire management activities which are correlated with non-native
plant occurrence,

B. site variables which are correlated with non-native plant occurrence,

C. methods and protocols used for inventory/survey and monitoring of
non-native plant species, and

D. the most invasive non-native species after wildfire.

Products from this study will include a synthesis of these survey
results and a literature review. The survey is available at:



4. Imminent meetings (Nationwide, USA)
From: Barry Rice (bamrice(at)ucdavis.edu)

Mark your calendars, complete your registrations! As noted on our
"meetings" web page (http://tncinvasives.ucdavis.edu/meetings.html), recently
announced invasives meetings include:

**Medusahead Challenge, 21-22 April, Oregon
**Natural Areas Conference, 13-16 October, Chicago


5. Possible glossy buckthorn pathogen (Eastern USA)
From: Barry Rice (bamrice(at)ucdavis.edu)

In a message chain including Marilyn Jordan (TNC) and Cynthia Boettner
(USF&WS), I've learned that Andrew Sheere (Future Generations Forestry,
Vermont) is studying a pathogen that appears to be affecting glossy
buckthorn (Rhamnus frangula). Symptoms in a 15+ year old stand of 2-4" DBH
plants included "oozing stems, sunken cankers in some places and in others
places, clusters of small, dry, dark gray fruiting bodies were noted. As
the infected stems were dying back, they were resprouting from the base of
the plant but the sprouts were not at all vigorous."

If you observe this in your glossy buckthorn infestations, please contact
Andrew Sheere (802-886-1699, fgforestry(at)vermontel.net).


6. Weed Alert! Tansy ragwort in the Northeast (Northeastern states, USA)
From: Mandy Tu (imtu(at)tnc.org)

Tansy ragwort (Senecio jacobaea), a widespread and noxious weed in 6
Western states, has recently been discovered in Worcester County in
Massachusetts and in Hancock County, Maine. Previously, tansy ragwort was
only known in the Northeast from Essex County, Massachusetts and
Cumberland County, Maine. This represents a range expansion for the
species, and nearby counties and states should be on the look-out for this
pestiferous plant which can invade grasslands and meadows, and can greatly
devalue pastures.

We were about to write a new Weed Alert for the WIST web site on this range
expansion of tansy ragwort, when we discovered that the inestimable Dr.
Les Mehrhoff of the IPANE (Invasive Plant Atlas of New England) project
has already spilled some electronic ink and had written his own Invasive
Species Alert, complete with a new fact sheet about the plant. Go Les Go!
For further information about tansy ragwort in the Northeast, see


7. Georgia TNC produces a great brochure (Georgia, USA)
From: Elizabeth Sklad (esklad(at)tnc.org)

Elizabeth pointed out a fabulous brochure that The Nature Conservancy
(Georgia) produced on invasives in southern Georgia:
http://nature.org/wherewework/northamerica/states/georgia/files/ south_georgia_invasive_species_brochure1.pdf

(You'll probably have to cut/paste that url to fit on one line.
In case it is taken down from that site, we have a copy available at:

This is a nice model for a state brochure.


8. Aridlands, fire and invasives network (Western North America, USA)
From: Bob Unnasch (bunnasch(at)tnc.org)

Save May 18-20 on your calendars!

The three major drivers of ecosystem change in the arid West are grazing
management, fire regime, and invasive species. These act both
independently and in conjunction to create the dramatic changes we see in
the integrity of our arid rangelands--think of "cheatgrass hell" in the
Great Basin. During the past three years, the Aridlands Grazing Network
has addressed the first two, but has only touched on the last. Yet,
invasives may be the most pervasive threat to biodiversity in the arid

Working with John Randall and Mandy Tu of the Invasive Species
Initiative we have designed a three-meeting cabal to aid conservation
practitioners in abating the threat of rangeland invasives. Through these
meetings we will address:

1. Fire/weed interactions
--weeds altering fire regimes
--weeds invading burned areas and how to prevent or minimize this
--use of prescribed fire to control weeds

2. Defining conditions for desired conservation target viability ranks
(e.g. for "good" or "very good") and desired threat ranks for invasive
species threat levels (i.e. "moderate" or "low") (aka setting measurable
objectives for desired future conditions of targets and invasive species
threats to the targets).

3. Assessing and prioritizing invasive plants for control (at real sites,
by species and by location within the site), including the use of models
to predict the potential spread of and damage by invaders.

4. Weed control techniques - herbicides, biocontrol, grazing, fire,
competitive plantings, including use of models to predict the potential
effectiveness of different control strategies.

5. Weed control as a component of restoration, i.e. emphasize the
necessary follow-up activities for weed control programs, including
plantings, soil treatments, implementation of prescribed fire programs,

6. Monitoring invasive plants threats and effects of management efforts,
and tying this topic to defining desired conditions (see 2 above).
Focusing on definitions of management and monitoring goals, sample design,
trend and threshold monitoring, analysis of the data and use of this
analysis to revise management AND objectives.

Depending on participant interest we may add an additional session focused
on animal invaders.

The first meeting will be in Lewiston, Idaho on may 18-20. The session
will include a full day field trip up the Snake River to visit the Hell's
Canyon site.

Updated March 2004
©The Nature Conservancy, 2004