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Global Invasive Species Team listserve digest #082
Fri Apr 13 2001 - 15:36:36 PDT

1. Feedback desired on Weed Control Methods Handbook (Global)
2. Backpack sprayers (California)
3. Rapistrum rugosum (Nevada)
4. Spreading Polygonum cuspidatum (Pennsylvania)
5. Poison hemlock (Washington)
6. Honeysuckles (Vermont)
7. Burning weeds (Pennsylvania)


1. Feedback desired on Weed Control Methods Handbook (Global)
From: Barry Rice (bamrice(at)ucdavis.edu)

While it is not yet on Oprah's book list, the Handbook on our Wildland
Invasive Species Team web site is getting great reviews from readers.
This is very gratifying. But please note that we strongly value your
constructive criticism on how we can improve the handbook. If you
encounter some inscrutable passage, or notice some oversight, please
contact us. We will incorporate your comments into future versions of the

If you have not seen the handbook, race your web browser to:
You can download it chapter by chapter, or as a single zipped file.


2. Backpack sprayers (California)
From: Becky Waegell (bwaegell(at)cosumnes.org)

Regarding Keith's backpack sprayer question in listserve posting #80: My
understanding is that diaphragm pumps are best if you are planning on
using wetted powders and/or liquid herbicides. Piston pumps can apparently
wear more rapidly when powders are used.


3. Rapistrum rugosum (Nevada)
From: Bruce Lund (blund(at)tnc.org)

Have any TNC staff have any experiences with Rapistrum rugosum (turnip


4. Spreading Polygonum cuspidatum (Pennsylvania)
From: Karen Jurkovic (kajurkovic(at)aol.com)

In a little more than a month, we will be truck-spraying to try to
eradicate Japanese knotweed (Polygonum cuspidatum) along the Kiski River
here in western PA. The group would like to brush hog the dead knotweed
before the spraying in a particularly large area of what appears to be
knotweed monoculture. The idea is to get rid of the dead stuff. Do you
think that is okay, or should they wait until after the spraying, or
should use the brush hog at all?

We are worried about the potential danger in helping the plant to spread
by dispersing seeds.


5. Poison hemlock (Washington)
From: Eliza Habegger (ehabegger(at)tnc.org)

Does anyone have experience controlling poison-hemlock (Conium maculatum)?
On one Washington preserve, the plant is common along public trails and
disturbed areas, and also appears to be invading an adjacent steep, sandy
hillside dominated by native shrubs.


6. Honeysuckles (Vermont)
From: Sherry Crawford (slcslcv(at)sover.net)

We want to manage honeysuckle (Lonicera morrowii, L. tatarica). We had
intended to cut and apply glyphosate to the stumps in April and May. I
just read the TNC Species Management Summary and it said, "Both glyphosate and triclopyr should
be applied to the foliage late in the growing season, and to cut stumps
from late summer through the dormant season." I am wondering if people
follow that recommendation and only apply the herbicide in the fall or do
they apply herbicide in the spring also? Has anyone had good results
cutting and painting the stumps of honeysuckle in the spring?


7. Burning weeds (Pennsylvania)
From: Betsy Lyman (blyman(at)tnc.org)

I would like to ask folks to send me information on using prescribed burns
for controlling weeds in the Mid-Atlantic region. I'm looking for
successes/failures, types of plant communities being burned, what season
and how often the burns were conducted, and any images that they would be
willing to share with me and allow me to use in talks (credit given, of
course). I'll be sharing these experiences with our partner agencies in
PA. Our chapter hasn't done many burns for invasive species control, so I
would like to see what other chapters have been doing. THANKS!

Herbaceous broadleaf:
 Garlic mustard (Alliaria petiolata)
 Canada thistle (Cirsium arvense)
 Purple loosestrife (Lythrum salicaria)
 Japanese knotweed (Polygonum (Falopia) cuspidatum)
 Spotted knapweed (Centaurea maculosa)

 Japanese stilt grass (Microstegium vimineum)
 Common reed (Phragmites australis)
 Reed canary grass (Phalaris arundinacea)
 Maiden grass (Miscanthus sinensis)

Trees and Shrubs:
 Autumn/Russian olives (Elaeagnus umbellata, E. angustifolia)
 Bush honeysuckles (Lonicera maackii, L. tartarica, etc.)
 Multiflora rose (Rosa multiflora)
 Norway maple (Acer platanoides)
 Japanese & European barberry (Berberis thunbergii, B. vulgaris)
 Commmon & glossy buckthorn (Rhamnus catharticus, R. frangula)
 Empress tree (Paulownia tomentosa)

 Japanese honeysuckle (Lonicera japonica)
 Oriental bittersweet (Celastrus orbiculatus)
 Mile-a-minute weed (Polygonum perfoliatum)
 Kudzu (Pueraria lobata)
 Japanese hops (Humulus japonicus)

Updated April 2001
©The Nature Conservancy, 2001