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Global Invasive Species Team listserve digest #122
Fri Jan 23 2004 - 17:08:17 PST
--CONTENTS--
1. Emerald Ash Borer (Nationwide, USA)
2. Rumex crispus, Conyza canadensis, Cirsium vulgare (California, USA)
3. Polygonum sachalinese (giant knotweed) (South Dakota, USA)
4. Japanese stilt grass dispersal and biocontrol (Eastern USA)
5. Russian olive control (Colorado, USA)
6. CAPS database--do you use it? (Indiana, USA)
7. Questions on some weeds (Wyoming, USA)
8. Gerber daisies (New York, USA)
9. Leymus arenarius (Connecticut, USA)
10. Wild hogs (North Carolina, USA)
11. Clopyralid on Robinia (Wisconsin, USA)
12. Use of glyphosate on bentgrass (New York, USA)
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1. Emerald Ash Borer (Nationwide, USA)
From: Barry Rice (bamrice(at)ucdavis.edu)
A new beetle threat facing forests in North America is the Emerald Ash
Borer (Agrilus planipennis). In October, APHIS imposed a quarantine on
various vulnerable wood products (firewood, nursery stock, etc) from 13
Michigan counties.
Emerald Ash Borer has also been found in Ohio, Maryland, Virginia,
and Ontario (Canada)
Useful websites include
http://www.mdinvasivesp.org/eab/
http://www.americanlands.org/eab_map.htm
http://www.ohioagriculture.gov/pubs/divs/plnt/curr/eab/PLNT-eabindex2.stm
http://www.emeraldashborer.info/
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2. Rumex crispus, Conyza canadensis, Cirsium vulgare (California, USA)
From: Mike Kelly (mkellysd(at)aol.com)
Regarding the query on control methods, in digest #121:
I have had good luck with using Roundup Pro at 2% on Rumex crispus, Conyza
canadensis, and Cirsium vulgare. I suspect the other species listed would
respond to this. They should also be controlled well by appropriate mowing
or cutting programs, although these methods would have to be repeated 1 or
2 times since several will tend to resprout. The herbicide treatment is
more cost effective.
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3. Polygonum sachalinese (giant knotweed) (South Dakota, USA)
From: ron.moehring(at)state.sd.us
The Lawrence County Invasive Species Coordinator has found approximately
twenty giant knotweed (Polygonum sachalinese) plants in the Black Hills,
South Dakota. The plant clumps range in size from 1.2-6 meters (4-20 feet)
He has tried the following approaches will no success.
**Injecting the stems with Rodeo 5 cc per stem.
**Spraying 4qts of 2,4-D Amine and 4qts Rodeo plus 2qts Liberate
surfactant.
**Using a diesel pressurized torch and burning it burned up the leaves
that were affected by the herbicide 3 weeks earlier but the stems and root
system stayed intact.
Does anyone know what works to kill this plant. We want to stop it before
gets any worse.
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4. Japanese stilt grass dispersal and biocontrol (Eastern USA)
From: Ross Geredien (ross(at)goodmigrationsphoto.com)
I've been working to control Japanese Stilt Grass (Microstegium vimineum)
along some segments of the Appalachian Trail in central Pennsylvania. I
have noticed that when the trailside populations of Microstegium stalks
come to fruit, the stalks lean over directly over the treadway. The stalks
become matted down as hikers walk by, and seeds can be picked up by a
muddy hiking boot, and can then be carried a considerable distance.
I have noticed outbreaks along the Trail that are miles apart, with no
other apparent vector as the cause. Those who manage conservation lands
should be aware of boots as a possible vector.
Does anyone know of any research on biocontrol methods for M. vimineum? I
have heard of someone in Philadelphia studying the effects of applying
sulfur to the soil to lower soil pH, but I do not know anything more
specific.
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5. Russian olive control (Colorado, USA)
From: Brian Mihlbachler (brian.mihlbachler(at)usafa.af.mil)
Help! We have attempted to control nearly 2000 Russian olive plants
(Elaeagnus angustifolia) on the Air Force Academy by cutting and stump
treatment with concentrated RoundUp. Now we are seeing some resprouting of
small, multi-stemmed shrubs where there was once a single-stemmed (or
few-stemmed) tree. Recutting and chemically treating all the new stems
would be very laborious---does anyone know how effective spraying the
foliage with RoundUp or other chemicals might be in killing these devils?
I'm guessing that 20-30% of the plants we treated in 2002 and 2003 are
resprouting.
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6. CAPS database--do you use it? (Indiana, USA)
From: Ellen Jacquart (ejacquart(at)tnc.org)
A very quick question. Do you use the CAPS (Cooperative Agricultural Pest
System) database? If so, please contact me.
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7. Questions on some weeds (Wyoming, USA)
From: Charles Villalobos (charles_villalobos(at)nps.gov)
I'm trying to complete a risk assessment on maiden pinks (Dianthus
deltoides), mint geranium (Chrysanthemum balsamita), Deptford pinks
(Dianthus armeria), and cypress spurge (Euphorbia cyparissias). I need
background, reproduction, and ecological impacts on these species and have
not been able to find much info. Any help would be greatly appreciated.
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8. Gerber daisies (New York, USA)
From: Stacey Goldyn (sgoldyn(at)tnc.org)
I recently was asked about Gerber daisies. I have found no research on
the invasiveness of these flowers, or even where they are native to and if
they grow in the wild at all. Are they invasive in southeastern New York?"
Editor's note: I'm guessing "Gerber daisies" may be the same as Gerbera
daisies, i.e. plants from the genus Gerbera, including Gerbera
jamesonii. A quick web search suggests it is probably mostly harmless.---Barry
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9. Leymus arenarius (Connecticut, USA)
From: Ken Metzler (kenneth.metzler(at)po.state.ct.us)
Connecticut is compiling information about the ecology of the invasive
grass Elymus (=Leymus arenarius) and the consequences of its introduction
to native plant communities. Are there any studies that document the rate
of spread? How does Elymus spread (we assume by rhizome, rhizome
fragments and seed)? What habitats have been adversely impacts (we would
assume in addition to coastal dunes, that this plant could quickly spread
into sandplain environments)?
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10. Wild hogs (North Carolina, USA)
From: Beth Bockoven (bbockoven(at)tnc.org)
Wild hogs are being introduced along the Roanoke River in NC for hunting
clubs and hunt guides off-season shooting practice. Has anyone else has
dealt with wild hog introductions and have they been successful at the
policy level of getting this practice stopped?
Please send your information to Jeff Horton (jhorton(at)tnc.org)
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11. Clopyralid on Robinia (Wisconsin, USA)
From: Jay Walters (jay.walters(at)dnr.state.wi.us)
I am looking for information from anyone who has used clopyralid
(Transline) for control of Robinia pseudoacacia (black Locust) either as a
cut stump or as a foliar application.
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12. Use of glyphosate on bentgrass (New York, USA)
From: Marilyn Jordan (mjordan(at)tnc.org)
A review board from the Weed Science Society America and Animal and Plant
Health Inspection Service of USDA is investigating the potential impacts
of possible release of herbicide resistant creeping bentgrass. This could
affect those land managers dealing with this plant as an invader.
Do you have bentgrass or rabbitsfoot grass, and/or use glyphosate or
glufosinate products for control of these grasses? Please contact me with
your information.
**Have Agrostis or Polypogon species (also Agrostis/Polypogon hybrids)
been identified in your area? In what in what crops/ecosystems?
**Are glyphosate or glufosinate products used to control these species and
if so how are they used and how effective are they?
**In what crop/ecosystems would a glyphosate or glufosinate resistant
creeping bentgrass or other Agrostis species be a potential problem and
why?