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Global Invasive Species Team listserve digest #100 (wow!)
Thu Feb 21 2002 - 16:24:07 PST
--CONTENTS--
1. TNC staffers take note! (Global)
2. Cocklebur and burdock control (Oregon, USA)
3. More cocklebur control (Ohio, USA)
4. Bad news regarding Vinca (California, USA)
5. Good news regarding Lonicera (Maryland, USA)
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1. TNC staffers take note! (Global)
From: Barry Rice (bamrice(at)ucdavis.edu)
If you are a TNC staffmember, and your email address for receiving this
listserve does not end with "(at)tnc.org", please contact me. We need to
determine who on this listserve is TNC staff. (We have some TNC-specific
documents, etc., to distribute and do not want to bother non-TNC staff
with this.)
Thanks!
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2. Cocklebur and burdock control (Oregon, USA)
From: Ray Guse (rguse(at)tnc.org)
Two years ago we began controlling burdock (Arctium sp.). Cursory
observations indicate it is working. We began by clipping and bagging seed
heads early in development and returning one month later to do the same.
Here in Oregon the first effort is made in early June. This project was
initiated by a volunteer, and volunteers have been accomplishing most of
the work. I will begin controlling burdock with this method on a larger
scale this year on the Zumwalt Prairie Preserve. I also use machetes to
cut the plants down in an effort to keep them from flowering but you must
be highly safety conscious with these long knives.
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3. More cocklebur control (Ohio, USA)
From: Jennifer Vollmer (vollmej(at)basf-corp.com)
When I was a researcher in Ohio , one non-chemical means of cocklebur
(Xanthium) control was no-till. When cocklebur seeds were allowed to lay
on the soil surface there were bug(s) that would feed on this seed over
the winter. After many years of no-till a farmer could greatly reduce his
cocklebur population through not tilling cockleburs under and hand pulling
what ever possible.
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4. Bad news regarding Vinca (California, USA)
From: Barry Rice (bamrice(at)ucdavis.edu)
I have received two reports from northern California describing cases of
periwinkle (Vinca major) reproducing from seed. Alfred White and Bill
Grummer both described how Vinca grew back following glyphosate control
programs in Napa County. They first thought they were seeing resprouts,
but careful investigation revealed otherwise. Bill noted, "A few years ago
I definitely found seedlings in the cotyledon stage. This year I found
Vinca major seedlings with the seedcoat still encasing the yellow
cotyledons."
This is the first report I have found of Vinca major reproducing by seed
in a non-native, wildland setting. The species is believed to be a
polyploid descendant of Vinca minor, and this genetic multiplication is
usually cited as being the reason for low fertility.
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5. Good news regarding Lonicera (Maryland, USA)
From: Marc Imlay (ialm(at)erols.com)
Winter weather brought a turnout of 14 volunters and we cleared 10 acres
using the following remarkably efficacious new technique for Japanese
honeysuckle (Lonicera japonica)
We pull out Japanese honeysuckle by the roots in winter wherever we see it
up in the trees, aim the roots upward and tie them in place. The absence
of light energy causes the trailing vines to decline precipitously next
year. Thus we control 90% of the honeysuckle with 10% of the effort and
minimal soil disturbance (do not pull it out of the trees and watch for
native vines (moonseed, trumpet vine, native grape etc.). This method
greatly reduces spraying requirements.
Removing above-ground stems by pulling will not kill Lonicera japonica as
it will resprout from subterranean buds and roots. Use glyphosate or
triclopyr in winter or late fall to avoid natives.