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Global Invasive Species Team listserve digest #055
Tue Mar 07 2000 - 12:47:34 PST
--CONTENTS--
1. Pulling Loosestrife (Virginia)
2. Purple Loosestrife declared noxious (Nebraska)
3. More on killing knotweeds (Oregon)
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1. Pulling Loosestrife (Virginia)
From: Jil Swearingen (jil_swearingen(at)nps.gov)
(Jil sent us this email from a cohort who has some comments on pulling
Purple Loosestrife (Lythrum salicaria) in Virginia.)
We have found that pulling Purple Loosetrife exacerbates the invasion
problem, as the tiny rootlets that are left behind root very readily and
produce numerous plants--Purple Loosetrife should not be pulled! The best
treatment still remains stump treating the cut stems with RODEO...it is
labor intensive, but there is no danger of drift damage as would happen
with foliar applications, the soil is not disturbed, nor are any plant
parts left behind to revegetate. Care needs to be taken to place the cut
stems up off the soil where they can't set root.
On another Purple loosetrife note, the Virginia legislature made the plant
a "noxious weed", which should stop the sale of the plant at nurserys,
etc.
Susan
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2. Purple Loosestrife declared noxious (Nebraska)
From: Chris Helzer
They've decided to officially list purple loosestrife as a state noxious
weed here in Nebraska. Several conservation/land management groups
(including TNC), as well as a lot of other people, testified against the
listing by the State Dept of Ag, but they did it anyway.
The enforcement will start next January (2001) and will (they say) be
targeted at eliminating new and small populations and chipping away at
larger ones.
It will be interesting to see if TNC and other Platte River and Niobrara
River landowners get forced to start spraying our large colonies on the
river. We were hoping to convince the Ag Dept that since all the
populations exist on non-tillable land that it wasn't an economic problem.
Our big worry is that landowners will start aerial spraying the river to
get rid of the loosestrife.
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3. More on killing knotweeds (Oregon)
From: Jonathan Soll (jsoll(at)tnc.org)
I've heard from two reputable sources in the past three months that Garlon
3A is effective at killing japanese knotweed (Polygonum cuspidatum) and
giant knotweed (Polygonum sachalinense) with a single application. They
applied it in the fall on cut stems, on a single clump about 2 x 5 m (6 x
15 feet) in size. At least around here, Garlon 3A is approved for use
near, but not in water, and the direct/stem/swabbing application method
might help get a control project through the relevant permit and
compliance process for the grey area most knotweed patches occupy. I am
trying to get use approved by the USFWS and NMFS to use it at least on a
test basis along the Sandy River in Oregon. I'll post news as it occurs.