[MAIPC] Fwd: [NativePlantseast] Smartweed management?
Richard Johnstone
ivmpartners at gmail.com
Wed Jul 15 05:34:51 PDT 2015
We seldom use glyphosate for commercial herbicide applications on utility
rights-of-way, except for treatment in wetlands with Rodeo or Accord.
Selective chemistry works much better and at lower rates, without
collateral damage if you selectively apply with backpacks. Milestone (Dow)
and Method (Bayer) both have chemistry that will target these invasives
without damaging grass. About 1 ounce per backpack in water with surfactant
should do the trick.
Rick
On Mon, Jul 13, 2015 at 9:32 PM, Hughes, Jake <jake_hughes at nps.gov> wrote:
> Lori,
>
> We have a pretty bad problem with Oriental lady's thumb (Polygonum
> cespitosum, Persicaria longiseta) here at Shenandoah National Park. Like
> the native PA smartweed, it has pink flowers/fruit, but they're smaller,
> and the leaf sheath around the stem (ocrea) is fringed with long hairs.
> It's our second most widespread and abundant nonnative weed, and is often
> found in near monocultures. Oriental lady's thumb seems to really thrive
> and persist in mesic, higher elevation sites in the park. At lower
> elevations it seems a bit more ephemeral.
>
> Assuming your smartweed is confirmed as this or another of the small
> handful of nonnative species, you're correct--you won't find much guidance
> on dealing with it. We've found it's easy to kill, but not very easy to
> kill without collateral damage. A glyphosate product such as Rodeo (54%
> glyphosate) can be used at low concentrations (0.5% has been pretty
> consistently effective, 0.25% less so) on heavy infestations. Weed
> whacking it close to the ground before seed set can knock it back. In
> upland areas, preemergent products (e.g. pendimethalin, prodiamine) can be
> useful, and are probably your best option for avoiding damage to native
> perennials. But these may not be an option if you're near a stream.
> Contact herbicides such as pelargonic acid (e.g. Scythe at 5 to 10%
> concentration) are also pretty effective, if applied early and before rigid
> stems develop. Flaming with a propane torch should work too, if you're
> into that.
>
> Since mowing probably leaves enough above-ground tissue for the plants to
> rebound, I doubt it would effectively control Oriental lady's thumb. And
> certainly if it's being mowed after seed set, the seeds are being thrown
> far and wide.
>
> Hope this is somewhat helpful, should you need to deal with this plant.
>
>
> On Mon, Jul 13, 2015 at 6:13 PM, Lori Bowes <lrbowes2 at yahoo.com> wrote:
>
>> Hi. I get confused about smartweed/knotweed but I can say that every
>> time I have asked a plant-knowledgeable person about our smartweed, they
>> felt it was the invasive type.
>>
>> I think in my haste to get this posted before a Grounds meeting I relied
>> on a google entry that told me that PA smartweed was invasive so I thought
>> that was the one we have.
>>
>> I guess I need to affirm that my ocrea is not bristled.
>>
>> Assuming ours is the invasive species, if you have guidance on whether
>> mowing is worsening the problem, please let me know.
>>
>> Thanks,
>> Lori
>>
>>
>>
>> On Monday, July 13, 2015 4:40 PM, Art Gover <aeg2 at psu.edu> wrote:
>>
>>
>> I like PA smartweed. It’s native and charming and fills space. Sure
>> about the ID?
>>
>> Be well.
>>
>> Art
>>
>> Penn State Wildland Weed Management
>> 116 ASI Building
>> University Park, PA 16802
>>
>> (814) 863-9904
>> (814) 863-7043 FAX
>> http://plantscience.psu.edu/wildland
>>
>> > On Jul 13, 2015, at 16:37, frazmo <frazmo at gmail.com> wrote:
>> >
>> > Any thoughts out there in MAIPC land? If possible, copy the asker,
>> lrbowes2 at yahoo.com, directly also as I'm not sure she's on our list.
>> Cheers, Steve Young
>> >
>> > ---------- Forwarded message ----------
>> > From: "lrbowes2 at yahoo.com [NativePlantseast]" <
>> NativePlantseast at yahoogroups.com>
>> > Date: Jul 13, 2015 12:34 PM
>> > Subject: [NativePlantseast] Smartweed management?
>> > To: <NativePlantseast at yahoogroups.com>
>> > Cc:
>> >
>> >
>> >
>> >
>> >
>> > My community has an abundance of Polygonum pensylvanicum on a turf
>> hillside that abuts a stream (on the other side of which is a wooded area)
>> and a terraced native plant area (with asters, goldenrods, grasses,
>> viburnums, violets, etc). The Polygonum is thriving amongst the turf and
>> is constantly invading the native plant terrace.
>> >
>> >
>> >
>> > We have some flexibility in how we manage the turf hillside in terms of
>> mowing. Can anyone offer some thoughts or guidance?
>> >
>> >
>> >
>> > I haven't found much on the web in the way of guidance for this topic.
>> >
>> >
>> >
>> > Thanks,
>> >
>> > Lori
>> >
>> > Arlington, VA
>> >
>> >
>> > __._,_.___
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>
>
> --
> Jake Hughes
> Lead Biological Science Technician
> Shenandoah National Park
> 3655 US Hwy 211 E
> Luray, VA 22835
> Jake_Hughes at nps.gov
> Office: 540-999-3500 ext 3492
> Fax: 540-999-3697
>
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