[MAIPC] [External] Slate Article on Japanese Knotweed

Thu May 9 10:26:29 PDT 2019

Margot Bram and Jim McNair at the Academy of Natural Sciences documented seed viability in an effort to assess the importance of seed vs. vegetative propagation.

https://bioone.org/journals/Weed-Science/volume-52/issue-5/P2002-053/Seed-germinability-and-its-seasonal-onset-of-Japanese-knotweed-span/10.1614/P2002-053.full

Amy Thomas Niewinski's M.S. thesis at Penn State documented collection and growing of knotweed seed collected throughout PA.

https://cat.libraries.psu.edu/uhtbin/cgisirsi/?ps=hNARh46RPE/UP-PAT/X/9

Be well.

Art

Penn State Wildland Weed Management
116 ASI Building
University Park, PA  16802

(814) 863-9904
(814) 863-6139 FAX
http://plantscience.psu.edu/wildland

On May 9, 2019, at 13:17, Melissa Bravo <bravomelissa at yahoo.com<mailto:bravomelissa at yahoo.com>> wrote:

? I see pollen production on knotweed at my place, the bees love it. And I've always seen seed pods - so it would not be worth it to the plant ecologically speaking to bother producing seeds if not for some season where it would be beneficial  - - seasonal triggers often do not get captured in one year, two year small site studies..

but I did not read the article... just two -centencing- here lol.

Melissa A. Bravo, M.S. CCA, Agronomist
Meadow Lake Farm Consulting Services 814-574-4067 / bravomelissa at yahoo.com<mailto:bravomelissa at yahoo.com>

On Thursday, May 9, 2019, 12:50:22 PM EDT, Muth, Norris (MUTH) <MUTH at juniata.edu<mailto:MUTH at juniata.edu>> wrote:

There’s some knotweed hybridization which implies at least pollen production - and quite likely seed production. But the lack of genetic variability argues for clonal spread only. It’s sort of a similar story to Phragmites australis. Christina Richards - cited in the article - would likely know for sure.

What do you say Dr. Richards? Viable seed production at all?

—
Norris Z. Muth, Ph.D.
(he/him/his)
Juniata College
muthlab.org<http://muthlab.org>

________________________________
From: MAIPC <maipc-bounces at lists.maipc.org<mailto:maipc-bounces at lists.maipc.org>> on behalf of Rohrbaugh, Andrew <anrohrbaug at pa.gov<mailto:anrohrbaug at pa.gov>>
Sent: Thursday, May 9, 2019 11:53 AM
To: MAIPC Listserve
Subject: Re: [MAIPC] [External] Slate Article on Japanese Knotweed

I don’t think there’s much evidence of seed production, although I recall someone studying the genetics of knotweed- Norris, do you recall that study?

Knotweed is difficult to kill, but there’s some tricks to it (mowing it down first, letting it regrow, then spraying it)… and you have to keep after the patches. It’s got a really strong root system, and once it gets started in a disturbed area (due to a root fragment moving in during disturbance) subsequent disturbances make it hard to get other species established.

Andrew Rohrbaugh | Botanist

Pennsylvania Department of Conservation & Natural Resources
Bureau of Forestry | Ecological Services Section

PO Box 8552, 400 Market St, Harrisburg, PA 17105-8552
Phone: 717.705.2823 | Fax: 717.772.0271
anrohrbaug at pa.gov<mailto:anrohrbaug at pa.gov>

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From: MAIPC [mailto:maipc-bounces at lists.maipc.org] On Behalf Of frazmo
Sent: Thursday, May 09, 2019 11:41 AM
To: MAIPC Listserve <maipc at lists.maipc.org<mailto:maipc at lists.maipc.org>>
Subject: [External] [MAIPC] Slate Article on Japanese Knotweed

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Read this article if you want to experience real terror...

https://slate.com/technology/2019/05/japanese-knotweed-invasive-plants.html<https://nam01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fslate.com%2Ftechnology%2F2019%2F05%2Fjapanese-knotweed-invasive-plants.html&data=02%7C01%7Caeg2%40psu.edu%7Cd51333d993634e66611e08d6d4a23e5b%7C7cf48d453ddb4389a9c1c115526eb52e%7C0%7C0%7C636930190625070848&sdata=9ywzkgfBApA7NGlZNhVB%2B1UuRJ7IQRhU7Qo3pJTz7F0%3D&reserved=0>

And two questions for possible discussion:

1. Do MAIPC listserv readers find JK as hard to kill as described in the article?

2. I have seen isolated plants come up in some odd places. Does anyone know whether there is any evidence of JK spreading by seeds in our mid-Atlantic area?

Cheers,   Steve Young, Arlington VA volunteer

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