[MAIPC] [External] Slate Article on Japanese Knotweed

[frazmo]

I definitely agree that knotweed is being spread by dispersal of viable
fragments through events like flooding but also significantly by direct
human activities where contaminated fill is applied to a site and/or
contaminated equipment is used at a new location. My favorite example is is
Maine where I observed many utility poles, each surrounded by a patch of
knotweed, and surmised that contaminated auger drills had been used to
"plant" the poles. Quite the way to vector the problem widely. Admittedly
that's personal observation and conjecture.

On Thu, May 9, 2019 at 11:53 AM Rohrbaugh, Andrew <anrohrbaug at pa.gov> wrote:

> 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
>
> www.dcnr.state.pa.us
>
>
>
> *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>
> *Subject:* [External] [MAIPC] Slate Article on Japanese Knotweed
>
>
>
> *ATTENTION: **This email message is from an external sender. Do not open
> links or attachments from unknown sources. To report suspicious email,
> forward the message as an attachment to CWOPA_SPAM at pa.gov
> <CWOPA_SPAM at pa.gov>.*
>
> Read this article if you want to experience real terror...
>
>
>
> https://slate.com/technology/2019/05/japanese-knotweed-invasive-plants.html
> <https://gcc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fslate.com%2Ftechnology%2F2019%2F05%2Fjapanese-knotweed-invasive-plants.html&data=02%7C01%7Canrohrbaug%40pa.gov%7Cd84b1837366f42e87e4708d6d494bd90%7C418e284101284dd59b6c47fc5a9a1bde%7C0%7C1%7C636930132639163595&sdata=6euR5Q4YjKQ7tBVg4ageeYyi2PSno8dqPQsm%2BuvhRKQ%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
>
>
> _______________________________________________
> MAIPC mailing list
> MAIPC at lists.maipc.org
> http://lists.maipc.org/listinfo.cgi/maipc-maipc.org
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.maipc.org/pipermail/maipc-maipc.org/attachments/20190509/9d9fb134/attachment.html>