[MAIPC] [External] Slate Article on Japanese Knotweed

[Rohrbaugh, Andrew]

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<http://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


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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://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

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