[CANUFNET] CANUFNET Digest, Vol 170, Issue 22

Tue Apr 23 10:17:25 EDT 2019

Metro Vancouver has recently created new BMPs for the region (including the Knotweeds) which can be found here:

http://www.metrovancouver.org/services/regional-planning/conserving-connecting/invasive-species/Pages/default.aspx

I haven't heard of a specific material used as a barrier.

From the knotweed BMP:

•  Smothering involves the use of light blocking materials. Many smothering materials are unsuitable – they must be thick and heavy such as recycled conveyor belt. Maintenance visits will be necessary to ensure the cover has not been breached and new shoots do not sprout along edges. Be prepared to expand the covered area over the first few growing seasons as the knotweed spreads beyond the initial area smothered (Clegg 2018). Sites observed in BC where smothering materials were in place for over 10 years have not been successful (Chadburn 2018) (McLean 2018).

•   Excavation with heavy equipment requires all root material to be removed, which requires digging 3 metres deep and up to 20 metres wide (BC Ministry of Transportation and Infrastructure 2016). Great care must be taken when excavating knotweeds as this activity has a high risk of spreading plant fragments. Equipment should be thoroughly washed onsite before transport to reduce risk of spread. Ensure a disposal plan is in place prior to excavating (see Disposal section below). Monitor and treat areas with herbicide after excavation.

•   For large operations, such as gravel pits, knotweed plant parts, rhizomes, and seeds can be buried on site to a minimum depth of 5 metres. Any regrowth should be chemically treated. These sites should be physically marked and records should be kept on file for future referral should re-development of the site occur. Burial sites should be monitored for regrowth on an ongoing basis.

The recommended treatment is the use of herbicide injection and/or backpack spraying.  In Surrey on public land, we treat with herbicide (glyphosate) where permitted.  If soil needs to be disturbed we try to minimize any spread and will monitor the site.  If soil has to leave site, the soil needs to be considered infested and disposed of at an appropriate facility.

Ken Crosby | Natural Areas Coordinator
CITY OF SURREY
Urban Forestry
6651 – 148th Street, Surrey, BC, Canada V3S 3C7
T 604.501.5130 | F 604.501.5177 | www.surrey.ca

-----Original Message-----
From: CANUFNET <canufnet-bounces at list.web.net> On Behalf Of Sylvain Martel via CANUFNET
Sent: April 18, 2019 9:38 AM
To: canufnet at list.web.net
Cc: Sylvain Martel <smartel42 at gmail.com>
Subject: Re: [CANUFNET] CANUFNET Digest, Vol 170, Issue 22

Incineration has been used in the past but I don’t know how efficient it is.

> On Apr 18, 2019, at 9:00 AM, canufnet-request at list.web.net<mailto:canufnet-request at list.web.net> wrote:

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>   1. Re: Seeking help to find a root barrier material

>      (Michael Richardson)

>

>

> ----------------------------------------------------------------------

>

> Message: 1

> Date: Wed, 17 Apr 2019 15:44:12 -0400

> From: "Michael Richardson" <mrtree at kos.net<mailto:mrtree at kos.net>>

> To: "Canadian Urban Forest Network" <canufnet at list.web.net<mailto:canufnet at list.web.net>>

> Subject: Re: [CANUFNET] Seeking help to find a root barrier material

> Message-ID:

>    <514330c913888cde5fd0548233d08003.squirrel at webmail.kos.net<mailto:514330c913888cde5fd0548233d08003.squirrel at webmail.kos.net>>

> Content-Type: text/plain;charset=iso-8859-1

>

> Attached is one possibility

>

> https://can01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.greenblue.com%2Fna%2Ftype%2Froot-management%2F&data=02%7C01%7Ckbcrosby%40surrey.ca%7Cd36aeb2dc7bf46f68ef308d6c41c9634%7Cdabca0329edf4a38812823f1c18ab2a3%7C1%7C0%7C636912024387564700&sdata=%2F4u6SKV%2FpvpXaOY3iJbGQdvuJEWBHZZVgefDHMtP5rc%3D&reserved=0

>

> I believe they need to line the entire pit, not just a barrier along the

> edges..

>

> I suggest chemical treatment of the plants prior to removal of the soil.

> I have successfully used Roundup Transorb and Clearview with Gateway.

>

> Japanese Knotweed is an incredibly tough plant and is almost impossible to

> control without chemicals.

>

> Michael

>

>

>> From Iola Price, CANUFNET subscriber and President of the Ontario Invasive

>> Plant Council

>>

>> An engineering group has reached out to the Ontario Invasive Plant Council

>> and

>> is inquiring about Japanese knotweed management. They would like to bury a

>> large volume of material in a pit lined with a root barrier material, but

>> are having difficulty finding said root barrier material.

>>

>>

>>

>> If anyone is aware of any materials that have been used by other agencies,

>> or any projects or coordinators that could be reached out to, your

>> assistan

>> ce would be appreciated!

>>

>>

>>

>> Please respond to gabby at oninvasives.ca<mailto:gabby at oninvasives.ca>

>>

>> Thanks in advance!  Iola and Gabby

>>

>> *Gabby Nichols, *BBRM, MES

>>

>> Project Liaison

>>

>> 705-741-5400 ext 202

>>

>> 380 Armour Road, Unit 210.  Peterborough, ON  K9H 7L7

>>

>>

>>

>> [image: NEWOIPClogofinal]

>>

>>

>>

>> https://can01.safelinks.protection.outlook.com/?url=www.OntarioInvasivePlants.ca&data=02%7C01%7Ckbcrosby%40surrey.ca%7Cd36aeb2dc7bf46f68ef308d6c41c9634%7Cdabca0329edf4a38812823f1c18ab2a3%7C1%7C0%7C636912024387564700&sdata=E1dYJFX%2FGVOaacVOOQK6vUkIhBbFMcJzQ7VOhzSRhuw%3D&reserved=0

>> <https://can01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.ontarioinvasiveplants.ca%2F&data=02%7C01%7Ckbcrosby%40surrey.ca%7Cd36aeb2dc7bf46f68ef308d6c41c9634%7Cdabca0329edf4a38812823f1c18ab2a3%7C1%7C0%7C636912024387564700&sdata=78RnL8%2Fx1P%2Bxrgqlgn64xoJh6YZInkSZFJfn4AXnlrg%3D&reserved=0>

>>

>>

>>

>> *Empowering Ontarians to take action on Invasive Plants!*

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> End of CANUFNET Digest, Vol 170, Issue 22

> *****************************************
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