[MAIPC] question about knotweed

[Marc Imlay]

For a small patch, I have had 100% success with foliar spray about waist to
chest high. I casually and safely sprayed some of the under sides of the
leaves. Without the underside treatment component I did not get 100%
success. 

 

 

Marc Imlay, PhD, Conservation biologist, Park Ranger Office, Non-native
Invasive Plant Control coordinator. 
(301) 442-5657 <tel:%28301%29%20442-5657>  cell  ialm at erols.com
<mailto:ialm at erols.com> 
Natural and Historical Resources Division
The  Maryland-National   Capital   Park  and Planning Commission
 <http://www.pgparks.com/> www.pgparks.com  

 

From: MAIPC [mailto:maipc-bounces at lists.maipc.org] On Behalf Of Todd
Hagenbuch
Sent: Thursday, April 23, 2015 7:13 AM
To: Celia V. Martin; maipc at lists.maipc.org
Subject: Re: [MAIPC] question about knotweed

 

Celia:

 

Based on a Penn State Study, it is better to let the Japanese Knotweed
stalks get full height by early June then cut them down.  They will grow
back to about waist to chest high by late August/early September.  At that
point, a high volume application(truck mounted hydraulic sprayer) of Rodeo
2-3 qts per 100 gallons of water + surfactant 1-2 qts per 100 gallons of
water.  Application volume should be around 150-200 gallons per acre(really
soak down the Knotweed).  This combination has shown to reduce the Knotweed
by 95% or so.  A follow up the next season would be prudent.  For more
information on this, Art Gover from Penn State can be a great resource.  

 

Best Regards,

 

 

Todd Hagenbuch

Vegetation Management Specialist

Arborchem Products 

2505 Coventry Lane

Glen Mills, PA 19342

570-401-7098

thagenbuch at arborchem.com <mailto:thagenbuch at arborchem.com> 

www.arborchem.com <http://www.arborchem.com/> 

 

 

 

From: MAIPC [mailto:maipc-bounces at lists.maipc.org] On Behalf Of Celia V.
Martin
Sent: Tuesday, April 21, 2015 9:25 AM
To: maipc at lists.maipc.org <mailto:maipc at lists.maipc.org> 
Subject: [MAIPC] question about knotweed

 

If we cut the knotweed buds now, does it have any effect on the stalk's
growth?  What is the most efficient way to deal with it?

 

Thank you.

C

 

Celia V. Martin

301-325-5301

celiavmartin at comcast.net <mailto:celiavmartin at comcast.net> 

 

AppleTree Institute awarded a US Dept of Ed Investing in Innovation ("i3")
grant for Every Child Ready. Read more at: www.appletreeinstitute.org
<http://www.appletreeinstitute.org> 

 



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