[MAIPC] question about knotweed

Thu Apr 23 05:24:04 PDT 2015

Does anyone have a recommendation for a surfactant to use with Rodeo?  I have been using a product called Competitor which is a modified vegetable oil, but the jug is almost gone and I would like to try something else.

From: MAIPC [mailto:maipc-bounces at lists.maipc.org] On Behalf Of Marc Imlay
Sent: Thursday, April 23, 2015 8:11 AM
To: maipc at lists.maipc.org
Subject: Re: [MAIPC] question about knotweed

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
www.pgparks.com<http://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<mailto: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>

________________________________
[Avast logo]<http://www.avast.com/>

This email has been checked for viruses by Avast antivirus software.
www.avast.com<http://www.avast.com/>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.maipc.org/pipermail/maipc-maipc.org/attachments/20150423/05465a16/attachment-0001.htm>