[MAIPC] Summer Invasives.

[Marc Imlay]

Reminder. If you saw a large patch of Japanese Stiltgrass die last year from
blight, it might be helpful to see if it continued , or even expanded this
year. Five Years ago at the 200 acre Swann Park in Charles County, MD,  a
20'x 30' patch was infected by the classic looking Bipolaris rust blight
after flower and it all died before seed formed. Marc

 

 

From: Marc Imlay [mailto:ialm at erols.com] 
Sent: Monday, August 29, 2016 9:47 AM
To: 'maipc at lists.maipc.org' <maipc at lists.maipc.org>
Subject: RE: [MAIPC] Summer Invasives.

 

Just to make it clear, the pre=emergent treatment recommended by Art Gover,
worked very well on Microstegium. The issue is massive new invasions at the
200 acres Swann Park in Charles County and 200 acres in two parks in Prince
Georges County in Maryland. 

 

Marc Imlay, PhD, Chair, MAIPC Biological control working Group Conservation
biologist, 

Park Ranger Office, Non-native Invasive Plant Control coordinator.
<mailto:Marc.Imlay at pgparks.com> Marc.Imlay at pgparks.com

(301) 442-5657 cell  Natural and Historical Resources Division

The  Maryland-National   Capital   Park  and Planning Commission

 

Marc Imlay, PhD 
Chair of the Biodiversity and Habitat Stewardship Committee for the Maryland
Chapter of the Sierra Club.

 

 

 

 

From: Marc Imlay [mailto:ialm at erols.com] 
Sent: Sunday, August 28, 2016 11:55 PM
To: 'Ellis, Michael' <Michael.Ellis at pgparks.com
<mailto:Michael.Ellis at pgparks.com> >; 'Art Gover' <aeg2 at psu.edu
<mailto:aeg2 at psu.edu> >; 'Stephen Hiltner' <stevehiltner at gmail.com
<mailto:stevehiltner at gmail.com> >
Cc: 'maipc at lists.maipc.org' <maipc at lists.maipc.org
<mailto:maipc at lists.maipc.org> >
Subject: RE: [MAIPC] Summer Invasives.

 

As Mike says,  many new patches formed from new invasions even though we
successfully used the pre-emergent treatment on mono-cultural patches of
Stiltgrass. Marc

 

 

From: MAIPC [mailto:maipc-bounces at lists.maipc.org] On Behalf Of Ellis,
Michael
Sent: Saturday, August 27, 2016 10:11 PM
To: Art Gover <aeg2 at psu.edu <mailto:aeg2 at psu.edu> >; Stephen Hiltner
<stevehiltner at gmail.com <mailto:stevehiltner at gmail.com> >
Cc: maipc at lists.maipc.org <mailto:maipc at lists.maipc.org> 
Subject: Re: [MAIPC] Summer Invasives.

 

Good to hear from you Art,

 

Have you compared quizalofop-P with clethodim in your work?  I've had great
success with clethodim this year at two of our parks against Microstegium,
even in August.

 

I noticed at the low rate I was applying clethodim, it wasn't killing
Dicantheliums, but was impacting Leersia virginica. We are all growing very
concerned Microstegium's success at dramatically increasing populations
annually despite time consuming control efforts each year.  At this point it
is colonizing rare habitats that we thought we could keep it out of if we
managed it every year, such as our Magnolia bogs.

I personally have all but abandoned trial attempts to manage Oplismenus
undulatifolius with grass specific or pre-emergent herbicides. Although both
work very well at killing or preventing first year plants, the second year
Oplismenus plants are harder to manage.

 

Regards,

 

Michael Ellis
Non-Native Invasive Plant Management Field Coordinator
Park Ranger Office, Natural and Historical Resources Division
The Maryland-National Capital Park and Planning Commission
weedwarriors at pgparks.com <mailto:weedwarriors at pgparks.com> 

240-429-5042

 

_____________________________
From: Art Gover <aeg2 at psu.edu <mailto:aeg2 at psu.edu> >
Sent: Saturday, August 27, 2016 9:51 PM
Subject: Re: [MAIPC] Summer Invasives.
To: Stephen Hiltner <stevehiltner at gmail.com <mailto:stevehiltner at gmail.com>
>
Cc: <maipc at lists.maipc.org <mailto:maipc at lists.maipc.org> >


We use the selective grass herbicide quizalofop-P (e.g. "Assure II") at its
lowest labeled rate, and find that stiltgrass is controlled while other
grasses such as Leersia virginica, Muhlenbergia scherberi, and Brachyelytrum
erectum are not affected, nor any dicots or non-grass monocots.

Be well.

Art

Penn State Wildland Weed Management
116 ASI Building
University Park, PA 16802

(814) 863-9904
(814) 863-7043 FAX
http://plantscience.psu.edu/wildland

> On Aug 27, 2016, at 11:17, Stephen Hiltner <stevehiltner at gmail.com
<mailto:stevehiltner at gmail.com> > wrote:
> 
> Sorry to hear. Perhaps development of a C4 pathway specific herbicide
would help, since stiltgrass is said to be one of the few C4 species that
grows in the shade? Googling brings up a few results--more than would come
up a few years ago.
> 
> On Sat, Aug 27, 2016 at 10:53 AM, MarneyB <marneyb at earthlink.net
<mailto:marneyb at earthlink.net> > wrote:
> On a walk recently on the River Trail at Great Falls MD I noticed that
Golden ragwort - Packera aurea - was able to deter Japanese Stiltgrass in an
area where this invasive and had taken to a large extent.
> 
> 
> 
> Marney
> 
> 
> 
> From: MAIPC [mailto:maipc-bounces at lists.maipc.org] On Behalf Of Marc Imlay
> Sent: Saturday, August 27, 2016 9:39 AM
> To: maipc at lists.maipc.org <mailto:maipc at lists.maipc.org> 
> Subject: [MAIPC] Summer Invasives.
> 
> 
> 
> I have found this year that the Japanese Stiltgrass is no longer
controllable over 400 acres of parkland in spites of extensive use of
pre-emergents in March. At the 200 acre Swann Park beefsteak is no longer
controllable. And many folks have found the same for Wavyleaf basketgrass. .
Twenty years ago it was very doable to save all our parks. So mid-late
Summer invasives is very sad, especially since stiltgrass is so totally
destructive and replaces the other ground vegetation. 
> 
> 
> 
> I remind myself that I have been successful with invasives for the rest of
the year including garlic mustard and Lesser Celandine. For the late Summer
invasives , biological control remains our best hope, both effective host
specific from Eurasia, etc. as well as waiting for native biological
controls to pop up as with Ailanthus after 200 years. .
> 
> 
> 
> From: Imlay, Marc 
> Sent: Thursday, August 25, 2016 10:08 AM
> To: 
> Subject: RE: Mniutes from August 2016 board meeting
> 
> 
> 
> A top issue for invasive plant control folks is should we continue to
remove all the Asiatic bittersweet, bush honeysuckle, juvenile garlic
mustard, Japanese barberry, porcelain berry, beefsteak, multi flora rose,
mimosa, wineberry, and mile-a minute. Or switch our resources to Japanese
Stilt grass and wavyleaf basket grass that have become so much more abundant
and destructive at our high priority sites.
> 
> 
> 
> 
> 
> Marc Imlay, PhD, Chair, MAIPC Biological control working Group
Conservation biologist, 
> 
> Park Ranger Office, Non-native Invasive Plant Control coordinator.
Marc.Imlay at pgparks.com <mailto:Marc.Imlay at pgparks.com> 
> 
> (301) 442-5657 cell Natural and Historical Resources Division
> 
> The Maryland-National Capital Park and Planning Commission
> 
> 
> 
> Marc Imlay, PhD 
> Chair of the Biodiversity and Habitat Stewardship Committee for the
Maryland Chapter of the Sierra Club.
> 
> 
> 
> 



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