[MAIPC] Microstegium versus Perilla, August 30 2020

[Randall, Johnny]

Glenn: I battle both of these species and am winning on Perilla and on Microstegium in upland patches. My answer to your question is to remove the plants before they flower, which is in the fall for both. (I never understand why so many wait until fall to do this, in a panic, given that there’s 6 months for removal prior to flowering and seed set!)

Johnny Randall

From: MAIPC <maipc-bounces at lists.maipc.org> On Behalf Of Glenn Tobin
Sent: Tuesday, October 13, 2020 1:43 PM
To: frazmo <frazmo at gmail.com>
Cc: APWG <apwg-bounces at lists.plantconservation.org>; MAIPC <maipc at lists.maipc.org>; Lily Fountain <lily.fountain at mdsierra.org>; INVASIVES at listserv.umd.edu
Subject: Re: [MAIPC] Microstegium versus Perilla, August 30 2020

Question for the group:  I work in an area where it is very difficult to bag up invasives and haul them out.  At this stage of the year, I run across perilla or microstegium that is obviously late in it's life cycle.  The question is:  At what stage do the seeds for these species become viable, so pulling the parent plant out literally would not reduce it's seed production?

Even if all the seeds will be viable, there still may be value in pulling-- it seems to me that creating a bundle and sticking it somewhere inhospitable will result in less spread than if they are out and being dragged around by every critter that passes by.  I find myself with the same question about long-bristled smartweed, Artemesia annua or vulgaris, and in the spring, garlic mustard.   Does anyone have an approach for deciding when is it better to just leave these standing and deal with them later?

Best regards,
Glenn Tobin

On Mon, Oct 5, 2020 at 3:07 PM frazmo <frazmo at gmail.com<mailto:frazmo at gmail.com>> wrote:
My recent observations of Perilla suggest it is spreading down floodplains very aggressively and may join Japanese Knotweed as a despoiler of stream and river banks. In Arlington VA we are seeing lush Perilla plants growing at least 3-5 feet tall, seeming to thrive on the floodplain soil and poised to produce enormous seed loads.

Steve Young

On Mon, Oct 5, 2020, 10:58 AM Kathleen Michels <michelskm2016 at gmail.com<mailto:michelskm2016 at gmail.com>> wrote:
I just see Perilla spreading EVERYWHERE! In addition to meadows and woods It's even in our Wheaton urban parking garage  garden far away and isolated by lots  of asphalt and concrete  from any gardens or natural areas. Like barberry it's the newest that is just t
exploding over every natural and non natural area  we look!

On Fri, Oct 2, 2020, 8:27 AM Marc Imlay <ialm at erols.com<mailto:ialm at erols.com>> wrote:
Reminder. If you see something, say something.

If you see a massive die off of Beefsteak Mint, please report it for potential biological control. Thank you

Marc

From: frazmo <frazmo at gmail.com<mailto:frazmo at gmail.com>>
Sent: Sunday, September 13, 2020 1:30 PM
To: Marc Imlay <ialm at erols.com<mailto:ialm at erols.com>>
Cc: MAIPC <maipc at lists.maipc.org<mailto:maipc at lists.maipc.org>>; INVASIVES at listserv.umd.edu<mailto:INVASIVES at listserv.umd.edu>
Subject: Re: [MAIPC] Microstegium versus Perilla, August 30 2020

Remember allelopathy! A quick web search seems to show there is some literature indicating that Perilla has allelopathic properties. That could help to explain  the how/why on the observations of Perilla patches appearing to outcompete Microstegium.

My quick peek also reminded me about the very alarming toxicity of Perilla. For example,  it is a serious poisoning hazard to livestock. I guess that may help to explain deer avoiding it.

Cheers, Steve Young, Arlington VA volunteer

On Fri, Sep 11, 2020, 3:34 PM Marc Imlay <ialm at erols.com<mailto:ialm at erols.com>> wrote:
Japanese stiltgrass is easy to pull out unlike many of the native competitors. One reason it grows fast is because it puts it’s energy into growing fast rather than maintaining strong roots. So how can we change things so that the native competitors outcompete stiltgrass because they have stronger roots?

Marc Imlay, PhD Conservation biologist,
Board member of the Mid-Atlantic Exotic Pest Plant Council, ,
Natural Places Committee for the Maryland Chapter of the Sierra Club

From: James Remuzzi <james at sustainablesolutionsllc.net<mailto:james at sustainablesolutionsllc.net>>
Sent: Monday, August 31, 2020 12:01 PM
To: Marc Imlay <ialm at erols.com<mailto:ialm at erols.com>>
Cc: MAIPC <maipc at lists.maipc.org<mailto:maipc at lists.maipc.org>>
Subject: Re: [MAIPC] Microstegium versus Perilla, August 30 2020

We also noticed this in the field Marc.

For whatever reason- Perrilla seems to outcompete JSG.


James R. Remuzzi
President
c:202-746-1649
o:855-478-7824
f: 202-706-6063
[https://docs.google.com/a/sustainablesolutionsllc.net/uc?id=0Bynd-1KX8zwzOXhYczVrdHlDLTQ&export=download]
sustainablesolutionsllc.net<http://sustainablesolutionsllc.net>



On Mon, Aug 31, 2020 at 8:37 AM Marc Imlay <ialm at erols.com<mailto:ialm at erols.com>> wrote:
Microstegium versus Perilla

I came across a huge mono-culture of Japanese stiltgrass about 25% of an acre. In the middle of the patch was a monoculture  patch of Beefsteak mint about 15 feet x 20 feet with almost no stiltgrass. There were two other beefsteak patches about 5 x 10 feet with no Microstegium. Is this just one non-native invasive outcompeting another one? Or is there another possibility that could be explored? For example, reintroduce Mentha arvenis. Any potential biocontrol?

Marc Imlay, PhD

Conservation biologist,
Board member of the Mid-Atlantic Exotic Pest Plant Council,
,
Natural Places Committee
for the Maryland Chapter of the Sierra Club.


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