[MAIPC] Microstegium versus Perilla, August 30 2020

Tue Oct 13 10:43:12 PDT 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> 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>
> 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> 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>
>>> *Sent:* Sunday, September 13, 2020 1:30 PM
>>> *To:* Marc Imlay <ialm at erols.com>
>>> *Cc:* MAIPC <maipc at lists.maipc.org>; 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> 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>
>>> *Sent:* Monday, August 31, 2020 12:01 PM
>>> *To:* Marc Imlay <ialm at erols.com>
>>> *Cc:* MAIPC <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
>>>
>>> *sustainablesolutionsllc.net* <http://sustainablesolutionsllc.net>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> On Mon, Aug 31, 2020 at 8:37 AM Marc Imlay <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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