[MAIPC] Microstegium versus Perilla, August 30 2020

[frazmo]

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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