[MAIPC] Crab Apples Native Vx. Invasive

[Mike Van Clef]

Siebold's Crabapple is a fairly widespread invasive in NJ. Entire fields
can be taken over (like Callery Pear) and it's seedlings appear to be shade
tolerant enough to persist in forests. It is most abundant in the piedmont,
but plants can be found in low numbers throughout the state outside of the
Pine Barrens.

-Mike

Michael Van Clef, Ph.D.
Stewardship Director, Friends of Hopewell Valley Open Space
Program Director, New Jersey Invasive Species Strike Team
Principal, Ecological Solutions, LLC

Office: 609-730-1560
Mobile: 908-528-6674


On Thu, Dec 2, 2021 at 1:52 PM Pamela Roy <proy at appalachiantrail.org> wrote:

> Hi Patricia,
>
> I have seen Malus sieboldii
> <https://gobotany.nativeplanttrust.org/species/malus/sieboldii/> really
> spread across meadows here in southeast Pennsylvania- I would consider it
> invasive, but perhaps less so than Callery pear. There was a large mature
> planting on one side of our park, and we found it popping up in meadows
> across the park.  I have actively removed seedlings from the meadow and
> killed mature trees in the forested edges. This species is a little easier
> to identify due to the shape of the leaves, which is similar to hawthorns,
> especially on the seedlings. I wasn't aware of this finding of Tallamy's at
> the time.
>
> *Pamela Roy *(She/her/hers)
>
> *Visual Resource Inventory Project Manager *
>
> Appalachian Trail Conservancy
> Website: appalachiantrail.org
>
> Email: proy at appalachiantrail.org
>
> Phone: 267.485.5 <717.258.5771>930
> ------------------------------
> *From:* MAIPC <maipc-bounces at lists.maipc.org> on behalf of Greenberg,
> Patricia <Patricia.Greenberg at fairfaxcounty.gov>
> *Sent:* Thursday, December 2, 2021 1:26 PM
> *To:* Nathan Hartshorne <nshartshorne at gmail.com>
> *Cc:* MAIPC <maipc at lists.maipc.org>
> *Subject:* Re: [MAIPC] Crab Apples Native Vx. Invasive
>
> CAUTION: This email originated from outside of the organization. Do not
> click links or open attachments unless you recognize the sender and know
> the content is safe.
>
> Hi,
>
> Thanks, Nathan for the feedback. That is interesting to know about Doug
> Tallamy’s finding. So, if its not as invasive as other tree species like
> callery pear, are others here in agreement that it can be ignored for the
> most part? Has anyone found it to take over areas? I’ve only found it here
> and there and not dominating areas like callery pears tend to. Or is this
> an “it depends” conversation?
>
>
>
> Thank you,
>
>
>
>
> *Patricia Pearl Greenberg Ecologist II*
>
> *Invasive Management Area Program Manager*
>
> *Natural Resource Branch*
>
> *Fairfax County Park Authority*
>
> *Office: 703-324-8673*
>
> *Fax: 703-324-3996*
>
> patricia.greenberg at fairfaxcounty.gov
>
> *(She/Her)*
>
>
>
> *ISA Certified Arborist,* *MA-6067A*
>
> *ISA Tree Risk Assessment Qualified*
>
>
>
>
>
>
>
>
>
>
>
> *From:* Nathan Hartshorne <nshartshorne at gmail.com>
> *Sent:* Wednesday, December 1, 2021 1:39 PM
> *To:* Greenberg, Patricia <Patricia.Greenberg at fairfaxcounty.gov>
> *Cc:* MAIPC <maipc at lists.maipc.org>
> *Subject:* Re: [MAIPC] Crab Apples Native Vx. Invasive
>
>
>
> I've struggled with this as well and spent awhile trying to get it right
> and never got anywhere.  If I recall correctly, they hybridize, so it's a
> real spectrum that's hard to diagnose, and that one feature you mentioned
> didn't do much for me. It doesn't help that at least some native nurseries
> don't even seem to realize this is a thing and it's just "malus spp."  On
> the bright side, according to Tallamy, they are interchangeable as a host
> plant for caterpillars, at least in species numbers, if not volume of
> insects.
>
>
>
> On Wed, Dec 1, 2021 at 12:47 PM Greenberg, Patricia <
> Patricia.Greenberg at fairfaxcounty.gov> wrote:
>
> Hi,
>
>
>
> Can anyone on this email group help respond to these questions:
>
> How do we best distinguish the American native crabapples from Asian ones?
> According to Flora of Virginia, it looks like a main character is
> thorn-like branches coming off of the American ones. Is there a better
> “clincher” that you know of?
>
>
>
> Thank you,
>
>
>
>
> *Patricia Pearl Greenberg Ecologist II*
>
> *Invasive Management Area Program Manager*
>
> *Natural Resource Branch*
>
> *Fairfax County Park Authority*
>
> *Office: 703-324-8673*
>
> *Fax: 703-324-3996*
>
> patricia.greenberg at fairfaxcounty.gov
>
> *(She/Her)*
>
>
>
> *ISA Certified Arborist, **MA-6067A*
>
> *ISA Tree Risk Assessment Qualified*
>
>
>
>
>
>
>
>
>
>
>
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