[MAIPC] Crab Apples Native Vx. Invasive

[Pamela Roy]

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<https://appalachiantrail.org>

Email: proy at appalachiantrail.org<mailto:proy at appalachiantrail.org>

Phone: 267.485.5<tel: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

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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<mailto: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<mailto: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<mailto:patricia.greenberg at fairfaxcounty.gov>

(She/Her)



ISA Certified Arborist, MA-6067A

ISA Tree Risk Assessment Qualified











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