[MAIPC] [EXTERNAL] Re: Italian Arum

[Hughes, Jake A]

Sorry, Ruth!  Having spent many hours digging Arum italicum out of Mount Hamilton at the National Arboretum, I can attest to how formidable a foe it is.

If herbicides are an option, Mark Frey did some trials some time ago and had some success.  The publication can be found here:  https://bioone.org/journals/natural-areas-journal/volume-39/issue-3/043.039.0309/Controlling-Italian-Arum-Arum-italicum/10.3375/043.039.0309.full
Controlling Italian Arum (Arum italicum) - BIOONE<https://bioone.org/journals/natural-areas-journal/volume-39/issue-3/043.039.0309/Controlling-Italian-Arum-Arum-italicum/10.3375/043.039.0309.full>
: Arum italicum (Italian arum) is a perennial herbaceous geophyte native to parts of Europe, Russia, and northern Africa. It has spread outside of cultivation in northern Europe, Oceania, and the Americas. Leaves emerge in the fall and are shed in the early summer; inflorescences form in the spring and fruits ripen in mid-summer. Successful documented treatment options are limited. To test new ...
bioone.org

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From: MAIPC <maipc-bounces at lists.maipc.org> on behalf of Marc Imlay <ialm at erols.com>
Sent: Monday, March 1, 2021 9:16 AM
To: 'Ruth Douglas' <cvilleruth at gmail.com>
Cc: 'MAIPC Listserve' <maipc at lists.maipc.org>
Subject: [EXTERNAL] Re: [MAIPC] Italian Arum




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Just a reminder. Dig out when the soil is still wet after a rain for much better success. Marc



From: MAIPC <maipc-bounces at lists.maipc.org> On Behalf Of Randall, Johnny
Sent: Monday, March 01, 2021 8:54 AM
To: Jil Swearingen <jilswearingen at gmail.com>; Ruth Douglas <cvilleruth at gmail.com>
Cc: MAIPC Listserve <MAIPC at lists.maipc.org>
Subject: Re: [MAIPC] Italian Arum



Ruth: Jil is unfortunately correct! We haven’t found a herbicide treatment that works very well.



I recommend building a screening frame with the proper hardware cloth dimension for trapping tubers, but allowing soil to sift through. (I’m building some of these now for Ficaria verna diggings….) The only thing you’re putting in the trash is vegetation and not heavy soil.



Johnny



From: MAIPC <maipc-bounces at lists.maipc.org<mailto:maipc-bounces at lists.maipc.org>> On Behalf Of Jil Swearingen
Sent: Monday, March 1, 2021 8:43 AM
To: Ruth Douglas <cvilleruth at gmail.com<mailto:cvilleruth at gmail.com>>
Cc: MAIPC Listserve <MAIPC at lists.maipc.org<mailto:MAIPC at lists.maipc.org>>
Subject: Re: [MAIPC] Italian Arum



Ruth,



That plant is a monster. Italian arum is or was at the national arboretum (that's where I first got to know it about a decade ago). It's very hard to get rid of. It's best to dig plants up - you have to get ALL the underground tubers and bag and dispose of the material in a landfill. You could leave it in the bags for a while to let it rot before disposal. It would be best to remove most of the soil in the area where the plants are, if that's a possibility. That would help ensure removal of all tubers.



Here's a good fact sheet from the State of Washington.

https://www.nwcb.wa.gov/weeds/italian-arum<https://gcc02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.nwcb.wa.gov%2Fweeds%2Fitalian-arum&data=04%7C01%7Cjake_hughes%40nps.gov%7Cfd084f639f4140fb49d108d8dcbce3b2%7C0693b5ba4b184d7b9341f32f400a5494%7C0%7C0%7C637502051135977021%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=dz%2FfVXTT7hu9rAJ02j%2Fqsof6uQkcG2Sql4iJv%2BHh%2B6o%3D&reserved=0>



Thanks,



Jil





On Mon, Mar 1, 2021 at 8:33 AM Ruth Douglas <cvilleruth at gmail.com<mailto:cvilleruth at gmail.com>> wrote:

Help! A well-meaning person or persons planted Italian arum (Arum italicum) an unknown number of years ago at my church, and it's been spreading. I've seen the Maryland info on this plant (http://mdinvasives.org/iotm/nov-2015/<https://gcc02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fmdinvasives.org%2Fiotm%2Fnov-2015%2F&data=04%7C01%7Cjake_hughes%40nps.gov%7Cfd084f639f4140fb49d108d8dcbce3b2%7C0693b5ba4b184d7b9341f32f400a5494%7C0%7C0%7C637502051135986981%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=slKEwStVqGBeakLVKfi5PAjGFu2EM3oLSFYagrX7Dxk%3D&reserved=0>) and  it's discouraging about how to get rid of it.



However, no mention is made of tarping or laying black plastic on areas where it is spreading. Has anyone tried this, and if so, with what success? I know its underground structures can be fairly deep, but does that preclude use of this technique?



Any advice is welcome.



Thanks.



Ruth Douglas

Charlottesville, VA

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