[MAIPC] Incised fumewort infestations can be really bad

Thu Apr 27 07:25:54 PDT 2023

Hi folks,

If you’re like me, you have not been aware of the rapid growth of incised fumewort in the past few years.  Under Sara Tangren’s leadership the Nat Cap PRISM started tracking it this spring with our network of Invader Detectives.

It’s…everywhere, and it appears to be outcompeting or outright killing bluebells wherever they occur together.  USDA’s weed risk assessment for this species found no evidence for allelopathy in field tests, but that had high uncertainty.

Please click on the iNatualist entry below and look at the images.  It appears to occupy 1+ acres in Seneca Creek State Park in Montgomery County.  This is the largest population that we have found this year, but it appears to go from a few plants to a large population in only two or three seasons.

Have you been tracking this plant in your area?

Damien

Damien Ossi
Wildlife Biologist
Fisheries and Wildlife Division
Department of Energy and Environment
202-741-0840
damien.ossi at dc.gov<mailto:damien.ossi at dc.gov>

From: invaderdetectives at googlegroups.com<mailto:invaderdetectives at googlegroups.com> <invaderdetectives at googlegroups.com<mailto:invaderdetectives at googlegroups.com>> On Behalf Of Tangren, Sara (DOEE)
Sent: Monday, April 17, 2023 11:36 AM
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Subject: [InvaderDetectives] incised fumewort infestations can be really bad

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Hi All,

I’ve spent the last week helping combat an infestation at Hemlock Overlook Park (Bull Run watershed, VA). The appearance of what is going on there suggests that the plants are allelopathic, but only scientific tests could tell us for sure. To see the bluebells, violets, and spring beauties being overrun was heartbreaking. It took only 3 years to go from first observation to serious ecological damage and first response. We’ve got to react to this species more quickly from here on out.

Today I’m catching up on iNat reviews and came across this one by our own esummerbell. Her photos do an excellent job of capturing just how bad incised fumewort can get, please have a look.
[cid:DE295FD0-3B77-4F44-8C30-8F0A252DA195]
Incised Fumewort (Corydalis incisa)<https://www.inaturalist.org/observations/155117633>
inaturalist.org<https://www.inaturalist.org/observations/155117633>

I think we need to have a meeting this winter and develop a region wide (or nationwide) management plan, something large scale.

Best,
Sara

Sara A. Tangren, Ph.D.
Coordinator
National Capital PRISM
Department of Energy & Environment
Government of the District of Columbia
1200 First Sreet NE, Fifth Floor
Washington, DC 20002
sara.tangren at dc.gov<mailto:sara.tangren at dc.gov>

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