[MAIPC] spotted knapweed in the east

[Reid, Alyssa (PARKS)]

Hi All,

Spotted knapweed and its related species (particularly brown and meadow) are pretty well established in much of NY State (but not all of it). As others have mentioned, it is very common on roadsides, power line right of ways, heavily disturbed areas like shale pits and old farm fields.

Through the USDA APHIS, State Parks gets annual releases of biocontrol agents for spotted knapweed. Most of the releases thus far are in Minnewaska State Park Preserve, located in the Hudson Valley just south of the Catskills. At Minnewaska SPP the knapweed occurs densely in a shale pit and in a historically disturbed field. Both of those areas have experienced knapweed population decline after releases of two species of two seed head eating weevils, Larinus obtusus and Larinus minutus. Minnewaska also hosts the only NY established population of the root boring weevil, Cyphocleonus achates. The Urophora fly, while not formally released (at least recently), is present on most knapweed populations I’ve seen.

Prior to releasing biocontrols for knapweed it is very important to correctly identify exactly which species of knapweed you have. Many of them appear very similar at first glance, but biocontrol agents often prefer one species over another, so a correct ID is the first step.

Alyssa

Alyssa Reid
Invasive Species Project Coordinator
NYS Office of Parks, Recreation and Historic Preservation
PO Box 893
New Paltz, NY 12561
845-256-0579
Alyssa.Reid at parks.ny.gov<mailto:Alyssa.Reid at parks.ny.gov>

Follow the Nature Times blog for news about wildlife, projects, and events in our Parks!
http://nysparksnaturetimes.com/





From: MAIPC [mailto:maipc-bounces at lists.maipc.org] On Behalf Of Todd Hagenbuch
Sent: Friday, August 14, 2015 7:35 AM
To: Bryan Dolney; Grund, Steve; Hough-Goldstein, J A; MA-IPC Listserve
Subject: Re: [MAIPC] spotted knapweed in the east

Bryan:

I have seen spotted knapweed throughout parts of Pennsylvania for the past 15 years, not too uncommon in roadside areas.  In meadow situations, Milestone herbicide works great to control Spotted Knapweed.  Milestone should be applied at 7 ozs per acre + Clean cut surfactant at 1 qt per 100 gallons per 100 gallons of water.  We sell Milestone here at Arborchem in 1 qt containers and 2.5 gallon containers.  Caution should be used when spraying Milestone in root zones of black locust trees or where the spray could drift into canopy of locust trees.

Best Regards,


Todd Hagenbuch
Vegetation Management Specialist
Arborchem Products
133 Portsmouth Circle
Glen Mills, PA 19342
570-401-7098
thagenbuch at arborchem.com<mailto:thagenbuch at arborchem.com>
www.arborchem.com<http://www.arborchem.com/>



From: MAIPC [mailto:maipc-bounces at lists.maipc.org] On Behalf Of Bryan Dolney
Sent: Thursday, August 13, 2015 2:31 PM
To: Grund, Steve; Hough-Goldstein, J A; MA-IPC Listserve
Subject: Re: [MAIPC] spotted knapweed in the east

We have spotted knapweed in a meadow site in Pittsburgh Pennsylvania. It is a new population that is still small.

Bryan Dolney
Field Ecologist
Pittsburgh Parks Conservancy
45 South 23rd Street · Suite 101 · Pittsburgh, PA 15203-2120




From: MAIPC [mailto:maipc-bounces at lists.maipc.org] On Behalf Of Grund, Steve
Sent: Thursday, August 13, 2015 12:20 PM
To: Hough-Goldstein, J A; MA-IPC Listserve
Subject: Re: [MAIPC] spotted knapweed in the east

Spotted knapweed is a problematic invasive species in dry open habitats in Pennsylvania. Shale barrens, xeric limestone prairies, etc.

Steve Grund
Botanist
Natural Heritage Program, Western Pennsylvania Conservancy
800 Waterfront Drive
Pittsburgh, PA 15222
(412) 586-2350
www.paconserve.org<http://www.paconserve.org>

From: MAIPC [mailto:maipc-bounces at lists.maipc.org] On Behalf Of Hough-Goldstein, J A
Sent: Wednesday, July 01, 2015 10:29 AM
To: MA-IPC Listserve
Subject: [GRAYMAIL] [MAIPC] spotted knapweed in the east

All,
I am working on adding spotted knapweed to the list of invasive plants in the Mid-Atlantic that have biocontrol insects available for release, but the vast majority of published work deals with infestations in western rangelands. The implication seems to be that it rarely becomes invasive in the east, but maybe that is changing.
Does anyone know of (1) infestations of knapweed in particular habitats in the east or (2) any states in the eastern US that have released biocontrol insects targeting this species?
Thanks,
Judy
____________________________
Judy Hough-Goldstein, Professor
Dept. Entomology & Wildlife Ecology
University of Delaware, Newark DE 19716
Phone: (302) 831-2529
E-mail: jhough at udel.edu<mailto:jhough at udel.edu>
http://canr.udel.edu/faculty/hough-goldstein-judy/



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