Missouri Invasive Plant Task Force (MoIP) - to identify and control the invasive plant species that severely impact native biodiversity

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Citizen Science Opportunity: Shady Invaders through the National Phenology Network

by Tina Casagrand 0 Comments
Illustration from Nature's Notebook.

Illustration from Nature’s Notebook.

An invitation from Eryn Maynard to do Citizen Science:

I lived in St. Louis for a couple of years doing invasive plant research at Washington University. I went on a few native plant walks with your WGNSS-Botany Group. It came up in conversation fairly regularly that invasive shrubs tend to leaf out earlier and keep their leaves later than native shrubs. I’m now working on my PhD at Penn State exploring the occurrence and potential impacts of this extended leaf phenology of invasives. I’m trying to get a regional perspective on this, and so have started a citizen science data collection campaign called Shady Invaders through the National Phenology Network. The landing page contains the species lists and links on how to start collecting data. Datasheets can be printed or there’s also an app for mobile devices. Please help spread the word.

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Erynn Maynard, PhD Candidate

Intercollege Graduate Degree Program in Ecology

Forest Resources Building 220
Pennsylvania State University
University Park, PA 16802

[email protected]

Multiyear Study Evaluates Control Options for Swallowwort Vines

by Tina Casagrand 0 Comments

LAWRENCE, Kansas – April 5, 2016 – Scientists have just concluded a six-year study of potential controls for pale swallowwort and black swallowwort (Vincetoxicum spp.) – two perennial vines native to Europe that are invading habitats in northeastern North America.

To date, broad-spectrum herbicides have proved to be the most effective tool for managing the swallowworts. Many land managers, though, are concerned about the expense of herbicide treatments and the potential impact on native plant species in the areas being treated.

Researchers from Cornell University and the USDA Agricultural Research Service set out to determine whether defoliating swallowwort vines or mowing them would impact the growth, reproduction and survival of mature plants.

Researchers knew a long-term study would be needed to better predict results for a perennial plant like swallowwort. Their field experiments on the Cornell University campus documented six seasons of treatments of varying intensity.

They artificially defoliated swallowwort vines by 50 percent or 100 percent once or twice a year to simulate the impact of a leaf-feeding biological control agent. They also clipped vines once, twice or four times a year to simulate mowing.

In an article featured in the most recent edition of the journal Invasive Plant Science and Management, researchers say none of the swallowwort plants died as a result of defoliation or clipping, even at maximum treatment levels. Black swallowwort produced more above-ground biomass, while pale swallowwort produced more root biomass and root crown buds, compared to the other species.  Clipping four times per season did eliminate swallowwort seed, but it didn’t destroy mature plants. Plants receiving other damage treatments continued to produce seed and increase in size.

“The lack of success using defoliation and mowing over a multiyear period means land managers will likely need to continue to use herbicides in order to fight swallowwort infestations effectively,” says Lindsey Milbrath, Ph.D., of the USDA Agricultural Research Service, lead researcher for the project.

Full text of the article “Tolerance of Swallowworts (Vincetoxicum spp.) to Multiple Years of Artificial Defoliation and Clipping” is available in Volume 9, Issue 1 of the journal Invasive Plant Science and Management.

About Invasive Plant Science and Management

Invasive Plant Science and Management is a journal of the Weed Science Society of America, a nonprofit scientific society focused on weeds and their impact on the environment.  The publication focuses on invasive plant species. To learn more, visit www.wssa.net.