The Long Island Invasive Species Management Area


LIISMA Specific Documents

2013-2015 Strategic Plan

2010-2011 Annual Report

2011-2012 Annual Report

2012-2013 Annual Report

2014 Annual Report

2014 Annual Workplan

2015 Annual Workplan

2015 Annual Report

Early Detection and Research of Low Abundance Invasive or Potentially Invasive Plant Species with LIISMA. 2012 Surveys by David Werier. (56mb pdf)

Perennial Pepperweed Management Plan, West Meadow Beach, Town of Brookhaven, 2013

Spotted Knapweed Demographic Study Final Report, SUNY Stony Brook

Natural Area Mapping and Inventory of Blood Root Valley, 2011–2012 Survey

Survey, mapping and assessment of invasive plant species at the Underhill Preserve, Nassau County

Project Funding Information


Ecological Information


Management Information

Test of goat grazing on woody invasive plant species

The Nature Conservancy 2005-2006

Long Island, New York

CLICK HERE for a presentation of a goat grazing project TNC carried out at the Suffolk County Farm in 2005-2005. The project was managed by Kathy Schwager, Bill Jacobs and Marilyn Jordan. Results were presented at the August 24, 2006 meeting of the Long Island Invasive Species Management Area (LIISMA).

Goats are great at eating woody plants, and will even eat the bark off of trees. They also eat some herbaceous plants, but first they eat woody species, then they move on to herbaceous plants in order of their gastronomic preference. Mugwort (Artemisia vulgaris) is down near the bottom of the goat menu. Swallow-wort (Cynanchum rossicum and C. louisae) are toxic. Grass cover tends to either increase slightly, or remain unchanged, as long as there are plenty of other plants to eat.

Goats eat more intensively "close to home" (i.e. location of water and shelter) than farther away.  Thus a long narrow pen like the one we used is not the ideal shape for uniform woody control, though good for seeing effects of browse along an intensity gradient. Browsing doesn't kill woody plants after just one summer of goat exposure, so when goats are removed the woodies (and other plants) grow back. Repeated browsing for a couple of years, or following one year of browse with herbicide in year two, would be required for permanent kill of woody plants (and possibly herbaceous perennials).

So goats are good for woody control in grasslands. Not good for forests where abundant deer already fill the goat niche much too well.

Marilyn J. Jordan, Ph.D.
Senior Conservation Scientist
The Nature Conservancy on Long Island
Uplands Farm Sanctuary
250 Lawrence Hill Rd.
Cold Spring Harbor, NY 11724 USA
(631) 367-3384 Ext. 121


California Invasive Plant Council Videos on Invasive Plant Management

These videos include information on Prevention, Mechanical and Herbicide Control

Michigan Best Control Practice Guides

These are fact sheets on the best ways to control common invasive plants