Weed Science

The Weed Science Program develops educational programs and conducts applied research in weed biology and management for growers of vegetables, grapes, turf, and ornamentals in the field, containers, and in the landscape.


Growers and end-users of horticultural products are constantly confronted with potential loss of quality and economic value due to weed competition. Additionally, great concern about the potential contamination of the single source aquifer from which Long Island draws its drinking water has resulted in a desire to reduce pesticide use. The weed science program is continually evaluating new and alternative weed management methods to address these issues.

Program Summary

Applied Research: Investigate both traditional weed control approaches and alternative and cultural methods to address weed management problems through research.

Educational Extension: Disseminate information through articles in trade journals, illustrated lectures, fact sheets, weed identification gardens, and website contributions.

Contributing authors to several publications including two of the Cornell Pesticide Management Guides, for Commercial Production of Trees and Shrubs and for Production and Maintenance of Herbaceous Perennials.

Advisory: Advise legislative and municipal agencies such as the New York State Department of Transportation and the Long Island Invasive Species Management Area, a consortium developing an invasive species management plan for Long Island.


Andrew F. Senesac, Ph.D., Senior Extension Specialist
Irene Tsontakis-Bradley, Program Educator
613-727-3595, afs2@cornell.edu, it21@cornell.edu

Web Links

Pest Management Guide for Commercial Production and Maintenance of Trees and Shrubs

Pest Management Guide for Commercial Production and Maintenance of Herbaceous Perennials

Long Island Horticultural Research and Extension Center

Long Island Invasive Species Management Area

Selected Publications

Weed-suppressive Groundcovers Brochure

Roadside Vegetation Handbook Part 1 (pp. 1-43)

Roadside Vegetation Handbook Part 2 (pp. 44-86)

Weed Management Research CCE Suffolk 2013

Turf & Landscape Weed Update 2014

Weeds in the News

Weed of Interest: Crowdipper, CCE Suffolk Ag News, August 2014

Weed of Interest: Mugwort, CCE Suffolk Ag News, July 2014

Weed of Interest: Mile-a-minute Weed, CCE Suffolk Ag News, May 2014

Weed of Interest: Bittercress, CCE Suffolk Ag News, March 2014

Weeds To Watch For: Mulberry Weed, Hairy Crabweed (Fatoua villosa), CCE Suffolk Ag News, November 2013

Wagon Hoe! Weeds On Wheels May Be Coming To Your Neighborhood, CCE Suffolk Ag News, August 2013

Weed of Interest: Yellow Nutsedge, CCE Suffolk Ag News, June 2013

Solving Weed Problems In Pastures, CCE Suffolk Ag News, May 2013

Early Emerging Invasive Weeds Bear Watching, CCE Suffolk Ag News, April 2013

Horseweed (Marestail)-A Weed To Watch For In The Fall

Mobile Display of Live Invasive Weeds