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Best Management Practices for Your Weed Control Program

Best Management Practices for Your Weed Control Program
Charles Gillam, Professor of Horticulture, Auburn University, Auburn, AL

Dr. Charles Gilliam is one of the leading weed scientists in the United States. He evaluates new chemicals for use in both container-grown and field-grown crops for many pesticide companies. Gilliam has worked with weed research for 30 years and has extensive experience in the nursery industry. He shares key principles of a good weed management program and new herbicide options now available.


Dr. Gilliam, Auburn University, studies herbicide efficacy in container-grown and field-grown nursery crops. Charles has a 75% Research, 25% Extension appointment in ornamental nursery crop production.

Weeds of Container Nurseries in the United States – Online ID Key

Weed control can be one of the most costly risks in the production of container-grown nursery crops. Any control program begins with the correct identification of the weeds present, along with an understanding of their life cycles and modes of reproduction and spread. Treated here are the most common weeds of outdoor container nurseries, as well as a selection of recently introduced species with the potential to spread. This work is based in large part on Weeds of Container Nurseries (Neal & Derr 2005), but builds on that treatment through the addition of multi-access keys, taxa, and images. The content is optimized for mobile use and should be accessible from standard browsers on nearly any device, whether desktop, tablet, or smartphone.

Access the key here:

Future. We consider this work a “living” resource and seek to continue to add images, tweak content, improve keys, etc. over time. Future versions will be identified by sequentially increasing version numbers.

Copyright. Re-use of any image in this work, for any purpose what-so-ever, is prohibited without the express written permission of the copyright owner. For permission to re-use any image, please contact the copyright owner directly.

“Bringing Nature Home”, sponsored by the Georgia Exotic Pest Plant Council

Do you care about protecting our native plant habitats from invasive plants? How can you tell which plants are invasive? Do you want to know how you can help? First step is to come to the Georgia Exotic Pest Plant Council Annual Conference on November 8th.

The GA-EPPC, Georgia Exotic Pest Plant Council, is having its Annual Meeting and Conference on Thursday, November 8th, 2012, from 9am to 4pm. The conference will be held at Stuckey Conference Center, UGA 1109 Experiment Street Griffin, Georgia.

GA-EPPC’s goals are to focus attention on the adverse effects invasive plants have on the diversity of Georgia’s native plants and animals; the use of invasive plant management to prevent habitat loss; the socioeconomic impacts of these plants; changes in the seriousness of the different invasive plants over time and the need to exchange information to help land owners and managers set priorities for invasive plant management.

For more information please visit

Alternatives to Synthetic Herbicides for Weed Management in Container Nurseries

Weed management is one of the most critical and costly aspects for container nursery production. High irrigation and fertilization rates create a favorable environment for weed growth in addition to crop growth. Weeds can quickly out-compete the crop for light and other resources, reducing the rate and amount of crop growth as well as salability (Berchielli-Robertson et al., 1990; Norcini and Stamps, 1992). Weed management in nursery production is most effectively achieved by preventative practices, primarily with the use of pre-emergent herbicides (Gilliam et al., 1990; Gallitano and Skroch, 1993).

However, there are valid reasons for managing weeds using alternatives to synthetic herbicides (Sidebar 1). Ornamental crops encompass a wide array of species, and herbicide products must be tested on each for effective, safe and legal use. Even when a product is labeled for a crop, it may not be sufficiently effective for the weeds present or may induce crop damage under certain circumstances. Finally, use of synthetic herbicides in greenhouses and other enclosed structures is often prohibited on product labels.

Check out the entire publication here.


FREE Book!!! – IPM for Select Deciduous Trees in Southeastern US Nursery Production

Southeastern nursery growers now have a new best friend when fighting pests and diseases. A new book, available in hard copy and iBook format for iPads, is now available, thanks to the Southern Nursery IPM Working Group.

The book—IPM for Select Deciduous Trees in Southeastern US Nursery Production—is a compilation of information about IPM for the major tree genera in nursery crop production in the southeast. The 320-page iBook covers sustainable management for insects, mites, disease, and weeds for the top-selling deciduous trees, as well as propagation and production information, genus by genus. The book demonstrates how each aspect of production can impact pest problems and management. Each chapter is centered on one crop, so answers to pest problems with “birch” or “dogwood” are easy to find.

The iBook includes movies illustrating techniques like grafting, hand-digging, and more as well as a custom glossary for terms specific to nursery production and pest management. While this resource is invaluable to nursery growers, landscapers, arborists, garden center owners, students and educators will also find it useful.

IPM for Select Deciduous Trees in Southeastern US Nursery Production was written by university Extension specialists in nursery production, plant pathology, entomology and weed science with partial support by the Southern Region IPM Center in Raleigh, NC.

Authors include extension specialists from the Southern Nursery IPM Working Group:

  • Craig Adkins, NC State University
  • S. Kris Braman, University of Georgia
  • Matthew Chappell, University of Georgia
  • Juang-Horng Chong, Clemson University
  • Jeffrey Derr, Virginia Tech
  • Winston Dunwell, University of Kentucky
  • Steven Frank, NC State University
  • Amy Fulcher, University of Tennessee
  • Frank Hale, University of Tennessee
  • William Klingeman, University of Tennessee
  • Gary Knox, University of Florida
  • Anthony LeBude, NC State University
  • Joseph Neal, NC State University
  • Mathews Paret, University of Florida
  • Nicole Ward, University of Kentucky
  • Sarah White, Clemson University
  • Jean Williams-Woodward, University of Georgia
  • Alan Windham, University of Tennessee
  • Jill Sidebottom, NC State University, guest author

To download the book to iTunes, search for IPM for Select Deciduous Trees in Southeastern US Nursery Production. To view or download the iBook chapter by chapter, go to

The iBook is formatted specifically for the iPad but can be downloaded as a pdf for viewing on any device. You can also view the book online from a computer or print it by chapter at the web address above. To request the book in hard copy, contact one of the authors or editors Amy Fulcher or Sarah for one of the limited print editions.


IR-4 Survey for Horticulture

The 2012/2013 Grower and Extension Survey is now available online. This survey is critical in deciding the IR-4 research priorities for ornamental horticulture. It outlines the pest management needs and will be a main component of the 2013 Workshop discussions.
As you fill out the questionaire, focus your thoughts on disease, pest, and weed problems that are difficult to manage because there are not enough pest management options. 
Please feel free to forward this survey to other interested people.
Thanks for helping IR-4 help the green industry!

Proper Use and Handling of Glyphosate in Plant Nurseries

A NEW publication by Shawn T. Steed and Robert H. Stamps at The University of Florida/IFAS


Glyphosate is the largest-selling single crop protection chemical worldwide (Woodburn 2000) and the most used herbicide in the nursery industry in the United States (Norcini et al. 1996). It is used for postemergent control of vegetation. Glyphosate is an extremely effective chemical that controls a broad spectrum of annual and perennial grasses, broadleaves, and sedges. This herbicide acts as an inhibitor of an enzyme that leads to the formation of several essential amino acids required for normal protein synthesis. Glyphosate has the ability to spread throughout the plant and concentrate in the growing regions where these amino acids are most needed for new growth. As a nonselective, translocating herbicide, it is easy to cause unintended damage to desirable vegetation if this product is used incorrectly. This publication outlines the proper use of glyphosate for plant producers and their employees.

Read the whole publication here:

IPM Pro App. Developed for Green Industry Professionals

A tour de force of nursery and landscape pest management, IPMPro mobile device app. will streamline your pest management decision-making, employee training, and make complying with state pesticide recordkeeping regulations easy!
Imagine having a leading expert send you a text to alert you about pests as they emerge and time-sensitive cultural tasks! Built by leading horticulture and pest management experts, IPMPro is like having an expert with you on the job every day!


IPM Pro can provide you with:

  • Major pest and cultural practices reference at your employees’ finger tips!
  • Automatic text-like alerts for time-sensitive pest issues and cultural practices -alert date adjusted specifically for your location!
  • Viewable as a calendar or chronological list of action items for easy reference!
  • Contains images, pest lifecycle, and management options for major pests of woody plants!
  • Provides pesticide recommendations for major diseases and insects!
  • Built-in pesticide recordkeeping to make outdoor, and on-the-go recordkeeping easy!
  • BONUS Weed content!

Check it out here:

2011 Archived Webinar Series – UGA Center for Urban Agriculture

Todd Hurt, UGA Center for Urban Agriculture Training Coordinator

Bodie Pennisi, UGA Extension Horticulture/Landscape Specialist

To watch archived presentations – click on the title for the month.

Visit for more details.

March 15th Pruning Tips for Professionals
Rick Smith, The Pruning Guru, LLC
April 5th Do’s and Don’ts of Color Beds
Bodie Pennisi, PhD., UGA Horticulture
May 10th “Building a Business Page in Facebook”
Geri Laufer, Horticulturist & Social Media Consultant
June 7th Turf Apps to make your phone “Smart”
Patrick McCullough, PhD., UGA Crops and Soils
July 12th Damage to Detection, Ornamental Insect Identification
Kris Braman, PhD. UGA Entomology
August 2nd Top 25 Weeds in the Landscape & How to Control Them
Mark Czarnota, PhD., UGA Horticulture
September 6th Getting Ready for Winter Color
Jenny Hardgrave, Simply Flowers, Inc.
October 4th Ask Extension
Agents and Specialists Answer Your Commercial Landscape Questions
November 1st Spanish Language & Culture for Landscape Managers
Rolando Orellana, UGA Center for Urban Agriculture
December 6th Understanding Pansy Fertilization
Paul Thomas, PhD., UGA Horticulture