Getting Rid Of Weeds
Through Integrated Weed Management

We are a publicly led network coordinating research and outreach, providing science-based information and decision support tools to make agriculture more sustainable and precise. We work to develop integrated weed management solutions that are practical and adoptable.

No Seeds. No Weeds.

For over 50 years, herbicides have been a highly effective method to control weeds and protect crop yields. Herbicides have supported the wide-spread use of no-till and limited cultivation for weed control, improving soil health. However, over reliance on a few key herbicides has caused the development of particularly problematic herbicide-resistant weeds.

For some farmers, herbicides alone just aren’t getting the job done anymore.

Integrated Weed Management (IWM) is the answer.

Prevention Cultural Chemical Biological Mechanical IWM

What is Integrated Weed Management?

Integrated weed management (IWM) combines various methods to reduce or eliminate the effect of weeds on crop production over time, using a combination of practices that are most effective for solving specific weed issues. Techniques include:

Recent IWM News

Tillage, weed control, and the weed seedbank.

  October 4, 2021   Grow IWM
Tillage is used primarily to prepare the soil for planting.  But tillage can have other impacts including destroying...
  Grow News      Mechanical Weed Control      featured   

NCSU researchers use drones to identify Italian ryegrass seedlings in wheat

  September 9, 2021   Grow IWM
Italian ryegrass is an herbicide-resistant weed infesting many winter wheat fields in the eastern US, including North Carolina. ...
  Grow News      featured   

How to Get Rid Of Weeds with multiple tactic layers

  May 4, 2021   Grow IWM
Dr. Ramon Leon, North Carolina State University Extension and Research Weed Scientist, discusses how to manage winter and summer...
  Grow News      Herbicide Resistant Weeds      Cover Crops      featured   

Mid-Atlantic Workshop on Herbicide-Resistance Went Virtual This Year

  December 18, 2020   Grow IWM
A two-part workshop on herbicide-resistant weeds was held jointly with University of Maryland, Virginia Tech, and University of...
  Grow News      Harvest Weed Seed Control      Herbicide Resistant Weeds      Cover Crops      featured   

Turning the combine from a weed spreader into a weed predator

  November 20, 2020   Grow IWM
Dr. Michael Flessner, Extension Weed Specialist at Virginia Tech, discusses his work with Shockley Farms in Northampton Co....
  Grow News      Harvest Weed Seed Control      Herbicide Resistant Weeds      featured   

Killing weed seeds at harvest: a seed impact mill is now a reality in Virginia

  October 16, 2020   Grow IWM
A Redekop Seed Control Unit was installed on a John Deere S680 combine at Shockley Farms, near Cape Charles, VA. Bill Shockley is...
  Harvest Weed Seed Control      Mechanical Weed Control      featured   

Guidance for Building and Installing a Chaff Lining Prototype to a Combine

  October 8, 2020   Grow IWM
Based on a JD9500 combine, researchers from the University of Delaware developed a chaff lining prototype. Building and...
  Grow News      Harvest Weed Seed Control      featured   

On-farm Chaff Lining Field Results

  October 1, 2020   Claudio Rubione
At harvest, you may discover that weeds have escaped your control efforts and are setting seeds. These escaped weeds can create...
  Harvest Weed Seed Control      featured   

Plan Your Cover Crops For Weed Suppression

  September 17, 2020   Grow IWM
When it’s time to plan your cover crops for weed suppression, choosing the right planting timing as well as the right type of...
  Grow News      Cover Crops      featured   

Consider Managing Escaped Weeds Prior to Harvest

  August 27, 2020   Grow IWM
About to harvest? The soil seedbank serves as the source of next season’s weed problems. Weed seeds in the soil were deposited...
  Grow News      Harvest Weed Seed Control   

Muthu Bagavathiannan, Texas A&M Weed Scientist, shares what he learned from Australian farmers

  June 2, 2020   Grow IWM
In a recent visit to Western Australia, GROW Team members learned first hand from Australian growers, how are they successfully...
  Grow News      Harvest Weed Seed Control   

Managing Italian ryegrass in wheat with integrated weed management

  May 26, 2020   Grow IWM
At this point in the season, small grain farmers have won or lost the battle with Italian ryegrass. But all may not be lost....
  Grow News      Harvest Weed Seed Control      featured   

How to Get Rid Of Weeds with multiple tactic layers

  May 4, 2021   Grow IWM
Dr. Ramon Leon, North Carolina State University Extension and Research Weed Scientist, discusses how to manage winter and summer...
  Grow News      Herbicide Resistant Weeds      Cover Crops      featured   

Mid-Atlantic Workshop on Herbicide-Resistance Went Virtual This Year

  December 18, 2020   Grow IWM
A two-part workshop on herbicide-resistant weeds was held jointly with University of Maryland, Virginia Tech, and University of...
  Grow News      Harvest Weed Seed Control      Herbicide Resistant Weeds      Cover Crops      featured   

Plan Your Cover Crops For Weed Suppression

  September 17, 2020   Grow IWM
When it’s time to plan your cover crops for weed suppression, choosing the right planting timing as well as the right type of...
  Grow News      Cover Crops      featured   

Using “Planting Green” to Help Manage Weeds

  May 9, 2020   Grow IWM
Planting green allows the cover crops to grow for an additional few weeks and allows them to produce more biomass.  The...
  Grow News      Cover Crops      featured   

What is the Best Way to Terminate a Cover Crop?

  April 13, 2020   Grow IWM
Cover crop termination should be considered in advance when choosing a cover crop. Select a cover crop based on your cropping...
  Grow News      Cover Crops      featured   
GROW Members Learn How Australian Farmers Are Managing Weeds

GROW Members Learn How Australian Farmers Are Managing Weeds

  March 23, 2020   Grow IWM
Dr. Steven Mirsky, Research Ecologist at the USDA-ARS, MD, explains what GROW members learned regarding harvest weed seed control...
  Grow News      Harvest Weed Seed Control      Integrated Weed Management Innovations      Herbicide Resistant Weeds      Cover Crops      Harvest Weed Seed Management   

Cotton Weed Management With a Cereal Rye Cover Crops

  February 5, 2020   Grow IWM
Weed management in cotton has become more challenging due to an increase in herbicide-resistant weeds, such as horseweed and...
  Grow News      Cover Crops   

Cover crops: Country-Wide Conclusions

  January 22, 2020   Grow IWM
Several coordinated field trials are being conducted across the US to examine the benefit of cover crops for weed management. No...
  Grow News      Cover Crops   

Cover Crops for Weed Suppression. Are They an Option for Texas Growers?

  May 7, 2019   Grow IWM
Texas A&M weed specialists are working hard to help farmers in Southeast Texas manage herbicide-resistant weeds using cover...
  Grow News      Cover Crops   

Would You Like to Suppress Weeds with Cover Crops? See what happens by terminating them at different dates

  November 21, 2018   Grow IWM
Cover crops can play a significant role in a multi-tactic approach to weed management. Dr. Norsworthy with the University of...
  Grow News      Integrated Weed Management Innovations      Herbicide Resistant Weeds      Cover Crops   

Cover crop strategy for Weed Suppression=HIGH BIOMASS

  September 7, 2018   Grow IWM
Now is the time to think about planning your cover crops if you would like to “add” a different weed management...
  Grow News      Integrated Weed Management Innovations      Herbicide Resistant Weeds      Cover Crops   

Tillage, weed control, and the weed seedbank.

  October 4, 2021   Grow IWM
Tillage is used primarily to prepare the soil for planting.  But tillage can have other impacts including destroying...
  Grow News      Mechanical Weed Control      featured   

NCSU researchers use drones to identify Italian ryegrass seedlings in wheat

  September 9, 2021   Grow IWM
Italian ryegrass is an herbicide-resistant weed infesting many winter wheat fields in the eastern US, including North Carolina. ...
  Grow News      featured   

How to Get Rid Of Weeds with multiple tactic layers

  May 4, 2021   Grow IWM
Dr. Ramon Leon, North Carolina State University Extension and Research Weed Scientist, discusses how to manage winter and summer...
  Grow News      Herbicide Resistant Weeds      Cover Crops      featured   

Mid-Atlantic Workshop on Herbicide-Resistance Went Virtual This Year

  December 18, 2020   Grow IWM
A two-part workshop on herbicide-resistant weeds was held jointly with University of Maryland, Virginia Tech, and University of...
  Grow News      Harvest Weed Seed Control      Herbicide Resistant Weeds      Cover Crops      featured   

Turning the combine from a weed spreader into a weed predator

  November 20, 2020   Grow IWM
Dr. Michael Flessner, Extension Weed Specialist at Virginia Tech, discusses his work with Shockley Farms in Northampton Co....
  Grow News      Harvest Weed Seed Control      Herbicide Resistant Weeds      featured   

Guidance for Building and Installing a Chaff Lining Prototype to a Combine

  October 8, 2020   Grow IWM
Based on a JD9500 combine, researchers from the University of Delaware developed a chaff lining prototype. Building and...
  Grow News      Harvest Weed Seed Control      featured   

Plan Your Cover Crops For Weed Suppression

  September 17, 2020   Grow IWM
When it’s time to plan your cover crops for weed suppression, choosing the right planting timing as well as the right type of...
  Grow News      Cover Crops      featured   

Consider Managing Escaped Weeds Prior to Harvest

  August 27, 2020   Grow IWM
About to harvest? The soil seedbank serves as the source of next season’s weed problems. Weed seeds in the soil were deposited...
  Grow News      Harvest Weed Seed Control   

Muthu Bagavathiannan, Texas A&M Weed Scientist, shares what he learned from Australian farmers

  June 2, 2020   Grow IWM
In a recent visit to Western Australia, GROW Team members learned first hand from Australian growers, how are they successfully...
  Grow News      Harvest Weed Seed Control   

Managing Italian ryegrass in wheat with integrated weed management

  May 26, 2020   Grow IWM
At this point in the season, small grain farmers have won or lost the battle with Italian ryegrass. But all may not be lost....
  Grow News      Harvest Weed Seed Control      featured   
Row Spacing As A Weed Management Tool

Row Spacing As A Weed Management Tool

  May 15, 2020   Claudio Rubione
Crop competition is key to good weed control, and a thick dense crop canopy will serve to suppress weeds for most of the growing...
  Grow News      featured   

Using “Planting Green” to Help Manage Weeds

  May 9, 2020   Grow IWM
Planting green allows the cover crops to grow for an additional few weeks and allows them to produce more biomass.  The...
  Grow News      Cover Crops      featured   

How to Get Rid Of Weeds with multiple tactic layers

  May 4, 2021   Grow IWM
Dr. Ramon Leon, North Carolina State University Extension and Research Weed Scientist, discusses how to manage winter and summer...
  Grow News      Herbicide Resistant Weeds      Cover Crops      featured   

Mid-Atlantic Workshop on Herbicide-Resistance Went Virtual This Year

  December 18, 2020   Grow IWM
A two-part workshop on herbicide-resistant weeds was held jointly with University of Maryland, Virginia Tech, and University of...
  Grow News      Harvest Weed Seed Control      Herbicide Resistant Weeds      Cover Crops      featured   

Turning the combine from a weed spreader into a weed predator

  November 20, 2020   Grow IWM
Dr. Michael Flessner, Extension Weed Specialist at Virginia Tech, discusses his work with Shockley Farms in Northampton Co....
  Grow News      Harvest Weed Seed Control      Herbicide Resistant Weeds      featured   
GROW Members Learn How Australian Farmers Are Managing Weeds

GROW Members Learn How Australian Farmers Are Managing Weeds

  March 23, 2020   Grow IWM
Dr. Steven Mirsky, Research Ecologist at the USDA-ARS, MD, explains what GROW members learned regarding harvest weed seed control...
  Grow News      Harvest Weed Seed Control      Integrated Weed Management Innovations      Herbicide Resistant Weeds      Cover Crops      Harvest Weed Seed Management   

Would You Like to Suppress Weeds with Cover Crops? See what happens by terminating them at different dates

  November 21, 2018   Grow IWM
Cover crops can play a significant role in a multi-tactic approach to weed management. Dr. Norsworthy with the University of...
  Grow News      Integrated Weed Management Innovations      Herbicide Resistant Weeds      Cover Crops   
Robotics

Robotics: A New IWM Tool In The Pipeline

  November 2, 2018   Grow IWM
Scientists at the University of Illinois at Urbana-Champaign are working on research funded by the U.S. Department of Agriculture...
  Grow News      Integrated Weed Management Innovations      Herbicide Resistant Weeds   

Harvest Time: Prevent Weed Seed Dispersal, A SIMPLE PLAN

  October 9, 2018   Grow IWM
Farmers are very busy during harvest time. Yet this is the final time to do something about the weeds in the field. If weeds and...
  Grow News      Integrated Weed Management Innovations      Herbicide Resistant Weeds      Harvest Weed Seed Management   

How to Interpret Herbicide Mode of Action?

  October 8, 2018   Grow IWM
Combating herbicide resistance requires combining herbicide modes of action. Re-posted from the Texas Row Crops Newsletter, July...
  Integrated Weed Management Innovations      Herbicide Resistant Weeds   

Cover crop strategy for Weed Suppression=HIGH BIOMASS

  September 7, 2018   Grow IWM
Now is the time to think about planning your cover crops if you would like to “add” a different weed management...
  Grow News      Integrated Weed Management Innovations      Herbicide Resistant Weeds      Cover Crops   

Cleaning Weed Seeds from a Combine – Video

  December 5, 2017   Grow IWM
Annie Klodd and Jeff Metz, Pennsylvania State University Equipment that enters a field with mature herbicide-resistant weeds will...
  Grow News      Harvest Weed Seed Control      Integrated Weed Management Innovations      Herbicide Resistant Weeds   

Raising weeds for science – researchers study when weeds shed their seeds

  September 19, 2017   Grow IWM
Last week, we wrote an article on Harvest Weed Seed Control using the Harrington Seed Destructor (HSD). This effective machine...
  Harvest Weed Seed Control      Herbicide Resistant Weeds   

Herbicide rotation ineffective against resistance in waterhemp

  September 6, 2017   Grow IWM
Lauren Quinn, University of Illinois URBANA, Ill. – Farmers have been battling herbicide-resistant weeds for generations. A...
  Herbicide Resistant Weeds   

Mid-Atlantic Workshop on Herbicide-Resistance Went Virtual This Year

  December 18, 2020   Grow IWM
A two-part workshop on herbicide-resistant weeds was held jointly with University of Maryland, Virginia Tech, and University of...
  Grow News      Harvest Weed Seed Control      Herbicide Resistant Weeds      Cover Crops      featured   

Turning the combine from a weed spreader into a weed predator

  November 20, 2020   Grow IWM
Dr. Michael Flessner, Extension Weed Specialist at Virginia Tech, discusses his work with Shockley Farms in Northampton Co....
  Grow News      Harvest Weed Seed Control      Herbicide Resistant Weeds      featured   

Killing weed seeds at harvest: a seed impact mill is now a reality in Virginia

  October 16, 2020   Grow IWM
A Redekop Seed Control Unit was installed on a John Deere S680 combine at Shockley Farms, near Cape Charles, VA. Bill Shockley is...
  Harvest Weed Seed Control      Mechanical Weed Control      featured   

Guidance for Building and Installing a Chaff Lining Prototype to a Combine

  October 8, 2020   Grow IWM
Based on a JD9500 combine, researchers from the University of Delaware developed a chaff lining prototype. Building and...
  Grow News      Harvest Weed Seed Control      featured   

On-farm Chaff Lining Field Results

  October 1, 2020   Claudio Rubione
At harvest, you may discover that weeds have escaped your control efforts and are setting seeds. These escaped weeds can create...
  Harvest Weed Seed Control      featured   

Consider Managing Escaped Weeds Prior to Harvest

  August 27, 2020   Grow IWM
About to harvest? The soil seedbank serves as the source of next season’s weed problems. Weed seeds in the soil were deposited...
  Grow News      Harvest Weed Seed Control   

Muthu Bagavathiannan, Texas A&M Weed Scientist, shares what he learned from Australian farmers

  June 2, 2020   Grow IWM
In a recent visit to Western Australia, GROW Team members learned first hand from Australian growers, how are they successfully...
  Grow News      Harvest Weed Seed Control   

Managing Italian ryegrass in wheat with integrated weed management

  May 26, 2020   Grow IWM
At this point in the season, small grain farmers have won or lost the battle with Italian ryegrass. But all may not be lost....
  Grow News      Harvest Weed Seed Control      featured   
Eric Westra

Eric Westra, Colorado State Weed Specialist, Evaluates Weed Management Potential at Harvest

  May 8, 2020   Grow IWM
Dr. Eric Westra, Colorado State Weed Specialist, evaluates which Harvest Weed Seed Control tools could potentially be adopted by...
  Uncategorized      Grow News      Harvest Weed Seed Control   
Grain Sorghum

Integrating Tactics For Johnsongrass Management in Grain Sorghum

  April 28, 2020   Grow IWM
Johnsongrass is a major problem in summer annual crops, especially in grain sorghum due to the lack of selective herbicide...
  Grow News      Harvest Weed Seed Control      featured   

Lauren Lazaro, LSU AgCenter, sees the potential of Harvest Weed Seed Control in Louisiana

  April 2, 2020   Grow IWM
Dr. Lauren Lazaro, LSU AgCenter’s Weed Specialist, visited Australian farmers and learned how they are dealing with...
  Grow News      Harvest Weed Seed Control   
GROW Members Learn How Australian Farmers Are Managing Weeds

GROW Members Learn How Australian Farmers Are Managing Weeds

  March 23, 2020   Grow IWM
Dr. Steven Mirsky, Research Ecologist at the USDA-ARS, MD, explains what GROW members learned regarding harvest weed seed control...
  Grow News      Harvest Weed Seed Control      Integrated Weed Management Innovations      Herbicide Resistant Weeds      Cover Crops      Harvest Weed Seed Management   

In the Fields

What Are Your Problem Weeds?

Waterhemp
Giant Ragweed
Italian Ryegrass
Barnyardgrass
Johnsongrass
Redroot Pigweed
Smooth Pigweed
Common Ragweed
Common Lambsquarters
Horseweed (marestail)
Palmer Amaranth