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

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...
  Cover Crops      featured      Grow News   

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...
  Cover Crops      featured      Grow News   
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...
  Cover Crops      Grow News      Harvest Weed Seed Control      Harvest Weed Seed Management      Herbicide Resistant Weeds      Integrated Weed Management Innovations   

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...
  Cover Crops      Grow News   

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...
  Cover Crops      Grow News   

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...
  Cover Crops      Grow News   

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...
  Cover Crops      Grow News      Herbicide Resistant Weeds      Integrated Weed Management Innovations   

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...
  Cover Crops      Grow News      Herbicide Resistant Weeds      Integrated Weed Management Innovations   

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....
  featured      Grow News      Harvest Weed Seed Control   
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...
  featured      Grow News   

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...
  Cover Crops      featured      Grow News   
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...
  Grow News      Harvest Weed Seed Control      Uncategorized   
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...
  featured      Grow News      Harvest Weed Seed Control   

Effective Site of Action and How it Should Be Used

  April 27, 2020   Grow IWM
When it comes to choosing the right herbicide, it might be useful and important to refresh how to use different and multiple...
  featured      Grow News   

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...
  Cover Crops      featured      Grow News   

Does Strategic Tillage for Weed Control Make Sense in No-Till Cropping Systems?

  April 13, 2020   Grow IWM
Strategic tillage, as defined in a recent article from the University of Nebraska, is occasional tillage of long-term no-till,...
  Grow News      Integrated Weed Management Innovations      Mechanical Weed Control   

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...
  Cover Crops      Grow News      Harvest Weed Seed Control      Harvest Weed Seed Management      Herbicide Resistant Weeds      Integrated Weed Management Innovations   

How did Palmer amaranth and Waterhemp get in NC?

  February 12, 2020   Grow IWM
Depending on the species, weeds spread with the help of wind, water, or by other means. Additionally, people spread weeds with...
  Grow News      Prevention   
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...
  Cover Crops      Grow News      Harvest Weed Seed Control      Harvest Weed Seed Management      Herbicide Resistant Weeds      Integrated Weed Management Innovations   

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...
  Cover Crops      Grow News      Herbicide Resistant Weeds      Integrated Weed Management Innovations   
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      Herbicide Resistant Weeds      Integrated Weed Management Innovations   

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      Harvest Weed Seed Management      Herbicide Resistant Weeds      Integrated Weed Management Innovations   

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...
  Herbicide Resistant Weeds      Integrated Weed Management Innovations   

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...
  Cover Crops      Grow News      Herbicide Resistant Weeds      Integrated Weed Management Innovations   

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      Herbicide Resistant Weeds      Integrated Weed Management Innovations   

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   

Weed of the Week: Giant Foxtail

  June 12, 2017   Grow IWM
Giant foxtail is a common summer annual grass in row crops and forages. It emerges for a long period in the spring. It typically...
  Herbicide Resistant Weeds   

Soybean Burndown – If you Haven’t Sprayed Yet, Good Luck

  May 16, 2017   Grow IWM
Some weeds, like horseweed/marestail, can be very hard to control in POST if they’re not controlled prior to planting. If...
  Herbicide Resistant Weeds      Integrated Weed Management Innovations   

Weed of the Week: Johnsongrass

  May 16, 2017   Grow IWM
Johnsongrass is a widespread perennial grass weed throughout the US, with herbicide resistant populations in the midwest, south,...
  Herbicide Resistant Weeds      Integrated Weed Management Innovations   

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....
  featured      Grow News      Harvest Weed Seed Control   
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...
  Grow News      Harvest Weed Seed Control      Uncategorized   
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...
  featured      Grow News      Harvest Weed Seed Control   

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...
  Cover Crops      Grow News      Harvest Weed Seed Control      Harvest Weed Seed Management      Herbicide Resistant Weeds      Integrated Weed Management Innovations   

A NEW Harvest Weed Seed Control Tool from Tecfarm

  February 25, 2020   Grow IWM
In December 2019, members of GROW visited Western Australia to learn first-hand about harvest weed seed control. Machinery...
  Harvest Weed Seed Control      News From Other Sources   

Harrington Seed Destructor Kills Nearly 100 Percent of US Agronomic Weed Seeds in Lab Study

  January 31, 2020   Grow IWM
https://phys.org/news/2020-01-harrington-seed-destructor-percent-agronomic.html By University of Illinois, Urbana-Champaign In...
  Harvest Weed Seed Control      Harvest Weed Seed Management      Mechanical Weed Control      News From Other Sources   

Managing Weed Seed Bank at Harvest

  September 5, 2018   Grow IWM
Over the past two years a new IWM  tool has been tested at three locations in the US as part of the GROW-IWM project. ...
  Grow News      Harvest Weed Seed Control      Integrated Weed Management Innovations   

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      Herbicide Resistant Weeds      Integrated Weed Management Innovations   

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   

Harrington Seed Destructor Field Day at University of Illinois

  September 7, 2017   Grow IWM
The Harrington Seed Destructor (HSD) is a new machine, invented by an Australian wheat farmer, for destroying weed seeds during...
  Harvest Weed Seed Control      Integrated Weed Management Innovations   

In the Fields

What Are Your Problem Weeds?

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