Using an integrated approach to weed management

Key learning outcomes

  • Demonstrate an understanding of the core principles of IWM
  • Understand the context in which each component can be effectively delivered

Introduction to the course

Integrated Weed Management (IWM) is an approach to managing weeds that integrates multiple control tactics. By including a diverse range of control methods in the design of a management system, it allows growers to control the most troublesome weeds. This is a presentation developed by Philippe Delval, ACTA, France. The video is about seven minutes 45 seconds long. Additional notes, comments and links to additional content are given below the presentation.

Music by

Comments, notes and resources referenced in the video

  • Quantity = Necessary for the internal market (consumption, independence) and external (export, trade balance).
  • Quality = Sanitary, organo-leptic, ...
  • Plant protection products = One of the components of intensification just like mechanization and varietal evolution
  • Pollution = Water, soil, air
  • Resistances = of pests to products; which causes inefficiencies or partial efficiencies
  • Society = Pesticides are in the public landscape because information on their impacts (not always scientifically based) is widely relayed on media
  • Consumers = The issue of residues is still present
  • Environment = This includes pollution problem but also impacts on biodiversity
  • EOS = Who cannot fully meet the expectations of price and quantity produced for both internal consumption and export
  • ICS = Challenged by mainly environmental and health issues
  • Sustainable = Which takes into account the 3 pillars: economic, social, environmental
  • All = So this includes chemical control. This must be reasoned and not privileged
  • Measures = These measures will be developed in the modules: Prevention and Alternative control methods
  • Harmful organisms = The training does not develop the part "recognition of pests and diseases". However, this subject is discussed in the "Monitoring" module.
  • Justifiable levels = Concept of thresholds developed in principle 3
  • Careful consideration = All methods have their place. But the choice must take into account the reduction of the use of pesticides and the limitation of the impacts
  • Discourage = The objective is more to limit the pressure of bio-aggressors than to eradicate them
  • Justified levels = The notion of intervention threshold is essential
  • Risks = Reduce exposure and impact of practices
  • Healthy = Create the most favorable conditions for crops and the most unfavorable to pests and diseases
  • little disturbance as possible = Practices with the least possible impact
  • Natural mechanisms = By promoting the effects of functional biodiversity
Promote and make accessible = This results in the development of accessible sites, guides or guidelines.
Annex 3 pdf
Subject to regulation
  • Alternative control = approval of biocontrol substances
  • Supervision of chemical control = approval of chemical substances
This diagram is taken from a document produced in 2008 by BiPro available on the Endure website “Draft Guidance Document for establishing IPM principles”
How are the 8 principles positioned?
  • The base = principle 1
  • The consolidation = principle 2 & 3
  • Non-chemical solutions = principle 4

Around - resistance [principle 7] concerns chemical [principles 4 & 5] but also biological methods

At the top- systems analysis [principle 8]

E = efficiency; S = substitution; R = redesign

Integrated Weed Management (IWM) is a complex system approach in which many tools and tactics are combined to manage weeds. In order to support farmers in defining integrated weed management strategies we propose a framework consisting of five different pillars for integrated weed management. Each pillar contains a list of tactics. The tactics affect one or more parts of the weed life cycle or affect the weed-crop interaction. An Inspiration sheet has been developed by IWMPraise researchers. It describes what is IWM and its different measures. This training will more clearly define these practices and give links to IWMpraise documents produced during the project (inspiration sheets, brochures…)
An inspiration sheet has been produced to introduce this game. You have access to the rules and all the cards required to play. Please, carefully read the rules to understand the meaning of the measure cards that we will present during this training, accompanying the presentation of the alternative or chemical methods.

IWMGAME : One special card allow you to increase your time units during one period. But it costs two money units!

Additional resources and signposting

Below are a number of additional resources related to the session and signposting for further information

The group at Wageningen University and Research have developed the excellent tool below. You can access the tool by clicking on the picture, or the link underneath the picture. The tool will open in a new tab on your browser.

Wageningen University and Research IWM Tool (

The IWMPRAISE website has many useful reports, booklets and inspiration sheets across the website. Throughout the rest of the course any resources of specific relevance will be highlighted and acessible from the links on those pages.