slide1 n.
Skip this Video
Loading SlideShow in 5 Seconds..
Grass weed management with IPM Denmark PowerPoint Presentation
Download Presentation
Grass weed management with IPM Denmark

Loading in 2 Seconds...

play fullscreen
1 / 14

Grass weed management with IPM Denmark - PowerPoint PPT Presentation

  • Uploaded on

Grass weed management with IPM Denmark. MODULE C17. Know your weeds – grass weeds. IPM measures for controlling winter annual grass weeds:. A healthy crop rotation Delayed sowing Optimal plant density Focused soil cultivation, including Stale seedbed Stubble cultivation Ploughing

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
Download Presentation

PowerPoint Slideshow about 'Grass weed management with IPM Denmark' - chynna

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
know your weeds grass weeds
Know your weeds – grass weeds

IPM measures for controlling winter annual grass weeds:

  • A healthy crop rotation
  • Delayed sowing
  • Optimal plant density
  • Focused soil cultivation, including
    • Stale seedbed
    • Stubble cultivation
    • Ploughing
  • Glyphosate before sowing the main crop
  • Optimized use of herbicides

IPM means that all plant protection measures have to be used wisely, otherwise problems like resistance may develop rapidly

importance of the crop rotation
Importance of the crop rotation

A varied crop rotation will be able prevent grass weeds

- But remember economic sustainability!

Example of crop rotation suggested by the ENDURE RA2.6 participants for use under northern European conditions on a pig producing farm

Apera spica-venti (Loose Silky-bent)

Alopecurus myosuroides (Black grass)

Examples of grass weeds sensitive to a varied crop rotation

importance of the crop rotation1
Importance of the crop rotation

The effect of a varied crop rotation:

Crop rotation with 50 % cereals

Crop rotation with 75 % cereals

Broadleaved weeds


Apera spica-venti

With weed control

With weed control

No weed control

No weed control

German experiments

sowing date
Sowing date

Early sowing promotes grass weed infestation

Amount of Alopecurus myosuroides in winter wheat at harvest as a function of the sowing time


Normal sowing

Early sowing

soil management and grass weed seeds
Soil management and grass weed seeds

Combining soil cultivation and herbicides provides effective control of grass weeds:

Amount of Apera spica-venti in a crop rotation with 80 % winter cereals



Reduced cultivation

No weed control

25 % normal doze

50 % normal doze

100 % normal doze

know your weeds important differences
Know your weeds – important differences

Effective control is achieved through knowledge of the weed.

(1): For climatic conditions similar to the Danish

special case bromus sterilis
Special case– Bromussterilis

Major reduction of seed bank without using herbicides

traits of the varieties
Traits of the varieties

Prioritized list for choice of winter cereal variety:

Competition against weeds is not of highest importance when choosing variety!

  • Winter hardiness
  • Yield
  • Quality (fodder, grain etc.)
  • Risk of lodging
  • Tolerance towards diseases (varies among species)
  • Competition against weeds

Use available information about the yield potential, disease resistance etc.

chemical weed control
Chemical weed control

Yield increase from chemical weed control



Poa annua &

Dicot weeds

Lolium sp.

Dicot weeds

Source: The Danish National Field Trials®2008

chemical weed control1
Chemical weed control
  • Choose the right product for the right job!
  • Use as little as possible but as much as needed
  • Use Decision Support Systems where available, e.g. Crop Protection online:
  • It is a challenge to treat fields individually – where large – scale farming is an important parameter, it may e.g. be relevant to think about a basic- and advanced treatment
    • Divide e.g. the fields in groups according to problem
  • Consider margin and patch spraying in larger scale
prevention of resistance
Prevention of resistance
  • Change between products with different modes of action
  • Avoid using Sulfunylurea-products more than once every growing season
  • Change between modes of action

This wheat field was in the spring treated with 2 ALS-inhibiting herbicides: 110 g Broadway (florasulam+pyroxulam) and app. 0.1 l Iodosulfuron.

Loliumperenne is still growing almost unaffected

dispersal of grass weed seeds
Dispersal of grass weed seeds
  • Through machinery
    • As the farms grow bigger, the machinery has to cover larger areas, and seeds are very likely to be spread
  • Therefore: remember proper hygiene
    • This means:
      • Harvest the infested fields last, whenever possible
      • Clean machinery when leaving an infested field
      • Keep a stable field margin with perennial herbs, to avoid weed infestations to spread from here
evaluation of the effort
Evaluation of the effort
  • Before harvest, make a field walk to:
    • Follow up on the crop protection performed through the season
    • Plan the strategy for the next season
    • Make/update the weed map
  • A good result starts with proper planning!
  • Weed map: