1. Survey of weeds in
maize crops in Europe
Per Kudsk & P.K. Jensen
Aarhus University
Denmark

2. Background
Study commissioned by Monsanto
Main purpose was to develop a complete list of
weeds rather than an exact classification of their
frequency
Data collected by contacting national experts
Contributions in the form of
Questionnaire (very common, common or less common/rare)

3. Questionnaire

4. Background
Study commissioned by Monsanto
Main purpose was to develop a complete list of
weeds rather than an exact classification of their
frequency
Data collected by contacting national experts
Contributions in the form of
A questionnaire (very common, common or less common/rare)
Recent weed surveys
Weed occurrence in herbicide efficacy trials

5. Contributors
V. Bibard & J.-B. Thibord, France
E. Czembor, Poland
S. Dumitru, Romania
G. Foucart, Belgium
R.J. Froud-Williams, UK
P.K. Jensen & J.E. Jensen, Denmark
M. Saavedra & A.Taberner, Spain
M. Sattin, Italy
J. Soukup, Czech Republic
W. Voegler, Germany

6. Maize area in surveyed countries

7. Overall results
203 weed species belonging to 42 families were
reported
61 weed species were assessed as being ”very
common” in at least one country
Chenopodium album was the only weed species
classified as ”very common” in all countries

8. Chenopodium album
Very common
Common
Less common/rare
Very rare/absent

9. Amaranthus spp.
Very common
Common
Less common/rare
Very rare/absent

10. Ambrosia artemisifolia
Very common
Common
Less common/rare
Very rare/absent

11. Datura stramonium & Stellaria media
Very common
Common
Less common/rare
Very rare/absent

12. Echinochloa crus-galli & Setaria spp.
Very common
Common
Less common/rare
Very rare/absent

13. Poa anua & Elymus repens
Very common
Common
Less common/rare
Very rare/absent

14. http://web.agrsci.dk/djfpublikation/index.asp?action=show&id=1113