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Per_Kudsk_Prague11

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  • 1. Survey of weeds inmaize 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

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