Survey of weeds in maize crops in Europe

Per Kudsk & P.K. JensenAarhus University

Denmark

Background

Study commissioned by MonsantoMain purpose was to develop a complete list of weeds rather than an exact classification of their frequencyData collected by contacting national expertsContributions in the form of

Questionnaire (very common, common or less common/rare)

Questionnaire

Background

Study commissioned by MonsantoMain purpose was to develop a complete list of weeds rather than an exact classification of their frequencyData collected by contacting national expertsContributions in the form of

A questionnaire (very common, common or less common/rare) Recent weed surveysWeed occurrence in herbicide efficacy trials

Contributors

V. Bibard & J.-B. Thibord, FranceE. Czembor, PolandS. Dumitru, Romania G. Foucart, BelgiumR.J. Froud-Williams, UKP.K. Jensen & J.E. Jensen, DenmarkM. Saavedra & A.Taberner, Spain M. Sattin, ItalyJ. Soukup, Czech RepublicW. Voegler, Germany

Maize area in surveyed countries

Overall results

203 weed species belonging to 42 families were reported61 weed species were assessed as being ”very common” in at least one countryChenopodium album was the only weed species classified as ”very common” in all countries

Chenopodium album

Very common

Common

Less common/rare

Very rare/absent

Amaranthus spp.

Very common

Common

Less common/rare

Very rare/absent

Ambrosia artemisifolia

Very common

Common

Less common/rare

Very rare/absent

Datura stramonium & Stellaria media

Very common

Common

Less common/rare

Very rare/absent

Echinochloa crus-galli & Setaria spp.

Very common

Common

Less common/rare

Very rare/absent

Poa anua & Elymus repens

Very common

Common

Less common/rare

Very rare/absent

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