In the year 2008 was conducted field trials in the south-west region of Slovak Republic. Our aim was to detect the efficacy of five herbicides to control common ragweed (Ambrosia artemisiifolia L.) in canopy of maize for grain. In field trial 5 active materials (dimethenamid, mesotrione, rimsulfuron, dicamba, fluorochloridon) were used. Estimation of actual weed infestation and assessment efficiency of applicable herbicides was made according to EWRS score. The most effective preemergence herbicides were fluorochloridon (Racer 25 EC) with efficacy 1-2 and dimethenamid (Spectrum) with efficacy 2-3 after 30 days from application. Less effective were postemergence herbicides with efficacy from 3-4 after 30 days from application according to EWRS score. The recommendation of practical usage of herbicide control of common ragweed for praxis has been elaborated.

Ambrosia artemisiifolia; herbicides efficacy; maize

Presentation: oral