LAUSR

Extensive herbicide use is one reason for the declining biodiversity of arable weeds. This study aimed to investigate (i) whether herbicide decisions recommended by a decision support system increase the weed species diversity compared to standard recommendations, and (ii) whether high weed species diversity reduces herbicide intensity, which in turn contributes to higher diversity. Data on weeds and herbicide applications in winter wheat fields in north‐eastern Germany were collected in 15 field trials over 2 years. Five treatments differed in the way of decision‐making for herbicide application, including two treatments according to recommendations of decision support systems.