Optimising herbicide use – the driving force behind the development of the Danish decision support system
P Kudsk, Danish Institute of Agricultural Sciences, Flakkebjerg, Denmark

A biological framework for developing a weed management support system for weed control in winter wheat: weed seed biology
R J Froud-Williams, University of Reading, UK

A biological framework for developing a weed management support system for weed control in winter wheat: weed competition and time of weed control
A M Blair, ADAS Boxworth, Cambridge, UK
J W Cussans and P J W Lutman, IACR-Rothamsted, Harpenden, UK

Optimising mixtures of herbicides within a decision support system
P Rydahl, Danish Institute of Agricultural Sciences, Flakkebjerg, Denmark