Influence of weeds on United States food quality and supply
L R Oliver, University of Arkansas, Fayetteville, USA

Herbicides and food quality - a misfit?
B G Johnen, Zeneca Agrochemicals, Haslemere, UK

The impact of consumer demands on international vegetable crop production
G K Bradbury, Fisher Fresh Vegetables Ltd, Faversham, UK

Weed control and crop quality: the conflicting demands in organic and conventional farming systems
A R Leake, CWS Farms Group, Leicester, UK