The origins of weeds and invasive plants
P S Bacon, Oxford Forestry Institute, Oxford, UK

Chromolaena oderata in the humid forests of West and Central Africa: management or control?
S F Weise and N Tchamou, Humid Forest Ecoregional Centre, Cameroon

Integrated management of Itchgrass (Rottboellia cochinchinensis) in maize in seasonally-dry Central America: facts and perspectives
B E Valverde and A Merayo, Tropical Agricultural Centre for Research and Higher Education, Turrialba, Costa Rica
R Reeder, CABI Bioscience, Silwood Park, UK
C R Riches, Natural Resources Institute, University of Greenwich, UK

Weed management for sustainable agriculture in the forest margins of lowland Bolivia
M Webb, Consultant, Corwen, Wales B Pound, Natural Resources Institute, University of Greenwich, UK