Cover: An experimental field plot at the University of Yucatan, Mexico, which shows velvetbean [Mucuna deeringiana (Bort) Merr.] growing with corn (Zea mays L.). This picture shows how velvetbean is used as a weed controller in southeast Mexico, and other countries. See Caamal-Maldonado et al., "The Use of Allelopathic Legume Cover and Mulch Species for Weed Control in Cropping Systems," p. 27-36. This paper is part of the symposium papers in this issue that start on p. 1. Photo by Ana Luisa Anaya.