Genetically modified plants have now been produced in many species. An examination of pollination in these plant will be necessary before commercial cultivars are produced. In addition, this technology provides a new tool for the study of cross-pollination. An initial field trial, using tobacco, was carried out in 1989. Results demonstrated that pollen transfer from genetically modified plants can be readily followed. Particular species of bumble bees were potential pollen vectors. A second field experiment is being carried out in 1990, to examine cross-pollination in more detail.