AN INQUIRY INTO the root and bulb diseases of Easter lilies, begun in the 1950's, has involved the whole lily-bulb industry in radical changes. Growers co-operating with University Extension and Experiment Station research workers field-tested methods developed in the laboratory and useful changes were quickly accepted by growers. Improved planting stocks were introduced, methods of propagation have been radically altered, and cultural practices have been changed. Improved methods of disease control have made many of these advances possible.