Plutella xylostella (DBM) is a key pest of crucifers resistant to many insecticides and some crystalendotoxins. Biological control based IPM and classical biocontrol have had varied success. How can it be improved? This book presents key papers and the proceedings of an international symposium held in Montpellier (France) in October 2002. The status of Plutella and control measures used in different areas of the world are discussed, and recommendations for improving biocontrol are made.