Pablo Castillo, Ph.D. (1988) in Nematology, University of Granada (Spain), is Research Scientist in the Institute of Sustainable Agriculture belonging to the Spanish Council for Scientific Research. He has published extensively on Nematology.Nicola Vovlas, BSc in Agronomy, University of Bari (Italy), is Research Leader in Nematology in Institute for Plant Protection, Consiglio Nazionale delle Ricerche. He has published extensively on Nematology.Available from the same authors: Bionomics and Identification of the Genus Rotylenchus (Nematoda: Hoplolaimidae) (Brill, 2005).