Biological and molecular characterization of plant viruses and development of diagnostic tools. Molecular biology of Cucumber mosaic cucumovirus (CMV) and study of virus-satellite relationship. Development and evaluation of RT-PCR methods and non-radioctive dot-blot hybridization assays for detection of plant viruses. Virus and virus-like diseases of Citrus. Molecular characterization and genetic variability analysis of Mediterranean Citrus Tristeza Virus isolates.