Members of the family Geminiviridae characteristically have circular single-stranded DNAgenomes packaged within twinned (so-called geminate) particles. Geminiviruses are currentlydivided into four genera on the basis of their genome organizations and biological properties[2,20].Thosethathaveamonopartitegenomeandaretransmittedbyleafhoppervectors,primarilyto monocotyledonous plants, are included in the genus Mastrevirus, of which Maize streak virus isthe type species. Viruses that have monopartite genomes distinct from those of the mastrevirusesand that are transmitted by leafhopper vectors to dicotyledonous plants are included in thegenus Curtovirus, with Beet curly top virus as the type species. The genus Topocuvirus, recentlyrecognized by the International Committee on Taxonomy of Viruses (ICTV) [18], has only onemember (also the type species), Tomato pseudo-curly top virus, which has a monopartite genomeandistransmittedbyatreehoppervectortodicotyledonousplants.ThegenusBegomoviruscontainsviruses that are transmitted by the whitefly Bemisia tabaci (Gennadius) to dicotyledonous plants,with Bean golden yellow mosaic virus (originally Bean golden mosaic virus – Puerto Rico)asthetype species. Many begomoviruses have bipartite genomes (DNA A and DNA B components),although numerous begomoviruses with a monopartite genome occur in the Old World, and thereare some for which a single component is not infectious yet no DNA B component has been found.Geminiviruses cause significant yield losses to many crop plants throughout the world [5, 7].Because of their economic importance and the relative ease with which their DNA genomescan be cloned, many geminiviruses have been isolated and characterized. Guidelines for naming