Three selected isolates of SCMV comprised of two sugarcane-SCMV from SupanBuri and UdonThani provinces, and one isolate of maize-SCMV from SaraBuri province were collected in 2003–2004. They were identified as SCMV by DAS-ELISA. The infected leaves were manually inoculated to leaves of U-Thong-1 sorghum seedlings for using as viral source. These three selected isolatesshowed different obvious mosaic symptoms on sugarcane, and were named UT6(from U-Thong district, Supan Buri province), UD7 (from Udon Thani province),and SBC2 (from Sara Buri province), and processed for gene cloning by immuno-capture reverse transcription polymerase chain reaction (IC-RT-PCR) (modifiedfrom [4]). Primers for CP gene amplification were designed from SCMV genomicsequences retrieved from Genbank; one was complementary to the 3region ofNIb polymerase gene and the other to 3terminal sequence of CP gene, therebyencompassing about 1200 bp fragment of SCMV 3genome. RT-PCR reaction wasdone using SuperScriptTMIII One-step RT-PCR mix (Invitrogen) containing 25 µl2× reaction mix.An oligo (dT22) or reverse primer SCP2 (5CTAGTGGTGCTGCTGCACTC3) corresponding to C-terminal of SCMV CP was used for first-strand cDNA synthesis. Primer SCP1 (5CGGAAATTTTATGCGTGGCTTC3)was also added for ds cDNA amplification. The ds DNA fragments obtainedwere fractionated by electrophoresis. IC-RT-PCR products from the three isolatesof SCMV were eluted from agarose gel and cloned into the pGEM-T Easyvector (Promega). Nucleotide sequences obtained in both sequencing directionswere used to create the complete sequence of SCMV-CP gene in the DNASTARprogram. The encoded CP amino acid sequences were aligned using ClustalW andtheir phylogeny determined using its neighbor-joining option and bootstrappingconducted by MEGAversion 2.1