2CADENA HINOJOSA M A,CAMPBELL R N.Characterization of isolates of four aphid-transmitted sweetpotato viruses[ J] . Phytopathology,1981,71:1086-1089
3JEEVA M L,BALAKRISHNAN S.Characterization purification and serology of sweet potato feathery mottle virus in India[J].Journal of Root Crops,2004,30(1):24 -30.
4CALI B B,MOYER J W.Differential properties of three sweetpotato virus strains[J] .Phytosthology,1979,69:1023.
5NOME S F,SHALLA T A,PETERACENT J.Comparison of virus particles and intracellular in clusions associated with vein mosaic ,feathery mottle and russet crack diseases of sweetpotato[J] .Phytopathology Zeitschrift, 1974, 79:169-178.
6TSAY H S,TSENG MT.Embryoid formnation and plantlet regeneration froman thercallus of sweetpotato[J].Bot Bull Acad Since,1979(20):117 -122.
7CARWELL GK,LOCKRD.Root and shoot initiation by leaf ,stem and storage root explants of sweet potato[J].Plant Cell Tissue Organ Culture,1984(3):229-236.
8JOHN K S,PILLAI P S,NAIR G M,et al.Phosphorus and potassium deficiency symptoms insweet potato under sand culture[J] .Journal of Root Crops,2004,
30(1) :5 -9.
9SHARMA R P,DAYAL T R.Harvest higher yield of sweet potatoin Northwester region of India[J] .Indian Farming,1997,47(6) :23 -30.