Bondi Junction NSW, Australia
Fact Sheets
Sweetpotato virus G (374)
Pacific Pests, Pathogens and Weeds
Pacific Pests, Pathogens and Weeds


  • Worldwide distribution. Present in several Pacific island countries. Only found in sweet potato. The abbreviation is SPVG. It is a potyvirus.
  • Damage: on its own no symptoms and probably little impact on yield; with other viruses, e.g., Sweetpotato feathery mottle (and perhaps Sweetpotato chlorotic stunt virus), SPVG multiplies many times normal resulting in lower yields.
  • Detection: grafting to Ipomoea setosa, or using ELISA and/or PCR.
  • Natural enemies: there are many parasitoids and predators of aphids, but aphids are not commonly seen on sweet potato in Pacific island countries, so their effect is probably small.
  • Spread by aphids, infected cuttings and storage roots.
  • Cultural control: use planting material from healthy 'seed' scheme (i.e., mother plants regrown from meristems after heat treatments and tested negatively for SPVG.
  • Chemical control: Not a method to use as insecticides cannot kill the aphids before they have transferred the virus.

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