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.