Field Identification
A serious sweet potato pest whose larvae tunnel storage roots and vines, leaving frass, rot, and bitter flavor; adults are ant-like snout beetles. Infested roots fail market and home-kitchen tests alike.
Reddish-brown adults about 6 mm long with a narrow snout; legless grubs curve inside roots. Breeds year-round in frost-free zones on roots and vines.
How to Deal With It
Organic Control Methods
Entomopathogenic nematodes (Steinernema carpocapsae) to soil targeting pupae near harvest where permitted; neem soil drenches show partial suppression in research—combine with sanitation.
Ant predation on larvae/pupae at soil line; fungal pathogens in moist soils—avoid waterlogging that favors rot instead.
Use certified slips; deep bury culls; rotate fields; hill soil to cover exposed cracks; harvest on time and cure quickly.
Pheromone trapping reduces males in small plots when combined with removal of wild Ipomoea hosts.
Eliminate wild morning glories near beds; inspect slips; do not compost infested roots in warm climates.
Let Nature Handle It
Natural Enemies
- Predatory ants
- Entomopathogenic nematodes
- Entomopathogenic fungi
Threat Map