Abstract: This paper first reports Theretra oldenlandiae Fabricius is one of the most important pests of Amorphophallus konjac K. Koch. The larvae feed on the tender leaves and cause injury to Amorphophallus konjac.There are two generations each year in the South of Anhui.The larval age has five instars.The duration of prepupal stage is 1─1.5 days.It is very effective in control of small larvae with Dichlorvos or Dipterex.