SWEETPOTATO WEEVIL, Cylas formicarius elegantulus (Summers)
Description Picture Damage
  • adults are about 1/4 inch long and ant-like in appearance
  • head, snout and wings are a dark metallic blue and thorax and legs are bright red-orange
  • larvae are legless grubs almost 1/2 inch long when full grown
  • white with brown heads
  • Photo credit: Extension Entomology, Department of Entomology, Texas A&M University

  • larvae tunnel through tubers, causing discoloration
  • impart a bitter taste to the tuber
  • infested sweet potatoes are unfit for human consumption