Bondi Junction NSW, Australia
Fact Sheets
Bean (cowpea) fly (291)
Pacific Pests, Pathogens and Weeds
Pacific Pests, Pathogens and Weeds


  • Worldwide. Sub-tropics and tropics. On beans of many kinds - Vigna, Phaseolus, and weeds.
  • Eggs in seedling leaves hatch, and larvae tunnel to the midrib, then to the petiole and lower stem.
  • Plants wilt, are stunted, or may fail to yield.
  • Natural enemies: parasitoid wasps.
  • Cultural control: remove volunteers and weeds; avoid overlapping crops; hill-up 2-3 weeks after germination (damage stimulates roots) ; mulch to encourage root formation; tolerant varieties.
  • Chemical control: commercial growers – treat seed (e.g., imidacloprid); or spray plants (dimethoate).

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