Whiteflies

Pest & Disease Profile · Insect pest

Whiteflies

Whiteflies are small sap-feeding insects. Adults may fly when leaves are disturbed, while immature stages remain attached to leaf undersides.

What to observe

  • Small pale adults flying from disturbed foliage
  • Flattened immature stages on leaf undersides
  • Honeydew and associated surface growth where populations are high
  • General decline or chlorosis that tracks with infestation intensity

Common look-alikes

  • Small moth-like insects
  • Scale insects or residue on leaf undersides
  • Aphid-related honeydew
  • Non-pest chlorosis

Evidence that improves confirmation

  • Inspect adults and immature stages
  • Use sticky cards for trend data, not as the sole identification tool
  • Check whether symptoms spatially correspond with actual colonies

Risk context

  • Protected environments can allow continuous reproduction
  • New plants can introduce hidden immature stages
  • Honeydew can create secondary cleanliness and microbial concerns

Management principles

  • Strengthen incoming-plant inspection
  • Remove heavily infested material where site policy allows
  • Monitor adult and immature stages separately
  • Use lawful, crop-appropriate controls and verify population trends