Crusader bug

Date: 22 Aug 2002   Author: Jianhua Mo

Crusader bug


  • The adults are brown and have a distinguishing yellow X-shaped cross. Juveniles do not have a cross — they have two small spots on their back.
  • Approximately 2.5 cm long.
  • Three to four generations per year.
  • Five nymphal stages.
  • Eggs are large, elongated and brown, with a rounded lid.


  • Crusader bugs feed on young plant growth, resulting in the wilting of shoots. The shoots go brown and often die back to the old wood.
  • All citrus varieties can be attacked.


  • Monitor once or twice during October–April by checking five randomly selected shoots on each tree.

Natural enemies

  • Assassin bugs
  • Praying mantises
  • Birds
  • Parasitic wasps

Control measures

  • If 25 or more of the shoots are infested, spot spray with a selective insecticide.

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