Bondi Junction NSW, Australia
Fact Sheets
2021-09-08T03:11:36.6671421Z
   2
Citrus scab (048)
Pacific Pests, Pathogens and Weeds
Pacific Pests, Pathogens and Weeds

Summary

  • Worldwide distribution. On lemon, rough lemon and mandarin. Other species of citrus - grapefruit, orange and pomelo - are also susceptible, but less so. An important disease.
  • The fungus distorts the leaves and makes the fruit unsightly. It stunts common rootstocks in the nursery, so they are difficult to bud.
  • Similar to citrus canker (see Fact Sheet no. 091), except leaves are stunted, wrinkled with torn margins.
  • Spread is by wind and rain, by insects, on nursery plants, and fruits.
  • Cultural control: make nurseries at distance from production areas; prune to keep open canopy, and improve air circulation.
  • Chemical: in the nursery, use copper or chlorothalonil at the beginning of leaf flushes.

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