Bondi Junction NSW, Australia
Fact Sheets
2021-09-08T03:12:19.8757890Z
   2
Coffee green scale (272)
Pacific Pests, Pathogens and Weeds
Pacific Pests, Pathogens and Weeds

Summary

  • Widespread distribution. Southeast Asia, Africa, South America, Oceania. On coffee, mainly. A major pest.
  • Eggs laid under the scale; nymphs ('crawlers') disperse, moult and adults feed on shoots, expelling excess sap as honeydew. Feeding weakens trees as do sooty moulds growing on the honeydew excreta. Ants prevent control by wasps and ladybird beetles.
  • Natural enemies: parasitoid wasps exist, but are only effective in the absence of ants.
  • Cultural control: scale-free nurseries; maintain shade; use 'Tanglefoot' to control ants; grow pumpkins in coffee to attract ladybird beetles.
  • Chemical control: soap, white or horticultural oils; or synthetic pyrethroids for ant control.

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