- Widespread distribution. Especially woody plants. Common on avocado, breadfruit, Casuarina, citrus, Ficus, guava. Hosts occur in more than 60 plant families. Many hosts. An important pest.
- Females produce living young. Males rare.
- Outbreaks cause leaves to yellow and shoots to die.
- Honeydew from these sap-sucking scales falls onto leaves and fruits, to be turned black by fungal moulds.
- Natural enemies: ladybird beetles (Rodolia) important.
- Cultural control: prune infested stems, branches and fruits, and burn; add fertilizer, manure or compost to improve tree health; assist natural enemies: destroy ants' nests (hot water), prune low branches, and weed.
- Chemical control: soap, white or horticultural oils; priority is to remove ants to let natural enemies work: use synthetic pyrethroids.
Pacific Pests, Pathogens, Weeds & Pesticides
Breadfruit (Seychelles) scale (242)
Photo 1. Colony of Icerya seychellarum on Macaranga species Papua New Guinea attended by Oecophylla ants. Immatures are yellow.
Photo 2. Icerya seychellarum on unidentified host. Note the red colour of the mealybugs under the white powdery wax.
Seychelles scale, silvery cushion scale, breadfruit mealybug
AUTHOR Grahame Jackson
Information from CABI (2020) Icerya seychellarum (Seychelles scale). Crop Protection Compendium. (https://www.cabi.org/cpc/datasheet/28434); MAF Plant Health & Environment Laboratory (2011) Seychelles Fluted Scale (Icerya seychellarum): PaDIL - http://www.padil.gov.au.
Produced with support from the Australian Centre for International Agricultural Research under project PC/2010/090: Strengthening integrated crop management research in the Pacific Islands in support of sustainable intensification of high-value crop production, implemented by the University of Queensland and the Secretariat of the Pacific Community.