Kauaʻi record · KCA-IA-00147
Oriental Flower Beetle
Protaetia orientalis
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About Oriental Flower Beetle
Oriental Flower Beetle (Protaetia orientalis) is a member of Scarabaeidae in the order Coleoptera. Its recorded origin status on Kauaʻi is introduced.
Oriental flower beetle (Protaetia orientalis) is a non-native scarab documented from Kauaʻi and now useful to recognize because it can be confused with coconut rhinoceros beetle grubs and adults. Adult oriental flower beetles feed on pollen, nectar, sap, and especially damaged or overripe fruit. Their pale grubs develop in soil, compost, or decaying organic material and characteristically move on their backs.
Kauaʻi occurrence evidence: Matsunaga, Howarth & Kumashiro (2019) Table 1 includes Kauaʻi island code 'Ka'; first-detection year shown as 2002; reported island distribution: Ha, Ka, Ma, Oa.
The cited occurrence evidence does not by itself establish current abundance or population trend on Kauaʻi.
Life cycle
Egg → C-shaped scarab grub in soil/compost/decaying organic matter → pupa → flying adult.
Habitat
Gardens, compost, green-waste areas, fruiting vegetation, and other sites with decaying organic matter.
Food and ecological role
Adults use flower pollen and nectar, sap, and damaged/overripe fruit; larvae feed in decomposing organic material.
Reproduction
Females lay eggs in soil or compost rich in decaying organic matter.
Movement
Adults are strong fliers and the species can also hitchhike with transported organic material.
Ecosystem role
Introduced decomposer and fruit/flower feeder; also a frequent coconut-rhinoceros-beetle look-alike.
Threats and impacts
Usually much less destructive than coconut rhinoceros beetle, but may damage fruit and flowers and complicate CRB identification.
Monitoring
Photograph adults and grubs with scale; note grub movement and breeding substrate; distinguish from CRB before management decisions.
Names and classification
- Scientific name
- Protaetia orientalis
- Common names
- Oriental Flower Beetle
- Family
- Scarabaeidae
- Order
- Coleoptera
- Record type
- species
Kauaʻi occurrence and status
- Kauaʻi occurrence
- Present
- Origin
- Introduced
- Conservation status
- Not assessed
Process and seasonal context
- Seasonal description
- Oriental Flower Beetle (Protaetia orientalis) is a member of Scarabaeidae in the order Coleoptera. Its recorded origin status on Kauaʻi is introduced.