© D. Ironside Queensland Government
© Queensland Government
Most Australian cockroaches are found in native habitats and are not pests of crops. Calolampra spp. has been reported as a pest of seedlings in Central Queensland.
- Native Australian black cockroach
- Adults of C. elegans are 25-35mm long and shiny brown with yellow stripes and margins.
- C. solida males are fully winged, females are wingless.
- Nymphs are initially greyish-brown or tan, developing yellow markings when about half adult size.
May be confused with
- House or American cockroach (Periplaneta americana).
- Other native woodland cockroaches.
Distribution and habitat
- Native to Australia. Recorded as irregular pests in Queensland's Central Highlands.
- Wingless cockroach populations reach highest densities under no tillage with stubble retained.
- Other native cockroaches that have been recorded as minor pests include Cosmozosteria sp. and Platyzosteria sp.
Seedlings of all field crops.
- Small seedlings: feeds on cotyledons and stems, often severing the stem.
- Larger seedlings: feeds on the leaves and growing points.
Wingless cockroaches are nocturnal, feeding at night and sheltering by day under trash.
Monitoring and thresholds
Use germinating seed baits pre-plant to assess soil pest presence. Take action if 1 or more cockroaches are found per 2 baits.
No effective natural enemies have been identified.
- Baiting with insecticide-treated cracked grain baits.
- If the field has a history of cockroach damage, cultivation and/or destruction of stubble may help reduce populations.
- Using germinating grain baits (video)—The Beatsheet
- Images of many Australian cockroach species—Brisbane Insects and Spiders
- Registered chemicals database—Australian Pesticides and Veterinary Medicines Authority (APVMA)
- Last reviewed: 14 Jan 2020
- Last updated: 14 Mar 2019