- Adult wingless cockroaches are 25 mm long and the males may be winged. Photo: D. Ironside.
Above ground parts of seedlings are chewed and sometimes cut off. Photo: State of Queensland
Wingless cockroach adults are large, shiny brown with yellow stripes and margins. They are nocturnal, feeding at night and sheltering by day under trash.
|Scientific name||Calolampra elegans and C. solida|
|Description||Adult males and females of C. elegans are large (25-35 mm long) and shiny brown with yellow stripes and margins. The male of C. solida is fully winged, whereas the females are wingless. Nymphs are initially greyish-brown or tan, developing yellow markings when about half adult size. Both species are Australian natives.|
|Pest status||Major, recorded as pests in Queensland's Central Highlands, irregular. Other native cockroaches, recorded as minor pests, are Cosmozosteria sp. and Platyzosteria sp.|
|Crops attacked||Omnivorous; food includes seedlings of all field crops.|
When seedlings are present.
|Damage||On small seedlings, they feed on cotyledons and stems, often severing the stem. On larger seedlings, they feed on the leaves and growing points.|
|Monitoring and action level||
Use germinating seed baits.
Take action when there are one or more cockroaches per two germinating seed baits.
Cultural control: Wingless cockroach populations reach highest densities under no tillage with stubble retained.
Conservation of natural enemies: No effective natural enemies have been identified.
- Crop Insects: The Ute Guide Northern Grain Belt
- Pests of Field Crops and Pastures: Identification and Control. Editor: P.T. Bailey