Have you seen citrus fruit borer symptoms?
Be on the lookout for symptoms and report them to Biosecurity Queensland.
Early detection and reporting are the key elements in controlling the pest.
Call us 13 25 23
The caterpillar of the citrus fruit moth (Citripestis sagittiferella) is known as the citrus fruit borer. The borer is a serious threat to our citrus industry because it burrows into the fruit rind, and eventually the fruit flesh, causing internal rot and fruit drop. Besides decreasing productivity and market value due to scarring of fruit and fruit becoming inedible, market access could also be affected.
Citrus fruit borer (Citripestis sagittiferella) is not known to occur in Australia. It is prohibited matter in Queensland under the Biosecurity Act 2014.
The borers leave minute holes in the fruit rind, and cavities under the fruit surface. These holes might be associated with caterpillar frass or gumming.
Internal fruit rots introduced by borers can lead to fruit drop.
Adult moths are about 10 mm long, grey-brown with yellow to grey-brown forewings and transparent hind wings. They are strong nocturnal flyers.
After the eggs hatch, the caterpillars bore into citrus peel, then tunnel into the pith and citrus flesh. Initially, the caterpillars are orange to dark reddish-brown with a dark brown head, and can grow up to 20 mm long.
When mature, the caterpillars fall to the ground on silken threads and pupate in the soil. Pupation takes about 10 days.
The eggs are laid in clusters on the underside of citrus fruit.
Citrus fruit borers feed on plants in the family Rutaceae, particularly citrus.
Citrus fruit borer is known to occur in Thailand, Malaysia, Singapore and western Indonesia. It is not currently known to occur in Australia.
|Spread of pest|
Long-distance spread occurs by movement of infested citrus fruit or soil containing pupae. Long-distance dispersal by strong winds may also be possible.
Citrus fruit borer could be introduced into Australia through illegal importation of fruit or soil. The Australian Quarantine and Inspection Service closely regulates approved plant imports and monitors for illegal plant movement.
|Management and quarantine|
Inspect fallen fruit from citrus trees for minute holes and cavities under the fruit surface, with caterpillar frass or gumming.
Cut open fruit to look for citrus fruit borer caterpillars and damage caused by caterpillars.
If detected, report immediately to Biosecurity Queensland.
There are simple steps you can take to protect your farm:
|Reference and acknowledgement|
Andrew Beattie (University of Western Sydney), David Astridge (Department of Agriculture, Fisheries and Forestry, Queensland) and Ceri Pearce (Biosecurity Queensland, Department of Agriculture and Fisheries).