Mango pulp weevil

Have you seen mango weevil symptoms?

If you see mango pulp weevil symptoms, report them to Biosecurity Queensland straight away.

Early detection is vital.

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  • Photo of two mango cheek slices showing the larval tunnels of mango pulp weevil
    Photo of two mango cheek slices showing the larval tunnels of mango pulp weevil
  • Photo of whole mango showing the exit hole of adult mango pulp weevil, mango slice showing pupa in chamber with two adults and a mango slice showing pupal chambers
    Photo of whole mango showing the exit hole of adult mango pulp weevil, mango slice showing pupa in chamber with two adults and a mango slice showing pupal chambers

General information

Mango pulp weevil (Sternochaetus frigidus) is a serious exotic pest that tunnels into the flesh of mangoes making them unfit to eat. Mango pulp weevil looks similar to mango seed weevil, but eats the flesh rather than the seed.

Mango pulp weevil is currently present in South-East Asia, Bangladesh, Burma, Thailand, Malaysia, north-east India, Singapore, the Philippines and Indonesia (including Irian Jaya), but has not been found in Queensland.

Overview

Scientific name

Sternochaetus frigidus

Where does it occur?

The pest is known to exist in north-east India, Bangladesh, Burma, Thailand, Malaysia, Singapore, the Philippines and Indonesia (including Irian Jaya).

Symptoms and damage

No outward signs of attack are evident until the adult weevil bores out of the fruit. To check for infestation, the fruit must be sliced open. Internal signs of infestation include brown tunnels in the flesh and the presence of larvae, pupae or adults.

Life cycle

Eggs are laid on fruit from which larvae develop and tunnel through the flesh forming a chamber adjacent to the seed. From there each larva continues to tunnel through the flesh leaving brown granular faeces behind. The larva is plump, pale coloured and legless, with a well defined head. It eventually develops into a pupa which stays in a chamber hollowed out of the flesh and develops into an adult. The adult weevil stays in the chamber until mature and emerges from the fruit by boring a hole through the skin. The adult is mottled brown and is difficult to distinguish from the mango seed weevil (S.mangiferae) which occurs in Queensland. The mango seed weevil can be differentiated by its habit of feeding within the seed of the mango rather than the flesh.

Quarantine

The Australian Quarantine and Inspection Service prohibits the importation of mangoes into Australia from areas where mango weevil is known to exist. It is possible that the pest could enter Queensland in illegally imported mango fruit, particularly as there is often no external sign of infestation.

Management

No effective control measures are known for this pest.

Last updated 03 September 2012