Tropical soda apple

Alert

Be on the lookout for tropical soda apple and report any sightings within 24 hours.

Reporting options

Native to South America, tropical soda apple is a prickly perennial shrub with yellow fruit. It can be invasive and host various plant viruses.

Tropical soda apple is a major problem in Florida, where it has invaded at least 500,000ha of land and costs landholders millions of dollars each year in control costs and lost production. Queensland has only a small number of isolated infestations, but the species could become a problem in coastal and subcoastal Queensland.

Scientific name

Solanum viarum

Similar species

  • Devil's apple (Solanum capsicoides)
  • Devil's fig (S. torvum)
  • Giant devil's fig (S. chrysotrichum)
  • Apple of Soddom (S. linnaeanum)

Description

  • It is an upright, multi-branched perennial shrub and is 0.5–2m tall.
  • Stems have thorn-like prickles up to 12mm long.
  • Leaves are 10–20cm long and 6–15cm wide. They are covered with short hairs and white prickles.
  • Flowers are white with 5 recurved petals and white to cream-coloured stamens.
  • Immature fruits are smooth and round. They are mottled light and dark green like a watermelon.
  • Mature fruits are yellow and 1–3cm in diameter. The leathery skin surrounds a pale-green, scented pulp, each containing 180–240 seeds.
  • Seeds are pale brown, tear-shaped and 3mm across.

3D model

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Habitat

  • Prefers open, disturbed sites, especially pastures and areas around cattle yards.
  • Prefers coastal, high-rainfall habitats in tropical and subtropical areas.

Distribution

  • First detected in Queensland in November 2010 near Coominya in South East Queensland.
  • Currently a small number of isolated infestations in Queensland.

Life cycle

  • Reproduces from seeds.
  • Flowers in autumn–winter.
  • Fruit sets in winter.

Affected animals

  • Livestock

Impacts

Economic

  • Invades and replaces pasture, including improved pasture.
  • Leaves are unpalatable to livestock (although fruit are readily eaten).
  • Provides an alternative host for at least 6 viruses that affect various vegetables.

How it is spread

  • Seeds are spread primarily by cattle but also by birds, feral pigs, deer, contaminated hay, and water.

Control

Legal requirements

  • Tropical soda apple is a category 2, 3, 4 and 5 restricted invasive plant under the Biosecurity Act 2014. You must not:
    • move it
    • keep it
    • give it away
    • sell it
    • release it into the environment.

    If you do any of these, penalties may apply.

  • You must take all reasonable and practical measures that are under your control to minimise the biosecurity risks associated with dealing with tropical soda apple. This is part of your general biosecurity obligation.
  • You must report any sightings within 24 hours using 1 of these methods:
  • Each local government must have a biosecurity plan that covers invasive plants in its area. This plan may include actions to be taken for tropical soda apple. Some of these actions may be required under local laws. Contact your local government for more information.

Further information