Solanum viarum

Solanum viarum, the tropical soda apple, is a perennial shrub native to Brazil and Argentina with a prickly stem and prickly leaves. The fruit is golf-ball-sized with the coloration of a watermelon. It is considered an invasive species in the lower eastern coastal states of the United States and recently on the Mid North Coast of Australia.Seen in the Southern Peninsula area of Cape Town as of 1 November 2014. This species has several synonyms, one of which is particularly ambiguous: The tropical soda apple leaf beetle (Gratiana boliviana) has been used successfully as an agent of biological pest control to reduce the abundance of this plant in the United States, particularly in Florida.