A TWEED banana grower said a disease that decimates banana crops will be difficult to eradicate in the area because of plants in private gardens.

Banana Bunchy Top Virus is a disease that can destroy the industry as plants infected will not bear fruit.

Aphids spread the disease between plants.

Banana Farmer Winston Shoobridge said there was a program in the Tweed attempting to wipe out the disease but it was difficult.

"They are still finding infected trees in backyards," Mr Shoobridge said.

"Most people wouldn't be able to recognize an infected plant when they saw it."

Mr Shoobridge said an infected plant will get black dots on the leaves and then dark lines down the leaves.

National Banana Bunchy Top Eradication project coordinator David Peasley said ornamental and seeded banana plants in gardens can host a range of pests and diseases, such as Banana Bunchy Top Virus and Panama Disease.

"We understand that ornamental bananas are an attractive plant, but home gardeners or hobby farmers must do their research before planting any type of banana plant," Mr Peasley said.

"Whether you are growing bananas in a residential property or commercially in NSW, every banana grower must obtain a permit to move, plant or cultivate banana plants or planting materials."

Mr Peasley said ornamental growers also needed permits.