A mysterious dieback disease that has devastated mango orchards across the Northern Territory has growers in Western Australia's far north on high alert, weeks out from their picking season.

Mango twig tip dieback (MTTD) was first detected in Darwin crops in 2017 and is now estimated to be costing the Darwin mango industry $7 million a year.

The disease starts as dark lesions on mango twigs then spreads, killing leaves and eventually the whole branch — sometimes the entire tree.

While WA has stringent biosecurity measures and the disease has not arrived yet, farmers are taking precautions.

Steve Angel is WA's largest mango producer with 120,000 Kensington Pride and R2E2 trees on his farm, located on the outskirts of Kununurra, about 3,000 kilometres north of Perth.

Mr Angel said he ha

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