White wine grape oversupply 'another kick in the guts' for growers already in crisis

Green chardonnay grapes sit on vines in bunches.

Wine grape growers are preparing for white grape prices to be at their lowest in recent years. (ABC Riverland: Shannon Pearce)

In short:

South Australian white wine grapes are set to be in oversupply this vintage.

Early indicators show prices are at historic lows, with some grape varieties plummeting in value.

What's next?

Riverland Wine has written to the SA government asking for help as it says the industry heads into "catastrophic" territory.