Only 370,000 tonnes of grapes were harvested during the 2021 vintage.
The wine giant's parent company was placed into receivership this week.
"There's been a lot of mental stress in the industry."
Reports indicate the quality of the wine harvest so far this year is exceptional.
If vines can't be cropped there will be huge losses for the sector.
"We just don't think there's going to be enough people on the ground to get through that pruning period as efficiently as we would like."
"The last thing we want to see is our grapes rotting on the vine. The industry needs workers now."
The sector has thrived, despite the challenges posed by the COVID-19 pandemic.
The company said the winery was "no longer suited to [its] ambitious growth plans".