Top Australian wine regions, containing vineyards owned by Foster's and Moet Hennessey, are under threat from wildfires that have been ravaging the state of Victoria since Saturday.

In the Yarra Valley, Foster's has lost 40 hectares of its vines, Moet Hennessey's Domaine Chandon had 1 hectare of vines burnt, Yering station has lost one vineyard of 8 hectares and boutique producer Roundstone has been completely destroyed. Vineyards at Giant Steps and Sticks were also damaged.

In Heathcote, Rupert's Ridge winery and vineyard was destroyed.

Fires have also struck in the Bendigo, Gippsland and Beechworth wine regions, but continued road blocks and damaged phone lines have made a full assessment of the damage impossible.

Winemakers close to the fire zones have said it will take weeks to discover the extent of smoke damage to fruit still on the vine.

The fire death toll reached 181 Wednesday morning (11 February), but is expected to rise.