Setting out SWA's case at the Court of Session, Aidan O'Neill QC argued the policy would hit poor drinkers.
With an estimated 3, 500 hybrids in Scotland the SWA said this would mean there were just 35 wildcats remaining.
BBC: Scottish wildcat extinct within months, association says
The Scotch Whisky Association (SWA) and several European wine and spirits bodies are seeking a judicial review of the legislation.
An SWA statement said the experience of Canada, where there is no minimum unit pricing, was different to that in Scotland.
BBC: Study claims minimum pricing cuts alcohol-related deaths
The plan is being challenged by the Scotch Whisky Association (SWA) both at the European Commission and through the Scottish courts.
Governments, donors and civil society need to unite and demonstrate a high level of support for the Sanitation and Water for All partnership (SWA).
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The fall in drink exports was reflected in recent figures from the Scotch Whisky Association (SWA) which said overseas sales stalled in the first half of this year.
Of the 2, 000 records of hybrids and wildcats looked at by the SWA team less than 20 were deemed to comply with the accepted coat-marking identifiers of the true wildcat.
BBC: Scottish wildcat extinct within months, association says
Mr Piper said SWA and Oxford were sending people to Caithness and Sutherland, which he said was the one large area that had not been looked at in any real detail.
BBC: Scottish wildcat extinct within months, association says
However, the government has undertaken not to introduce the measures until after the conclusion of the challenge brought at the Court of Session in Edinburgh by the Scotch Whisky Association (SWA) and several European wine and spirits bodies.
BBC: Study claims minimum pricing cuts alcohol-related deaths
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