TRADERS in Liskeard say a planned £110 million retail park in St Austell threatens to damage their businesses.
The Coyte Farm development to the west of St Austell at St Mewan would create a retail area larger than St Austell town centre if plans are approved next year.
The development threatens businesses across Cornwall and could see trade dropping by 7.2 per cent in Liskeard alone, according to a report by campaigners.
The Liskeard Town Team met last Monday to discuss the implications of the proposed development on the town.
Sally Hawken, Cornwall councillor for east Liskeard, said: "It has a potential impact on Liskeard and we will not be supportive of it.
"It's a big development that will pull in trade from other areas as well as Liskeard – we aren't happy with it."
A campaign has been launched against the proposed development called Stop Coyte Farm, which has attracted 4,430 signatures.
According to opponents the proposed development will take 12.5 per cent of Bodmin's trade and 13.5 per cent of Newquay's.
The plans include a 100,000sq ft Sainsbury's superstore and an additional 160,000sq ft of non-food retail units.
Liskeard Chamber of Commerce said there are fears that the development could lead to £1m being lost from the town's economy.
Jane Pascoe, Liskeard Chamber of Commerce secretary, said: "The new development will not create many extra jobs – this is an empty promise.
"There will be displacement of employment from the centre and also from Truro to this massive out-of-town Coyte development.
"If the development is allowed, there will be uncertainty about the future of all the Cornish towns.
"Liskeard Chamber of Commerce urges councillors on the planning committee, in the strongest of terms, to carefully consider the full implications of this application or Cornwall will only have ghost towns and not friendly town centres to attract visitors."