The deputy president of the Irish Farmers Association has said that any backtracking on the Common Agricultural Policy would lead to “total and absolute uproar“.
Britain and France are at loggerheads over Tony Blair's demands for the 2002 deal on agricultural produce to be renegotiated.
“Farmers will not stand for it,” Mr Ruaidhri Deasy said.
“I will lead a pan-European protest in which the IFA and all other EU farming organisations will shake the EU to its foundations.”
Britain won a €4.5m euro cut on its contributions to the EU in 1984 because it gained little from agricultural subsidies.
However Mr Blair said he is only to willing to consider France's demands to reduce the rebate if talks on CAP are reopened.
Mr Deasy, whose father Rickard lead a famous 30,000-strong farmers protest to the Dáil in 1966, said: “Farmers across Europe will unite to fight this just like Irish farmers united in the 1960s.”
A 20-day sit-in outside Agricultural Minister Charlie Haughey's office finally secured formal negotiating rights with government. Mr Deasy said the 2002 CAP deal is legally-binding and could be defended in the European courts.
“A contract is a contract. It is a legally binding agreement that millions of farmers in the EU signed up to. “To have a contract torn up while farmers across Europe are trying to work within its framework is not only unfair but illegal and the fight could be taken to the European courts themselves,” he added.
The IFA official, whose organisation represents 85,000 farmers, also accused Mr Blair of posturing to his urban power base. Mr Deasy added: “For the EU to survive in the years ahead it must be able to produce as much as it consumes.
“A secure supply of safe food, jobs, alternative sources of fuel, raw materials and a clean environment are key components in any sustainable model for our future. “A strong farm and rural sector is therefore vital for all of us. It is high time we woke up and recognised that fact.
“Otherwise our leaders are sleepwalking us as farmers onto a path of collapse and poverty.”