The murder of a farmer in Hartbeesfontein, North West, was proof that the government had lost control of crime, FF Plus leader Pieter Groenewald said on Tuesday.

"The unwillingness and laxity of government is proven in that it is unwilling to declare farm murders a priority crime as the Freedom Front Plus has been asking for a very long time," he said in a statement.

"Further proof is that the rural safety plan of the police has still not been implemented."

Three men ambushed Ronel van Eyk (46) at the gate of her farm on Monday morning. They asked her to open the gate, and when she was about to do so, shot her. They fled in her white Toyota Venture. She died on her way to hospital.

Groenewald said the government was showing contempt for the farming community.

"There have been so many conferences and meetings on farm attacks and farm murders, but nothing concrete has come from it," he said.

"Through this the government is making itself an accessory to farm murders."

Groenewald said the party would continue asking Parliament to declare farm murders a priority crime.

North West police spokesperson Brigadier Thulani Ngubane said no arrests had been made and investigations were continuing.

Farmers union Tau SA called for foreign intervention in farm murders.

"Tau SA is going to call on the US ambassador to South Africa to put pressure on the South African government to address the farm attacks," the organisation's deputy president Henry Geldenhuys said.

He said the union had made good progress in informing the international community of the nature and extent of farm attacks in South Africa.

"Our pleas to the government are falling on deaf ears."