This follows a stand-off between neighbouring properties over locust spraying on a wheat farm in the state's south.

Representatives of Ardlethan district near Wagga Wagga will put a motion to the NSW Farmers Association conference in Sydney, calling for measures to ensure conventional farmers do not suffer financially because of organic neighbours.

"Conventional farmers are happy to live side by side with organic farmers but it shouldn't be at their cost," Ardlethan District Council chairman Kathy Maslin said.

Association president Jock Laurie said conflicts about use of fertilisers, spray drift and pest control occur because normal business practices on farms are "in many ways contrary" to organic methods.

The motion calls for organic status to be granted only if all neighbours are informed first, and for spray buffer zones to be located inside organic farms and not required of their conventional neighbours. The motion stems from an incident last year at Kamarah, near Ardlethan.

Bradley Richens was told by his organic farming neighbours, Helen and Laurence Taylor, that he could not spray chemicals to kill locusts that were invading his property and he should check with their registration organisation, Australian Certified Organic, before acting.

"When I rang the organic association, all they give you is guidelines - I couldn't enter their property, I couldn't spray any chemical," he said.

Mr Richens did spray the insects for two weeks. He said he had never previously been told the Taylors' farm was organic.

There have been large payouts in some cases where farms have been contaminated by neighbours' activities, leading them to lose their organic certification, the chief executive officer of Biological Farmers of Australia, Andrew Monk, said.