A judge will take his time to make a decision on an internationally significant court case involving an organic farmer who is suing his neighbour for allegedly contaminating his farm with genetically modified canola.
Steve Marsh is suing former childhood friend Michael Baxter, claiming he lost organic certification for more than half his farm after GM canola drifted onto his land from Mr Baxter's adjacent property.
In 2010, Mr Marsh's property in Kojonup, south-east of Perth - which farmed oats, rye and sheep - was certified organic by the National Association for Sustainable Agriculture Australia.
But he alleged GM canola blew 1.5km inside his boundary fence and that caused him to lose his certification.
Mr Baxter claimed when he planted the GM canola, he observed all regulations regarding buffer zones and notifying neighbours.
After a three week trial, which is believed to be the first of its kind in the world, Justice Kenneth Martin reserved his decision, which is expected to be delivered in April.
"Mr Marsh is pleased the Supreme Court trial has wrapped-up and knows it's now in the hands of the judge." said Slater and Gordon Commercial and Project Litigation lawyer Mark Walter.