Global agribusiness Monsanto contributed to a West Australian farmer's legal costs in a battle over alleged contamination of his neighbour's organic crop, the company has confirmed.

Steve Marsh took his neighbour Michael Baxter to court over alleged contamination of his canola crop in 2010 by seeds from Mr Baxter's property.

He claimed GM canola seeds blew over the fence from his former childhood friend's field during a harvesting process known as swathing, which resulted in the loss of organic certification of 70 per cent of his land.

In May last year, the WA Supreme Court threw out Mr Marsh's claim and awarded Mr Baxter more than $800,000 in legal costs.

However Mr Marsh appealed against the decision, and last month the Supreme Court ordered Mr Baxter to disclose any financial help he received from Monsanto and the Pastoralists and Graziers Association.

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In a statement, Monsanto said the legal dispute had been difficult for the families and communities involved.

"It is regrettable that neighbours and friends ended up in court and it is the last thing anyone in Australian agriculture wants to see," the statement, attributed to Monsanto Australia's managing director Daniel Kruithoff, said.

"Both farmers were entitled to seek support for this legal dispute so that their arguments could be heard in court.

"It was only fair that the Baxters received much needed support given the extensive fundraising efforts of Steve Marsh's supporters.

"Monsanto Australia contributed to the Baxters' legal costs to ensure they could defend themselves in court."

Monsanto's support was limited to contributing to legal costs, and the company had no control over the management of the case, the statement said.

Mr Kruithoff refused to reveal how much money the company had contributed towards Mr Baxter's legal costs so far, but said its financial support would be ongoing during the appeals process.

"We were approached by Baxter's lawyers early on to understand if we would provide support and as they were our customers, we were very happy to support them," he said.

Mr Marsh's campaign was financially backed by the Safe Food Foundation, with the foundation's director Scott Kinnear saying at the start of proceedings it had sunk at least $750,000 in the lawsuit.

'Defend technology when it is attacked'

John Snooke of the Pastoralists and Graziers Association said he was unaware of Monsanto's contribution but happy they were involved.

"It has come as a surprise to us ... but we need providers of technology in agriculture to defend that technology when it is being attacked," he said.

"Michael Baxter had to defend himself.

"He had used a legal technology, the State Government is happy for grain growers to use GM canola, so he did need help."

Malcolm McCusker, the lawyer for Steve Marsh, declined to comment.

The Safe Food Foundation and Mr Baxter's legal representatives have been contacted for comment.