AWB issued several strongly worded statements attacking WAFarmers over its conflict of interest with rival grain marketer Emerald, as the public affairs campaign went into overdrive.

WAFarmers responded with equal veracity, claiming there was no conflict of interest with their relationship with Emerald via the operation of an exclusive wheat pool this year.

AWB also chose to highlight errant comments made by WAFarmers Grain Council president Derek Clauson while speaking during in an ABC radio interview on Friday.

AWB issued a media statement on Monday, highlighting the interview and, in particular ,where Mr Clauson had said that the "best commercial offer" would determine how many growers would deliver their wheat to in the new marketing environment – and not blind loyalty based on their A-class shareholding in the AWB.

Mr Stewart said the WAFarmers Grains Council's campaign to oppose AWB's constitutional reform to ensure ongoing grower loyalty was "fatally flawed".

"The commercial strategic alliance between WAFarmers Grains Council and Emerald Group demonstrates that A-class shares in AWB does not ensure grower loyalty," he said.

"It is time to take the agri-politics out of wheat marketing to ensure AWB is in the best possible position to offer Australian wheat growers the most competitive commercial offer this harvest. "

On Friday, WAFarmers said the results of a poll currently being run on Rural Press' Farming Online website showed growers were concerned by Mr Davis' attempts to abolish A-Class shareholders from AWB's corporate structure.

The poll asked: "Will the abolition of AWB's dual share system result in growers' interests being put second to those of the shareholders?"

At noon on Friday, the poll had 290 votes of which 69pc of respondents believed that their interests would be secondary with the abolition of the AWB's dual share system.

Mr Clauson said that the results spoke for themselves.

"While Mr Davis would try to make us believe otherwise, this poll shows that Australian grain growers are concerned at his attempts to abolish A-class grower shareholders from AWB's constitution," Mr Clauson said.

"This is a concern also held by WAFarmers which is recommending to members and grain growers generally to vote against the motion to remove Article 2 from the AWB constitution."