AWB chairman Brendan Stewart accused WAFarmers of disregarding good governance by arguing in favour of retaining the dual-class share structure.

"WAFarmers Grains Council has failed to acknowledge its conflict of interest in wheat marketing and continues to push the fundamentally flawed argument that A class shares enshrine grower loyalty," Mr Stewart said.

"It's time to stop using AWB as an agri-political football.

"For WAFarmers Grains Council to argue that A class shares generate grower loyalty when it has entered into a strategic commercial alliance with an AWB competitor - the Emerald Group - is a bit rich.

"If A class shares really generated grower loyalty, then WAFarmers Grains Council would have entered into a strategic commercial alliance with AWB rather than a competitor in which its holds no shares."

Mr Stewart said AWB remained the only company on the Australian Stock Exchange with an out-dated and costly dual shareholding structure, after growers voted to redeem A class shares in both ABB and Graincorp in recent years.

"WAFarmers Grains Council should also acknowledge that two of the three AWB Limited Directors in WA support AWB Constitutional reform," Mr Stewart said.

"They should also recognise that 62pc of WA growers supported constitutional reform at AWB's AGM in February."