The Eastern Wheat Growers is the latest lobby group to come out in support of the proposed constitutional changes that have been put forward by AWB Ltd, which are aimed at dispensing with the company's dual-class share system.
A statement from the group said: "It is questionable, whether the unique AWB structure of A and B class shareholders was ever appropriate (even with a Single Desk).
"What is now very clear, is that such a structure is entirely inappropriate - and in fact, value destroying."
The AWB's current structure will increase the cost of AWB's capital in a competitive market, the group's statement says, and put it at an unfair advantage against its competitors.
"When you are competing against the likes of Cargill, you do not want to be doing so with one arm tied behind your back," it said.