Western Australian Agriculture Minister Kim Chance has attacked a Melbourne University Professor’s claims that Australian farmers are missing out because of state moratoriums on genetically modified (GM) crops. Professor Rick Roush has co-authored a report which suggests there has been a 30 per cent boost in yields from GM crops in Canada in the past decade, but Australian yields have declined. But Mr Chance says the claims are unscientific and wrong and there is no firm evidence of potential yield increases from using GM crops in Australia.