Incoming agriculture minister Terry Redman says a cautious approach must be taken towards the introduction of genetically modified food crops in WA, acknowledging that consumer concerns remain over the controversial technology. The Nationals MP also cautioned key broadacre farmer groups who are pushing for commercial GM canola trials by next year that the time frame was ambitious. [...] Mr Redman, who will be sworn in as agriculture minister next week, said adequate segregation systems for GM and non-GM grains needed to be in place before commercial trials took place.