An environmental watchdog is calling for public submissions on a plan to field test genetically-engineered pine trees “in containment” at Rotorua. [...] State science company Scion wants to test genes influencing plant growth, reproductive development, herbicide tolerance, biomass utilisation, wood density and stability, in 4000 trees on a four hectare site. The field test will last for 25 years, though each tree will be grown only for a maximum of eight years.