Forest research institute Scion has confirmed it will continue its genetically engineered tree trial and will replace hundreds of genetically modified pines destroyed last month, while police continue to investigate the attack. [...] Scion chief executive Dr Warren Parker says the research is important to the forest industry and the institute has decided the field trial should continue, but under even tighter security. Dr Parker says the cost of replacing the destroyed trees, extra security and lost time, will add up to about $1 million.