This research article covers the usage of SPORL pretreatment of pine trees killed by mountain pine beetle and whether or not it is easier to overcome recalcitrance of lignin in these trees in comparison to live trees.
Follow this link to learn more: http://www.mendeley.com/research/evaluation-mountain-beetleinfested-lodgepole-pine-cellulosic-ethanol-production-sulfite-pretreatment-overcome-recalcitrance-lignocellulose/