i think that the rot in eucs might have something to do with development whether it be raising soil levels,root disturbances,over zealous fertilizing(australian natives cant handle too much nitrogen),poor pruning;polarding doesnt agree with eucs at all. all this will create stress in tree and will then attract pathogens such as bracket funghi which will attack heart wood on any part of tree.armilaria and pytophoria also like stressed eucs but they attack via the roots.
trees in their native environment/country also tend to have their natural preditors be it a pest or disease.introduced species seem to thrive and often end up in plague proportions.
also eucs dont live to great ages,young in comparison to a lot of trees and older ones drop limbs causing tree damage/cavities ie.weak spots that disease love.
i have seen some pics of established blue gums in the US and and they look so healthy and big.
trees in their native environment/country also tend to have their natural preditors be it a pest or disease.introduced species seem to thrive and often end up in plague proportions.
also eucs dont live to great ages,young in comparison to a lot of trees and older ones drop limbs causing tree damage/cavities ie.weak spots that disease love.
i have seen some pics of established blue gums in the US and and they look so healthy and big.