whats this on evergreen trees?

[mrtree]

I think canker is vastly underestimated as a defect, likely because very few actually examine cross sections as shown above.

[Tony Croft aka hamadryad]

I think canker is vastly underestimated as a defect, likely because very few actually examine cross sections as shown above.

 

i think Claus has it right in some cankers, like those large burr like ones on main stems, but target cankers, ash cankers, and poplars also ones like this one certainly need to be paid attention to.

[treeseer]

Gorgeous picture of tree-fungus interaction; thanks!

 

In absence of fruiting bodies, Nectria sp. is often thrown out as a guess in the US. Tony you may be right about compression buckles being a primary entry point; that explains the location of the majority i see here.

 

Did you notice how far above and below the buckle the fungal activity went?