Callous roll

[klimbinfool]

This is a pic of a Blue Oak, The next few shots are of years of callous rolls on a old stob. Or is this just growth rings apparent?

Thanks
Greg

 

[klimbinfool]

no sun

 

[klimbinfool]

side view of stob.

 

[klimbinfool]

front view of stob.

 

[tophopper]

that is pretty bizarre lookin, ive never seen callous ridges all stacked up like that before, well not that extensivly anyway. Nice shots!

 

[Eric_E]

Could it be a type of canker? I've seen cankers that look similar to that.

 

[tophopper]

I ve seen a large target canker similiar to that , but not in a collar like that, just weird

 

[klimbinfool]

Most target canker that I have seen is usually down in the lower trunk section to th root flare. But who knows. Maybe someone can give us a different insight on this .

Thaks
Greg

 

[glens]

That was a real treasure you found!

I think what we have here is a female of the species and the old gal just couldn't make up her mind.

 

[Teti]

i have a sasafrass that has the same thing all over it.

 

[klimbinfool]

Well, Top Hopper may be right as far as Target Canker goes. Athough, I only saw one on this tree and that was were a old limb had fallen off. I've also seen stuff like this on Scarlet Oaks, but the So called cankers outside edges were very distorted and out of round. Kind of why I didnt think this was Target Canker, but hey , I'm weak in this part of the field, so I'll let someone else make the determining decision.

Greg

 

[treebear]

Found one simular today when felling an old ash (fraxinus exelcior). I cut it longitudional and found that it was a shedded branch where the callus had died and started growing again multiple times, possibly because agressive pathogens have crossed the barrier zone and killed the callus from inside. As you can see on pic one there is new callus growth on the edge of the canker. Pic two shows from the longitudional cut where you can see the remains of the branch in the middle, pic three is from the other side to show that the callus growth extends about 5cm from the trunk. It was an old tree that also had longitudional cracks showing the same pattern of dying regrowth. My guess is that the tree is infected with some kind of fungus, anyone got any idea of which specie?
Svein
www.hogstogrydding.no

 

[treebear]

pic two
Svein
www.hogstogrydding.no

 

[treebear]

Pic three
Svein
www.hogstogrydding.no

 

[Tom Dunlap]

I saw a lot of that on NOrway Maples, especially Crimson King's. I told my students that it was a 90% chance of getting that right on a dormant test for tree ID.

I've heard it called cobra head canker. Eutapella [sp?] might be a possibility.