Insect & Disease ID Trivia

Re: What Did This?

Yes, the discoloration is quite beautiful when fresh. Becomes muddy within minutes. If the colors could be fixed, this is another disease that would enhance the economic value of affected timber.
 
Re: What Did This?

I'm not very good at this stuff, but I remember something about Verticillium wilt in my college days, staining wood a dark green to black. But I thought it was in twigs.

maybe stains big wood too?

so, Verticillium wilt ?
 
Re: What Did This?

Yes indeed, sapstreak disease it is! Sorry I didn't catch Frax's entry. Me bad.

Most current workers don't accept C. coerulescens as the casual agent and go with C. virescens instead. That's not a criticism, it takes a human generation or two for general textbooks to catch up with current concepts. That's not a new name, or at least the virescens part is what the sapstreak fungus was first called. A later worker considered the bluestain and the sapstreak fungi to be the same species...some years back I wrote a little taxonomic treatment with the story.
 
Re: What Did This?

With respect to Guy's question, static images can be hard to interpret. The attached image is from a sapstreak inoculation study I did some years ago. The image on the left is of a disk from a sugar maple sapling that I drilled a 3/8th inch hole into about 2 years before. On the right is a disk collected at the same time from a sapling that I wounded the same way *but* added an active culture of the fungus right after wounding. The white pin marks where the drill bit entered the sapling. There was some variety in the patterns. This shows the cambial dieback pretty well in the diseased tree.
 

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Re: What Did This?

More info. I realize this image shows symptoms that could be consistent with more than one disease.
Image taken late summer. Leaf colour is abnormal, and usually affects lowest branches first.
Leaf petioles and main veins remain green. Leaves persist through winter followed eventually by branch death. Literature says trees die within 3 to 5 years.
 
Re: What Did This?

frax i have never seen this one, well i have seen nutrient deficiencies with this but not the way you are saying they die in 3-5 years.. i will have to do some research..
 
Re: What Did This?

I've got one but with little data--florida champ live oak, the cellon oak/ This is the upper side of the lowest limb, the tip of which is layering.

What is causing this canker?
 

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Re: What Did This?

I was just at that tree a few weeks ago Guy. I was only on the site for about ten minutes , so I didn't have time to get up into it, but I could see that the tree has lost a lot of big wood over the years.

I wonder if that might have been a combination of mechanical damage from the impact of a large branch further up breaking out and hitting the lower one on the way down, accompanied by sunscald from the loss of the shade from the same branch. Deb also pointed out that, since people could hop onto that branch and walk up it to the union at the trunk, it might also be "visitor blight"

Did you reattach the loose lightning protection cables while you were in it? I'd love to climb that tree! It's a very humbling tree to stand beneath.
 
Re: What Did This?

"I was just at that tree a few weeks ago Guy. I was only on the site for about ten minutes , so I didn't have time to get up into it, but I could see that the tree has lost a lot of big wood over the years."

The 2 big limbs cut were egregious; and apparently done for some twisted view of aesthetics.

"I wonder if that might have been a combination of mechanical damage from the impact of a large branch further up breaking out and hitting the lower one on the way down"

mebbe.

" accompanied by sunscald from the loss of the shade from the same branch. "

mmm still pretty shady there.

" Deb also pointed out that, since people could hop onto that branch and walk up it to the union at the trunk"

Exactly what I did; too tempting to resist.

"it might also be "visitor blight"

Uhhh I do not think mere feet could kill live oak bark.

Did you reattach the loose lightning protection cables while you were in it? I'd love to climb that tree! It's a very humbling tree to stand beneath.

I was itching to go up it but it was a saturday and i did not have time to get busted. next time thru i'll make it a weekday and do er. I am trying to go through official channels for permish but no luck yet.
 
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