Tubakia in burr oak

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John Paul Sanborn

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I was PM'd by Garry Bishop on leaf drop in bur oaks. Seems that Iowa has a problem with Tubakia becoming a leaf blight in bur oaks. The have dubbed it Bur Oak Blight or BOB for short.

Anyone with experiance dealing with it? Seems like cultural practices are all there is right now. The only labeling seems to be for nursery stock at the present.
 
What is Tubakia?
G Bishop, haven't heard that name in a long time, last I remember, he had a enclosed trailer broken into and all his gear was stolen. Met him at a Vermeer expo in East Moline ILL
 
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Thanks brnchbrkr, but I was kinda looking for it in JPS's words, I have seen it (looked at the pics on the Link), was thinking it was Anthracnose and it may still be. Oaks have been taken it from all sides here, lots of Blight, Anthracnose or Tubakia, Scales on the Pin Oaks is the worst I have ever seen. Have a client who is loosing Oaks every year, even trenched the roots to prevent spread, think it was a little too late, not to mention uprooting from all the rain, which brings me to this conclusion. It is the weather that is helping all of this, with it raining HARD every couple of days and the dew point above 70, heat index above 100,these are perfect conditions for all of these Oak ailments, not that they are only effecting the Oaks, but they seem to be getting hit the hardest. Am I wrong?
Something else I have been noticing, that I have a Q about. This year, it seems every time I work on a Oak, the wood has MASSIVE amounts of Iron spots in the wood, the big blueish black spots int the heartwood, Have never seen so much of it,one of them was 20" in dia (the spot). They all have been dead when I first see them, so I cant tell what the tree was like before. Is there a connection between the weather and the iron grabbing a hold of the Tannin? And if it a tree produces a bunch of tannin, does that effect the amount of Iron the tree gets?
Does not help when one of the other CA's in the area is constantly pruning Oaks, seen him yesterday working on a Bur.
 
I was PM'd by Garry Bishop on leaf drop in bur oaks. Seems that Iowa has a problem with Tubakia becoming a leaf blight in bur oaks. The have dubbed it Bur Oak Blight or BOB for short.

Anyone with experiance dealing with it? Seems like cultural practices are all there is right now. The only labeling seems to be for nursery stock at the present.

i had a client yesterday want a white-post oak hybrid whacked because lower leaves were affected. i told her to hang bird feeders to distract her eye from the temporary problem. selective raising and thinning will be the likely compromise.
 
MuscatineAerial2007d.preview.jpg

MuscatineAerial2007

This seems to be going beyond a minor leafspot, the above is an aerial short from Iowa DNR, the discolored canopy is all burr oak.

From my reading yesterday and my correspondence with Gary, I tend to agree with Scott. I do wonder how many are being cut down from leafdrop but have not had bud/twig analysis to see if they are dead, what with all the saw happy clowns I hear about.

With it being a late summer disease, it is not surprising that it has crossed the economic threshold with the wet, humid weather that the region is not used to.
 
you mean *aesthetic* threshold, right?

who loses money on lateseason leafspot?

how's the job scene? :biggrinbounce2:
 
you mean *aesthetic* threshold, right?
Aesthetic is when you have to move the bird feeder because the buds are green. Economic is when you have to prune out dead limbs, or remove a dieing tree.

who loses money on lateseason leafspot?
When the white jackets rename it to a blight and the state forestry people get worried about timmber stocks.

how's the job scene? :biggrinbounce2:

Work is slow enough that I've answered a few calls, though i do not talk about it much.

I'm not sure which way I want to go, the consulting is starting to pick up a wee bit and I have some new clients on the roster. There just is no consistency in the flow right now. A couple of the job openings have been interesting, but I'm not the only under-employed tree guy right now.
 

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