Q. virginiana w/ Root Rot

xylemxorro

xylemxorro

Location
Central Florida
Good Afternoon All!

Hopefully someone out there can offer some assistance. I went to diagnose a 6.5 dbh Live Oak in SE Central Florida. Obvious signs of root rot, possibly Phytopthora spp.? There are no leaves and dieback has started, but not more than three feet inward. Wood borers/Longhorned beetles have started at the base, but are only six feet up (so far).
There is one two foot branch in the center of the crown with very green foliage. I honestly think this tree can be saved. The small branch is like a sign to me. I have suggested treating systemically with Imicide first (borers), then come back with Arborfos (root rot). I would appreciate any comments, helpful or not. This tree looked like it was a real beauty at one time.
It is on a lot with a newly constructed home. Owner states house was completed about fourteen months ago (on a lake as well). There was soil brought in, but the grade around the oak remained the same. FYI, Oak is very far from lake. A local knowledgable person says it's dead? THANKS ALL!

Shawn
 
Breakdown: No leaves in August, borers, possible construction damage, and signs of Phytopthera. If that isn't a death list I don't know what is.

What is the target rating and would it be possible to take a chance and wait till next bud break to see how much foilage the tree puts on?

jp
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I'm assuming "target rating" would be the value of anything nearby which may be damaged if this tree fails? If that's the case, then about 80K. Detached four car garage w/ at least two cars inside at all times... I'll tell the homeowner either way, money or no money, the best route to take. I just have a feeling this tree will recover. All outer bark is intact and very stable, no hollow sounds or peeling anywhere.
 
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I'm assuming "target rating" would be the value of anything nearby which may be damaged if this tree fails?

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Actually, there is a 10 point numeric system to rate risk.
One of the four components is
"Probability of target impact":
Occasional use
Intermediate use
Frequent use

This situation obviously has a frequent use (home/garage) and therefore high target impact.

-Diane-
 
[ QUOTE ]

"Probability of target impact":
Occasional use
Intermediate use
Frequent use

This situation obviously has a frequent use (home/garage) and therefore high target impact.

[/ QUOTE ]

Wwelll, if it's the median usage (GARAGE, not home, as I read it) then it is moderate, not high, right?
wink.gif


Numbers can be useful, but defect- and target-oriented risk assessment can get so negative as to be panicky. A competent risk assessment looks to both strengths and weaknesses.

It's the lack of leaves that is particularly bothersome here--someone get them a camera!
santa.gif
 
Yes, Guy, I am in complete agreement with you.
My intent was not to be alarmist.
I only wanted to point out what 'target rating' is.
Also, I agree with seeing some photos!

-Diane-
 
yes it is hard to assess anything without a picture! The good news is, live oaks take a lonnnng time to rot.

What 10-point system do you use? The common 12-point system was designed for large populations, not individual trees.

I like a 20-point system with more range for condition, IF numbers are used.

Typically I use words--from very low to critical.
 
Hi, Guy,
I agree using words for value instead of numbers is often easier for people to relate to.

There are several systems and various adaptations, depending on who is using them (municipalities, utilities, private, etc.) which is as it should be (IMO) since each circumstance is so unique and carries its own set of criteria.
(BTW: the 10 pt. system is used by the US Forest Service or so I've been told).

-Diane-
 
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