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If the trees came from the same nursery, which they probably did, they could all have poor root systems.  Not necessarily roots girdling the trunk, but not spreading out to be able to capture enough water to survive.  Planting depth - too deep -  is another issue that happens frequently.  I'm thinking more along the terms that they just didn't have a spreading root system to gather water.  How much water was applied -- 1/4 inch wouldn't do much good.

 

Jane Morse | Commercial Horticulture Extension Agent | Pinellas County UF/IFAS Extension 
12520 Ulmerton Road | Largo, FL  33774 | PH: (727) 582-2562 | [log in to unmask] 
 
The University of Florida Pinellas County Extension invites you to visit our newest 
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Extension programs are open to all persons without regard to race, color, sex, age, disability, 
religion, or national origin.

-----Original Message-----
From: South Central Green Team Discussion List [mailto:[log in to unmask]] On Behalf Of Palmer, Dave
Sent: Wednesday, June 08, 2011 4:08 PM
To: [log in to unmask]
Subject: Re: oak tree problem

Those are good ideas Jane.
But it's unlikely that several trees would suffer circling roots at the same time.
I didn't look at the roots below ground but no conks or anything unusual was showing above ground.

Dave Palmer
Commercial Horticulture
Manatee County Extension
1303 17th Street West
Palmetto, FL 34221
941-722-4524 x 226
[log in to unmask]
http://manatee.ifas.ufl.edu/comm-hort/
Blog - http://prohortmanatee.wordpress.com/
________________________________________
From: South Central Green Team Discussion List [[log in to unmask]] on behalf of Morse, Jane [[log in to unmask]]
Sent: Wednesday, June 08, 2011 1:33 PM
To: [log in to unmask]
Subject: Re: oak tree problem

The cross section looks similar to palms with ganoderma.  Did you get a chance to look at the roots?  Wondering if they were circling as if still in the pot.  That would account for water stress even under irrigation.



Jane Morse | Commercial Horticulture Extension Agent | Pinellas County UF/IFAS Extension
12520 Ulmerton Road | Largo, FL  33774 | PH: (727) 582-2562 | [log in to unmask]

The University of Florida Pinellas County Extension invites you to visit our newest
interactive feature at www.askextension.org

Extension programs are open to all persons without regard to race, color, sex, age, disability,
religion, or national origin.
-----Original Message-----
From: South Central Green Team Discussion List [mailto:[log in to unmask]] On Behalf Of Palmer, Dave
Sent: Tuesday, June 07, 2011 11:44 AM
To: [log in to unmask]
Subject: Re: oak tree problem

I think they're laurels. But they're under irrigation

Dave Palmer
Commercial Horticulture
Manatee County Extension
1303 17th Street West
Palmetto, FL 34221
941-722-4524 x 226
[log in to unmask]
http://manatee.ifas.ufl.edu/comm-hort/
Blog - http://prohortmanatee.wordpress.com/
________________________________________
From: South Central Green Team Discussion List [[log in to unmask]] on behalf of Caldwell,Doug L [[log in to unmask]]
Sent: Tuesday, June 07, 2011 10:57 AM
To: [log in to unmask]
Subject: Re: oak tree problem

Have been seeing some of this too on live oaks; yours look like laurel oaks?

I don't think it is disease. I've been chalking most of it up to dry, dry, dry conditions and girdling roots. But the trees with the lower branches browning first is puzzling. MaNY OF THE BRANCHES HERE, WHICH HAD BROWNING, ALSO HAD GREEN BUDS OR CAMBIUM...(HATE THAT CAPS KEY!).....


"Helping you beautify your landscape and protect the environment!"
Doug
Doug Caldwell, Ph.D.
University of Florida
Collier Co. Extension (a Public Services Department)
Commercial Landscape Horticulture
Landscape Entomologist
14700 Immokalee Rd.
Naples, FL 34120
239-353-4244  x203
c: 239-273-0073
FAX: 239-353-7127
http://collier.ifas.ufl.edu/CommHort/HomeCommHort.shtml

________________________________
From: South Central Green Team Discussion List [[log in to unmask]] On Behalf Of Palmer, Dave [[log in to unmask]]
Sent: Tuesday, June 07, 2011 9:29 AM
To: [log in to unmask]
Subject: oak tree problem

I have an oak tree problem that has me stumped.
At first glance it looks like a pesticide problem, but the evidence is muddy at best.

Images are at http://manatee.ifas.ufl.edu/tree1.htm
Clicking on an image will enlarge the image (these are large images).

Dave Palmer
Commercial Horticulture
Manatee County Extension
1303 17th Street West
Palmetto, FL 34221
941-722-4524 x 226
[log in to unmask]<mailto:[log in to unmask]>
http://manatee.ifas.ufl.edu/comm-hort/
Blog - http://prohortmanatee.wordpress.com/
K