Oak Wilt?

ANTI- · 18th July 2010, 01:59 PM

I am looking for a little help on diagnosing one of my red oaks. I am concerned it has been infected with oak wilt.

I live in the north Dallas, Tx area and have heard there have been recent outbreaks of oak wilt in the surrounding area.

I just noticed in the past few weeks the tree has appeared sick due to change in leaf color.

Thanks for any advice and thoughts.

Jeff Darby · 18th July 2010, 02:24 PM

Quote:

Originally Posted by ANTI-

I am looking for a little help on diagnosing one of my red oaks. I am concerned it has been infected with oak wilt.

I live in the north Dallas, Tx area and have heard there have been recent outbreaks of oak wilt in the surrounding area.

I just noticed in the past few weeks the tree has appeared sick due to change in leaf color.

Thanks for any advice and thoughts.

Quote:

Oak Wilt
Research Issue

Oak wilt, caused by the exotic fungus, Ceratocystis fagacearum, is one of the most serious diseases of oaks (Quercus) in the Midwest and kills tens to hundreds of thousands of oak trees every year. Infection by the fungus causes clogging of water conducting vessels, leading to wilt and death of infected trees. Red oaks are more susceptible than white oaks and can die within several to many weeks. Spread of the causal fungus from diseased to healthy trees occurs both above and below-ground. New infection centers are created when certain species of sap beetles pick up fungal spores from infected trees and carry them to healthy trees. If these beetles land on fresh wounds (e.g. such as those resulting from storms or tree pruning), the tree will likely become infected. Below-ground spread occurs when the fungus is carried through the water conducting system from diseased trees to healthy ones through grafted roots.
Our Research

Our research ranges from specific studies on basic questions concerning insects involved in overland spread of oak wilt to integrating our scientific and experiential knowledge in management guidelines developed by state land management agencies. Some examples of our research are:
1) determination of the principal insect vector species involved in overland transmission of the oak wilt fungus in the Central United States,
2) use of the systemic fungicide propiconazole to prevent root graft spread of the causal fungus in red oaks,
3) determination of the success rate of mechanical root graft disruption (using vibratory plow) to stop spread of oak wilt in operational disease control programs and comparison of models for locating the root graft disruption lines, and
4) contribution of scientific expertise to the development of statewide guidelines (Wisconsin) to minimize oak wilt threat during timber harvesting activities.
Expected Outcomes

Our goal is to provide natural resource managers of state, county and urban forests with new or improved tools for integrated management of oak wilt.

source :Google Image Result for http://www.nrs.fs.fed.us/disturbance/invasive_species/local-resources/images/oak_wilt_200.jpg

R.Boreal · 8th October 2010, 12:04 AM

Quote:

Originally Posted by JayD

source :Google Image Result for http://www.nrs.fs.fed.us/disturbance/invasive_species/local-resources/images/oak_wilt_200.jpg

Please correct if mistaken - I believe this to be oak wilt on a bur oak in SE Pennsylvania. Shows all the classic signs - split bark, quick death. And I believe I saw a spore mat inside one of the bark pieces. This is the second tree on this property to be infected, first was next to this one and has already been taken down. Also I had one on my own property that succumbed as well. Shame - big beautiful tree.

18th July 2010, 01:59 PM	#1
ANTI- I'm new here so be nice Join Date: Jul 2010 Location: Dallas, TX Posts: 1	Oak Wilt? I am looking for a little help on diagnosing one of my red oaks. I am concerned it has been infected with oak wilt. I live in the north Dallas, Tx area and have heard there have been recent outbreaks of oak wilt in the surrounding area. I just noticed in the past few weeks the tree has appeared sick due to change in leaf color. Thanks for any advice and thoughts. Attached Thumbnails

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