How it is spread
What can be done
All oaks are at risk of contracting Oak wilt, with white oaks such as Bur and Monterey being less susceptible. It is important to monitor the health of your oak for broken limbs, leaf abnormalities, pest infestation, etc and contact a certified arborist for a consultation. Preventative and therapeutic treatments are available, as well as Do-it-Yourself kits. There is no known cure for Oak wilt, but that doesn’t mean they cannot be protected from getting it. It is a small investment when you consider the other alternatives.
CONFIRMED: OAK WILT IN LACEY OAK AND MONTEREY OAK IN KERR COUNTY!
How to identify Oak wilt
New Leaves and VN
Old leaves showing veinal necrosis coexist with new leaves (not showing symptoms yet) put on in the spring.
VN and VB
This leaf has a combination of both VN and VB.
This symptom is similar to margin burn, but only the ends of the leaf turn brown. .
Fungal Mat Remnant
Shown is the remnant of an Oak Wilt fungal mat on a long dead red oak. This spore mat is no longer an infection hazard becaShown is the remnant of an Oak Wilt fungal mat on a long dead red oak. This spore mat is no longer an infection hazard because it has dried out. use it has dried out.
This is an example of how veinal necrosis is typically presented on a leaf.
When veinal banding occurs, the veins remain a normal green color and the remainder of the leaf turns pale.
Bronzing Red Oak
One of the symptoms of Oak Wilt in red oaks is an apparent bronzing of the leaves as shown here.
Fresh Fungal Mat
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VN on a Red Leaf
Some Live Oaks turn a dark red color prior to dropping their leaves in the spring. Veinal necrosis on this leaf shows up bright red.
Veinal Banding (VB)
Veinal banding or inter-veinal necrosis is shown here. The yellowing of the area between the veins is not common but really helps to illustrate the symptom.
Tip Burn in Red Oak
Another common symptom of Oak Wilt in red oaks is tip burn.
Veinal Necrosis (VN)
This example shows how the veinal necrosis can be finely detailed throughout the leaf.
Margin burn is a symptom of oak wilt where the edge of the leaf turns brown. These leaves also have veinal necrosis.