More of the Annual Parade

Oak Wilt Information

For more information contact LCNA Oak Wilt Committee Chair Jennifer Lamm Please contact by email, not phone.

Current disease centers in Lost Creek — as designated by Texas Forestry Service

Oak wilt disease centers are in red on map:

What you can do

  • Prune trees properly
    • Prune only in the hottest summer months of July/August.
    • Seal all pruning cuts immediately and insist on watching tree trimmers do this.
      • Pruning seal or latex spray paint works well.
    • Sanitize all trimming equipment BEFORE starting work and insist on watching tree trimmers do this. Lysol disinfectant is an effective sanitizer
  • Red Oak infection
    • Contact Texas forestry ASAP and remove tree properly.
  • Live Oak infestation
    • Do it yourself treatment
    • Arborist treatment
  • Plant Oak wilt resistant trees.
  • Educate neighbors on all of the above

Signs of oak wilt

If you suspect oak wilt contact a certified arborist. http://www.texasoakwilt.org/Vendors/vendor.php

Red Oaks — note that stems are no longer green on these leaves.

Wilting leaves turn pale green or brown over entire tree.

There is a state cost share program for removal of oak wilt diseased red oaks.

Live oaks — veinal necrosis — yellowing or darkening of the veins of the leaves.

Tree will tend to thin in the crown (top) first.



Oak wilt fungus affects primarily

  • Red oaks
    • Spanish
    • Red (Texas)
    • Shumard
    • Black Jack
  • Live oaks

White oaks are not as drastically affected.

Oak wilt spreads through

  • Root transmission
    • Roots grafted together or that were interconnected from inception.
    • Rate of spread through the roots is 50-100 ft per year.
  • Open (unsealed) wounds and cuts
    • Nitidulid beetle attracted to open wounds transmits fungus.
    • Contagious Fungal mats (only on red oaks).
  • Human transfer
    • Improperly sanitized tree trimming equipment.

Treatment of infected trees

  • Alamo (or generic) fungicide through Macro infusion. http://www.texasoakwilt.org/Professionals/Injection/injection.html
    • More effective on live oaks than red oaks.
    • Fungicide treatment is not a cure and does not stop spread.
    • Fungicide treatment helps the treated tree fight the fungus and survive.
    • Fungicide is not 100% effective.
  • Timing of treatment is important.
    • Once tree is showing signs of infection, treatment less successful.
    • Treat when trees are within 100-200 ft of infected ones.
    • Communicate with neighbors when you treat.
    • Fungus continues to spread through roots at 50-100ft/year.
  • Trenching a loop of containment 100ft outside of infected trees.
    • Costly.
    • Most effective if done properly.

For More Information See Texas Oak Wilt Partnership Site

See also:

Trees are good http://www.treesaregood.com/ (recommended by Eric Beckers)

Eric Beckers, Texas Forest Service
ebeckers@tfs.tamu.edu
512-339-3772