Summary of three major diseases of oak trees in Texas

DISEASE
Oak Wilt Oak Decline Hypoxylon
Principal trees
affected
Texas red oak and live oak All oaks Post oak, Texas red oak and water oak

L
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Characterstic symptons
  • Chlorosis and necrosis along veins with marginal necrosis on some leaves
  • Reduced leaf size and twig die-back in crown of tree
  • Leaves turn brown overall
Shredding Yes No Retained for a short time

Rate of death Rapid (Texas red oak: 7-30 days; Live oak: 30-60 days) Slow (2-8 years) Trees appear thin and yellow for several weeks. In final stage which lasts 1-2 weeks trees go from yellow to brown

Spreads through rootgrafts Yes Unknown No
Trees affected Healthy Stressed Stressed

Control
Measures
Isolation Yes Yes No
Chemical No Yes No
Cultural No Yes Yes

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