Garbelotto and Rizzo Labs U.C. Berkeley U.C. Davis Close Menu

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O'Brien, Joseph USDA Forest Service Image 1427094 Invasive and Exotic Species of North America http://www.invasive.org Close Menu

Garbelotto and Rizzo Labs U.C. Berkeley U.C. Davis Close Menu

O'Brien, Joseph USDA Forest Service Image 1427093 Invasive and Exotic Species of North America http://www.invasive.org Close Menu

O'Brien, Joseph USDA Forest Service Image 1427046 Invasive and Exotic Species of North America http://www.invasive.org Close Menu

Garbelotto and Rizzo Labs U.C. Berkeley U.C. Davis Close Menu

What is Sudden Oak Death?

Sudden Oak Death Pathogen

Symptoms on Trees

(Source)

(Source)

(Source)

• Brown to Black Cankers on lower trunk
• Occasional cankers on higher branches
• Oozing dark red to black sap
• Cankers on some species may not bleed
• Healthy appearing crown in the early stages
• Later stages: thinning or complete browning of crown

(Source)

(Source)

• Browning of leaves may occur over a period of weeks
• Beetles and Hypoxylon fungus often move opportunistically into SOD weakened trees
• Twig dieback on some species
• Spontaneous drooping of new growth on some species (tanoak)
• When the outer bark is removed, a dark zone line is evident delimiting healthy tissue from necrotic tissue

 

Symptoms on Foliar (non-oak) Hosts

(Source)

(Source)

(Source)

• Leaf spots
• Twig dieback
• SOD on foliar hosts can only be identified by laboratory analysis
  

What is Sudden Oak Death?

Sudden Oak Death Pathogen