Disease Symptoms

Sudden Oak Death: The Facts As We Know Them

Recently, an unknown species of Phytophthora fungus was discovered as an underlying cause of Sudden Oak Death. A tree may be infected with Phytophthora for a number of months or years before exhibiting a sudden change in foliageā€¦
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Why Are All The Leaves On My Modesto Ash Falling Off The Tree?

One possible reason is that a fungus called anthracnose is infecting the leaves.

Various species of anthracnose (Apiognomonia, Discula, Gleosporium, Glomerella, and Gnomonia) cause partial to total defoliation of trees in late spring or early summer. When symptoms are severe, we do not recommend treatment. Resistant plant material, good sanitation practice, fertilization to stimulate vigor and fungicide applications may provide some control but will not eradicate an existing infection. Moist weather in April and May increases susceptibility to this pathogen.

Symptoms & Solutions

We want to thank everyone who came to do our job. They were so nice and so good! We are really pleased with the job. Ernie, Los Altos Hills

TCIA Accredited Certified Treecare Safety Professional Quality - Integrity - Confidence ISA Board-Certified Master Arborist International Society of Arboriculture