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Sudden Oak Death

Preventative Care to Avoid Disease

Our California Oaks are Marin County’s premium native tree. Although they are sturdy trees in their natural environment they will need care and consideration in the landscape. QUERCUS AGRIFOLIA or Live Oak is a dense, heavily foliated tree. Care for your oaks needs to be done in spring or fall, not in the rainy, muddy season. Thinning and trimming to remove dead or diseased limbs or heavy branch end weight should be the objective. Care should be taken to avoid exposing branch bark to scorching summer sun because the tops of branches can become sunburned. This kind of damage is not visible from the ground below. Quercus Agrifolia should be cared for by experienced knowledgeable arborist.

Often a grove of oaks is overcrowded or dark. Bring light into darkened canopies to enhance photosynthesis. Accomplish this by removing competing vegetation, especially bays — and even other crowding oaks to make a sturdy stand of balanced trees.

Root Care

Drainage and irrigation are major concerns, since over-watering is the most common cause of oak root fungus.

Common Diseases

Sudden Oak Death (Phtophthora ramorum) —below is a link for latest resource on this disease, which is devastating Tan oak, coast live oak and California black oak, please check out:

Armillaria mellea — commonly known as oak root fungus is a common native soil-born fungus that becomes parasitic and lethal under certain circumstances. Stresses, including warm-season irrigation, are frequently the cause.

Recommended Reading

Oak Tree Care (pdf) — from

If you are in need of oak care, Swift Tree Care tree service is here for you. Contact us today!