Insect or Disease

Treatment

Frequency

Season

Sudden Oak Death (Phytophthora) – affects Tanbark Oak, Coastal Live Oak, and Black Oak

Systemic pesticide to control SOD by triggering the defense response of tree

Initial Treatment –spray 2  times at six month intervals; annually after that

Any time

Bark Beetles (Ambrosia Bark Beetles, Red Turpentine Beetles) -  In flight from Spring through Fall

Systemic pesticide

Every 3-4 months, at least twice a year

Spray in March or April, again in July or August

All trees

Deep Root Fertilization -

Once a year

Spring and Summer

Bronze Birch Borer

Systemic Pesticide - Spray trunk in summer with Dragnet

Annual – Spray once in each of these months

Usually Jan, Feb through October

Leaf fungus and fungal soil-born diseases such as oak root rot or Sudden oak death

Systemic Fungicide – Subdue or Cleary’s 3336 WP 

Once a year

March, April

Insect infestation, white flies, aphids, twig blight, scale, moths, leaf chewers

Foliage spray- Azatrol

As needed

March, April for approx 3-4 months

Dormant Oil (Supreme) Cannot use dormant oil once tree is flowering, then will have to stop.

Coat tree –spray w/Agriculture oil. Coats winterizing eggs by 80%, sterilize tree from fungal and bacterial spores. Topical disinfectant

Usually only one treatment required in winter.

Dec., Jan , Feb.