GSOB Survey

Tree Health Survey

Tree Surveyed
Healthy, unaffected
Injured, affected
Recently dead (< 1 yr)
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GSOB Home Identification Guide

Infestation Density Map

Location

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Injury

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Oak SpeciesSize Crown Rating
Leaves Stem/Branches Cause of InjurySave
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Healthy

Oak Species Size

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Oak Species

Size

Oak Species

Size

Crown Rating

Leaves

Leaf Feeding
Skeletonization
Discoloration/mildew
Leaf rolling/tiering
Leaf/twig galls
Oak Mistletoe

Stem/branches

Bark staining
Solidified
Red oozing, bleeding
Dark-colored and wet
Staining from a wound
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Fungus

Decay fungus conk


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Holes

Insect emergence holes on bark

circle

oval

D-shaped


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Canker fungi

Canker fungi

Sloughing bark
Carbon balls


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Caterpillar cocoons

Caterpillar cocoons


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Woodpecker

Woodpecker foraging


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Dust

Insect boring dust on outer bark

Fine white powder
Reddish and granular


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Insect larval galleries

Insect larval galleries

Only observe galleries if the wood is exposed or bark is flaking off. Do not injure tree to observe symptoms.

Irregular pattern on wood
Straight horizontal lines on wood
Irregular galleries in outer bark


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Insect frass

Insect frass

Only observe frass if the wood is exposed or bark is flaking off. Do not injure tree to observe symptoms.

Granular and tightly-packed
Fibrous and loosely-packed
Pellet-like in outer bark


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Cause of Injury

Suspected cause of injury

Insect
Disease
Other

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Town

Ownership

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Coast live Oak

Coast live oak is very common in urban landscapes in southern California. This is an evergreen oak species with a broad crown and smooth bark that is common in urban and for-est settings. Leaves are leathery and cupped or flat shaped with margins spiny or round. Leaves are oval, oblong, or elliptically shaped and glossy green above. The underside of the leaf may be fuzzy or only possess hairs at vein crotches. Acorns are sharply pointed and elongated.

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California Black Oak

California black oak is a deciduous tree found at higher elevations (4,000-8,000 ft). The leaves are bright green and deeply lobed with spines on the tips. The bark is dark in color and ridged in older trees. Acorn cups are deeply cup-shaped with thin, paper-like scales. California black oak is prevalent throughout the mountains in southern California.

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Engelmann Oak

This is a semi-deciduous tree species with a rounded crown. The bark is grayish and scaly. Leaves are a pale-green color, leathery, and flat. Leaves are rounded at the tip and mostly entire. Acorns have a rounded tip and the cups enclose nearly half of the seed. This species has a limited distribution in lower elevation oak woodlands in San Diego, Riverside, and Los Angeles Counties.

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Valley Oak

Valley oak is a deciduous tree with thick, furrowed bark. Leaves are deeply lobed with 6-10 rounded lobes. The upper surface is a shiny dark green and paler green underneath possessing short, dense hairs. Acorns are long, conical with warty scales on the cup. Common in the Santa Monica Mountains and northwest of Los Angeles. Valley oak is found primarily in the Santa Monica Hills region and along Interstate 5, north of Los Angeles.

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Canyon live Oak

This is an evergreen tree that is found in the higher elevation forests (4,000-8,000 ft) and commonly has multiple stems. Leaves are leathery, typically flat, and wedge-shaped with spiny or smooth margins. New leaves have fine red hairs on the underside of the leaf, whereas older leaves possess a gray color on the underside. Acorns have a wide, bulbous cap.

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Interior live Oak

Interior live oak is found in forested areas throughout southern California. Interior live oak is an evergreen oak that can be tree or shrub form. Leaves are leathery, shiny, flat, and lack hairs on both surfaces. Stiff spines are found along the leaf margins. Bark is furrowed and gray when mature. Acorns possess a tapering tip and sit in a deep cup with thin and flat scales.

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Blue Oak

Blue oak is a deciduous tree with a rounded crown. The bark is light gray in color and shallowly check-ered. Leaves are dull green possessing few shallow lobes or entire margins. Acorns are oval-shaped, have a sharply pointed tip, and shallow, warty cups. Blue oak is found in northern Los Angeles and Kern county in southern California.

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Holly Oak

This is an evergreen tree species that is a common ornamental found throughout southern California. Bark is gray with checkered, scaly plates. Leaves are shiny dark green on the upper surface and pale green on the underside. Leaves can possess smooth margins or spiny margins. Acorns can be found on stalks with pointed tips and a deep cup.

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Cork Oak

Cork oak is a common ornamental tree species found in southern California. It is an evergreen tree with leaves that are shiny green on the upper surface and light green below. Leaf margins are mostly spiny. Bark is thick, furrowed, and very “corky.” Outer bark can be easily chipped away. Acorns have a dim-pled tip and the cup covers half the seed.

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Scrub and Other Oak

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