DIAGNOSIS TABLE-DOUGLAS FIR, OAK AND PINE

DIAGNOSIS TABLES FOR DOUGLAS-FIR, OAK, PINE

Note: These tables list commonly encountered signs and symptoms and likely causes, but not every possible symptom or potential cause is noted.

Douglas-fir diagnosis table

Description	Possible causes (not exhaustive)
Tree foliage is sparse, thinning Tree foliage is turning light green, yellow, orange, or red	Abiotic factors/drought Flatheaded fir borer Douglas-fir insect pests Root diseases: armillaria, blackstain, laminated root rot Overwatering/summer irrigation
Whole tree appears to be dying	Abiotic factors/drought Flatheaded fir borer Douglas-fir insect pests Root disease: armillaria, blackstain, laminated root rot Overwatering/summer irrigation
Top of tree is dying or dead	Douglas-fir insect pests Phomopsis canker
Branches are dying Scattered branches are turning red	Flatheaded fir borer Douglas-fir insect pests Phomposis canker
Woodpeckers are feeding on trunk; tree is losing bark	Flatheaded fir borer Abiotic factors/drought Root disease: armillaria, blackstain, laminated root rot
Foliage is thinning Interior needles are being shed, cast Branch tips are still green	Needle casts

Oak diagnosis table

Description	Possible causes (not exhaustive)
Leaves are undersized and/or discolored and /or prematurely dropping	Root disease Overwatering/summer irrigation Site impacts Moisture stress
Canopy/foliage appears thin, unhealthy	Root disease Overwatering/summer irrigation Site impacts Defoliators
Leaves have irregular spots or splotches Leaves may be curled and deformed	Oak anthracnose
Premature (mid to late summer, before fall) leaf drop	Moisture stress Site impacts
Some branches have died back	Root disease Overwateing/summer irrigation Galls Pit scales Site impacts
Leaves are partially or completely eaten	Defoliators
Leaves are being eaten or skeletonized Larvae are visible on leaves Larvae may hang from trees on thin, white “thread”	Defoliators

Pine diagnosis table

*Description*	Possible causes (not exhaustive)
Top of tree is dead or dying	California fivespined ips Other bark beetles Blister rust (5 needle pines)
Foliage is thinning Interior needles are being shed, cast Branch tips are still green	Needle casts/diseases
Whole tree is dead or dying	Bark beetles Root disease Abiotic factors/drought
Tree foliage is turning or has turned from green to greenish yellow	Bark beetles Root disease
Woodpeckers are feeding on trunk; bark is falling off	Bark Beetles
Pitch tubes are visible on trunk	Bark beetles Sequoia pitch moth
Some branch tips are dead	Pine tip blight W estern gall rust Blister rust

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