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CUES: Center for Urban Ecology and Sustainability

Diagnosis Case: Oak

Details: A homeowner calls and mentions that they are seeing dieback on their oak. It has been ruled out that there is no sign of disease or abiotic conditions that are causing this to happen. Therefore, you suspect one of several insect problems that have been going around this year.

It is your job to make an accurate insect diagnosis for this homeowner's Oak tree so proper control methods can be followed. You must know first, what symptoms and signs to look for and secondly, what questions to ask. By selecting questions below, you will be able to note the differences between different insects that affect Oaks. Good Luck!

picture of Oak


Is there shothole damage?

Is there evidence of scale at the leaf, stem base, trunks or main branches?

Do you see sap oozing from cracks in the bark?

Do you see beetles feeding at cracks in the bark?

Do you see the presence of any other insects (besides scale)?

Click on these links to obtain more information about insects of oak!

Outside Links   Inside Links (CUES Diagnosis and Control)

Spring and Fall Cankerworms

Gypsy Moth

Flat-headed Apple Tree Borer

Kermes Oak Scale

Oak Wilt



Gypsy Moth

Flatheaded Apple Tree Borer

Kermes Scale

CUES Insects of Deciduous Trees

Back to Tree Insect Diagnosis


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Last modified on March 06, 2013