Oak, Pin
Symptom Cause  
Swollen/sunken lesions appear on stems and trunk
Bacterial Canker
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Many holes in branches; limbs girdled sawdust at holes
Borers
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Holes in leaves
Caterpillars
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Leaves yellowed between the veins; veins green
Chlorosis
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Young portions of foliage disappear, or young tips disappear, bark off
Deer
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Foliage turns pale or mottled
Lacebugs
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Leaves consumed; tawny egg masses present
Larvae of Gypsy Moth
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Leaves blistered and curled up
Leaf Blister (fungus)
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Leaves stippled, yellowing or bronze; dry out and drop may be webbing visible
Mite
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Leaves turn bronze; wilt; drop
Oak Wilt
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Leaves covered with white powder
Powdery Mildew
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Bark of trunk and roots gnawed
Rodent Injury
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Leaves skeletonized
Sawflies
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Leaves/branches encrusted with bumps
Scale Insects
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