Linden, American
Symptom Cause  
Irregular tan or brown spots on leaves at veins; expand until leaves die; sometimes sunken spots on leaves
Anthracnose (on plants)
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Leaves curled; distorted
Aphids
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Tip of leaves brown, internal larvae trails visible. Severe infestation leaves drop.
Basswood Leafminer
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Many holes in branches; limbs girdled sawdust at holes
Borers
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Reddish-brown spots on bark
Canker Stain (fungus)
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Young portions of foliage disappear, or young tips disappear, bark peeled off
Deer
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Holes in leaves
Japanese Beetles
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Leaves consumed; visible yellow egg masses
Larvae of Gypsy Moth
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Circular brown spots on leaves
Leaf Blight (bacterial)
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Brown spots along veins
Leaf Spot
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Leaves have ragged holes
Linden Leaf Beetle
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Leaves stippled, yellowing or bronze; dry out and drop may be webbing visible; sometimes galls form on leaves
Mite
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Poor spring foliage/ eatrly leaf drop
Poor Soil Conditions
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White coating on leaves
Powdery Mildew
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Bark of trunk and roots gnawed
Rodent Injury
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Stunted growth; bumps on leaves and branches
Scale
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Black powdery sooty mold fungus forms on honeydew; branches may die
Sooty Mold
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