Ash, White
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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Limbs die; large holes appear; starting at top of tree
Asian Longhorn Beetle
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Many holes in branches; smaller limbs girdled sawdust at holes
Borers
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Holes in foliage
Box Elder
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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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Foliage turns pale or mottled
Lacebugs
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Leaves consumed; tawny egg masses visible on trunk
Larvae of Gypsy Moth
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Tipi of leaves brown, internal larvae trails visible. leaves can be distorted. Premature drop of leaves.
Leaf Miners
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Leave stippled, yellowing or bronze; dry out and drop may be webbing visible; sometimes galls form on leaves
Mite
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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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Rust colored spots on leaves
Rust (on plants)
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Small bumps on leaves and branches; growth of tree may be stunted
Scale Insects
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Leaves notched
Weevils
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New shoots branch from side budes
Witches' Broom (fungus)
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