Hemlock
Symptom Cause  
Foliage looks bad, silken cocoon-like bags hang on twigs
Bagworms
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Dead or dying lower branches
Cultural Conditions
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Major damage; branches and foliage eaten
Deer
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When young portions of foliage disappear, or young tips disappear
Deer
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Leaves stippled, yellow/bronze; dry out and drop, webbing visible; galls form on leaves
Mite
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Leaves and branches encrusted with small bumps; stunted plant growth
Scale
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Base of leaf and branch covered with white cottony masses. Foliage yellowing and dropping off.
Wooly Adelgid
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