Fir, Douglas
Symptom Cause  
Leaves or needles wrinkled or curled; discolored, stunted, tend to fall off
Aphids
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One or more masses sticky cream, yellow, pinkish pitch; larva under masses
Caterpillar Pitch Moth
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Leaves chewed; tree defoliated
Caterpillars
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When young portions of foliage disappear, or young tips disappear
Deer
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New shoots fade, turn red; droop, needles drop
European Pine Shoot Borer
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Needle tips yellowed
Needle Cast (fungus)
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Orange; brown or yellow powdery masses on needles
Rust (on plants)
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Needles; branches encrusted with bumps
Scale
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Needles turn yellow
Soil Is Too Alkaine
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Black powdery sooty mold fungus forms on honeydew; branches may die
Sooty Mold
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Needles and buds eaten out; defoliation
Spruce Budworm
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Needles eaten, top of tree downward
Tussock Moths
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Twigs and roots damaged
Weevils
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