Larch, American
Symptom Cause  
Needles curled and distorted
Aphids
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Branches and stems girdled; resin visible
Canker Stain (fungus)
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Young portions of foliage disappear, or young tips disappear, bark peeled off
Deer
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Needles chewed
Japanese Beetles
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Leaves browned in spring
Larch Casebearer
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Needles notched; stripped
Larch Sawfly
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Needles consumed; visible tawny egg masses
Larvae of Gypsy Moth
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Needles turn yellow; then brown
Leaf Cast (fungus)
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Needles yellowed; undersides show fungus
Rust (on plants)
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Black powdery sooty mold fungus on honeydew; branches may die
Sooty Mold
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Larch fails to thrive
Too Much Shade
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