Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous Trees > Maple > Distorted or malformed leaves
Maple > Leaves > Distorted or malformed leaves
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Anthracnose
Discula campestris, D. umbrinella, Aureobasidium
apocryptum, Colletotrichum gloeosporioides
- Young leaves turn brown to black, shriveled or curled
- Mature leaves have irregularly shaped tan, brown or black leaf spots found along leaf veins; may be curled if severely infected
- Lower, interior branches are most affected
- Damage occurs in wet weather in early spring as leaves are expanding
- More information on Anthracnose
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Woolly alder aphid
Paraprociphilus tessellatus
- Insect feeding causes the leaf to fold in on itself
- White woolly masses that look like threads are produced on leaves and twigs of its host
- Excrete honeydew, a sticky, shiny material, on leaves and branches; sooty mold may also occur on honeydew
- 1/8 inch, pear shaped insect inside white woolly mass
- Silver maples are preferred hosts
- More information on Woolly alder aphid
