Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous Trees > Prunus > Dots, spots, or blotches on leaves
Prunus > Leaves > Dots, spots, or blotches on leaves
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Leaf curl
Taphrina wiesneri
- Leaves have thick puckered to curled spots that are yellow to reddish brown
- Diseased leaves droop, turn brown and die as the disease progresses
- Witches brooms, clusters of small twigs arising from a swollen area of the branch, form on some infected trees
- Common on wild cherry trees
- More information on Leaf curl
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Leaf spot
Blumeriella jaapii
- Leaf spots dry up and fall out, leaving holes in the leaf, leave appear to have shot holes
- Purple to reddish brown spots that are up to 1/10th inch diameter
- Spots grow together, causing large parts of the leaf to turn brown
- Leaves with multiple spots turn yellow and fall off prematurely
- Damage first seen in late spring, early summer
- More information on Leaf spot
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Bacterial spot and canker
Pseudomonas syringae pv. syringae
- Angular, brown to black leaf spots that eventually drop out leaving holes and giving a ragged appearance on leaves
- Blossoms turn brown, especially after frost damage
- Sunken dark colored elliptical cankers form on branches
- Sticky gums (gummosis) or sour-smelling liquid are excreted from infected branches
- More information on Bacterial spot and canker
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Lace bug
Corythucha spp.
- White or yellow speckled or pinprick discolorations on upper
leaf surfaces - Lace bugs are up to 1/4 inch long; light colored bodies with dark colored spots; intricate, lacy wings
- More information on Lace bugs
