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Lilac > Leaves > Leaves brown to black and wilted

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Credit: M. Grabowski, Univeristy of Minnesota
Credit: M. Grabowski, Univeristy of Minnesota
Credit: M. Grabowski, Univeristy of Minnesota
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Bacterial Blight
Pseudomonas syringae pv. syringae

Dark brown leaf spots with yellow halos, center of spot may crack and fall out
Leaves on the end of the branch turn completely brown to black
Flower buds are limp and black
Infected buds are black and will not open
Common with cool wet spring weather
More information on Bacterial Blight...

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Credit: J. Beckerman, University of Minnesota
Credit: J. Beckerman, University of Minnesota
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Ascochyta Blight
Ascochyta syringae

Current year's shoots and flower stalks are wilted, brown and often form shepherd's crook
The stem of infected shoots is tan, shrunken and peppered with gray to pale orange spore producing structures
Water soaked, olive colored blotches appear on leaves in late summer; coalesce until entire leaf is brown
Leaf blotches may grow together until entire leaf is brown
More information on Ascochyta Blight...

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Credit: M. Grabowski, University of Minnesota
Credit: W. Jacobi., Colorado State University, Bugwood.org
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Verticillium wilt
Verticillium dahlia

Leaves on one to several branches turn red to yellow, wilt, die and fall off
Dark olive to gray streaks are often visible in the sapwood if the bark is peeled back
The entire canopy may show symptoms in a single season or take several years
Symptoms are often most obvious in late summer and autumn but can occur throughout the growing season
More information on Verticillium wilt...

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