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Lilac > Leaves > Leaves discolored yellow

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Credit: M. Grabowski, University of Minnesota
Credit: M. Grabowski, University of Minnesota
Credit: M. Grabowski, University of Minnesota
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Witches' Broom
Candidatus Phytoplasma fraxini

Dense clusters of short, thin twigs originate from one area of stem
Leaves may be small, distorted and yellow
Brooms are common at the ends of branches and clustered at the very base of the plant
Entire canopy is pale green to yellow, some leaves with brown margins
Branches may die and shrub will decline
More information on Witches' Broom...

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Credit: W. Seidel, University of Minnesota
Credit: W. Seidel, University of Minnesota
Credit: USDA Forest Servcie Region 2, Rocky Mountain Region, Bugwood.org
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Oystershell scale
Lepidosaphes ulmi

Light infestations do not exhibit obvious symptoms
Severe infestations can cause chlorotic, stunted foliage
Dieback and cracked bark can result from heavy infestations
Light to dark brown, elongated, 1/10 to 1/8 inch long oyster-shell shaped scales found on bark.
More information on Oystershell scale...

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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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