Skip to Main navigation Skip to Left navigation Skip to Main content Skip to Footer

University of Minnesota Extension
www.extension.umn.edu
612-624-1222

Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous > Lilac > Leaves brown to black and wilted

Print Icon Email Icon Share Icon

Lilac > Leaves > Leaves brown to black and wilted

1 of 3
  • bacterialblight1
  • bacterialblight2
  • bacterialblight3
  • - CLICK PHOTOS TO ENLARGE -

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...
2 of 3
  • ascochytablight1
  • ascochytablight2
  • - CLICK PHOTOS TO ENLARGE -

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...
3 of 3
  • verticilliumwilt1
  • verticilliumwilt2
  • - CLICK PHOTOS TO ENLARGE -

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...

Don't see what you're looking for?

  • © Regents of the University of Minnesota. All rights reserved.
  • The University of Minnesota is an equal opportunity educator and employer. Privacy