Soilborne Diseases—Harvest

On this page
  • Lettuce drop
  • Lettuce dieback
  • Corky root
  • Verticillium wilt

Names link to more information on identification and management.

Click on photos to enlarge
Lettuce drop causes the older leaves to wilt.
Lettuce drop
Identification tip: Older leaves wilt; eventually the entire plant wilts and collapses, making it unharvestable.
Lettuce dieback
Lettuce dieback
Identification tip: Outermost leaves are extensively yellowed. The younger, inner leaves often remain dark green in color, but can be rough and leathery in texture.
Corky root
Corky root damage
Identification tip: Roots show reduced feeder roots and a rough, pitted taproot.

Verticillium wilt
Verticillium wilt
Identification tip: Verticilium causes the area between veins to yellow and turn brown.

Top of page

Statewide IPM Program, Agriculture and Natural Resources, University of California
All contents copyright © 2017 The Regents of the University of California. All rights reserved.

For noncommercial purposes only, any Web site may link directly to this page. FOR ALL OTHER USES or more information, read Legal Notices. Unfortunately, we cannot provide individual solutions to specific pest problems. See our Home page, or in the U.S., contact your local Cooperative Extension office for assistance.

Agriculture and Natural Resources, University of California

Accessibility   /PMG/C441/m441hpsoilpests.html revised: June 19, 2017. Contact webmaster.