UC IPM Online UC ANR home page UC IPM home page


SKIP navigation



Common Trunk and Root Diseases and Symptoms

On this page
  • Armillaria root rot
  • Avocado root rot
  • Bacterial canker
  • Black streak
  • Dothiorella canker
  • Phytophthora canker and collar rot
  • Sunblotch

Names link to more information on identification and management.

Click on photos to enlarge

Armillaria root rot
Armillaria root rot
Identification tip: Commonly causes unhealthy looking foliage, leaf drop, dieback of upper limbs, and mushrooms growing near trunks.

Avocado root rot
Avocado root rot
Identification tip: Symptoms include unusually abundant small fruit, a sparse canopy of drooping older leaves, and new shoots of small pale leaves.
Bacterial canker
Bacterial canker
Identification tip: Typically causes liquid or pale dry ooze on bark.
Black streak
Black streak
Identification tip: Causes staining, powdery white exudate, and cankers on bark.
Dothiorella canker, Phtophthora canker, and collar rot
Dothiorella canker and Phytophthora canker and collar rot
Identification tip: Often cause very similar symptoms, including discolored or oozing bark, unhealthy foliage, and declining or dead limbs.
Cankered bark
Identification tip: Cankered bark has many causes, including abiotic disorders, pathogens, and vertebrates.

Identification tip: Symptoms include discolored indentations on fruit, rectangular bark cracking, and stunted tree growth.

Statewide IPM Program, Agriculture and Natural Resources, University of California
All contents copyright © 2014 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/C008/m008bpcomrootdis.html revised: April 25, 2014. Contact webmaster.