What is wrong with cedar tree

Asked June 19, 2020, 10:09 PM EDT

our giant cedar tree looks like it is dying and has whitish yellow tips and large sections of brown branches. Ive tried fungicide and insecticide and it isn't helping. Any ideas?

Okaloosa County Florida

1 Response

Good morning,
The best that I can tell from the photos is that the symptoms look like a vascular disease such as Seiridium Canker and/or Botryosphaeria Canker. With these types of fungal diseases there is no chemical control. The best that you can do is to do some strategic pruning. That is, prune out the dead and dying branches and limbs that are infected. Here is some information from an Extension publication, “Seiridium canker, caused by the fungus Seiridium unicorne, occurs on Oriental arborvitae, bald-cypress, Arizona, Italian and Leyland cypresses, and occasionally junipers. Symptoms of the disease are similar to Botryosphaeria canker. Elongated, flattened cankers form on small branches and main stems. Bleeding or resin formation in cankers is common. Multiple coalescing branch and stem cankers may cause branch dieback, or in some cases, tree death.”

I can’t be positive by just looking at the photos but the symptoms look like a vascular disease as described above. Give me a call or email if you would like to discuss further. Larry


Larry Williams
Residential Horticulture Agent
Okaloosa County Extension
University of Florida/IFAS
3098 Airport Road, Crestview, FL 32539
850-689-5850 lwilliams@myokaloosa.com