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Trees/leyland cypress


leyland cypress
leyland cypress  

leyland cypress
leyland cypress  
I have 8 trees,two of which started truning brown and the needles are falling off,from the bottom up. Now it looks like it is spreading to the other trees. what can I do and can they be saved?
         Thanks Mary

There are three usual diseases that will cause the foliage of Leyland's to turn. Seiridium Canker/Dieback, Botryosphaeria Dieback/Canker, and Passalora Needle Blight. Sorry most dieases of tree do not have common names.

Seiridium Canker/Dieback generally has the symptom of a bleeding canker on the effected branch. needles will fall off easily when a hand is run along the branch. Generally, the discolored branches are the symptom noticed first.

Botryosphaeria Dieback/Canker symptoms include dieback with branches turning yellow to brown in color typically the first symptom noticed. However, unlike Seiridium canker, needles generally do not fall off when running a hand down a recently affected branch. Examination of dead stems often reveals more deeply sunken (often V-shaped) cankers that do not ooz sap.

Passalora Needle Blight
Typically, this disease only affects plant growth that is at least one year old. Symptoms usually appear during summer months. They include browning of needles and eventual needle drop. These symptoms start on lower branches near the trunk and then spread outward toward branch tips. Over time, the disease moves up the tree. The portion of a tree displaying symptoms may increase from one year to the next until only the tips of upper branches are still green or the tree dies completely. The disease will sometimes be more prevalent on one side of the tree then the other. No cankers.

I say all this because it is hard to ID foliage diseases from a picture and you will need to examine the branches as above.

Here is a web link to these diseases and the treatments for each. The good news if you follow the treatments the tree can be healthy.

I hope this helps.  


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Jim Hyland


I am an expert in Forestry, Forest Entomology, Forest Pest Control, and Forest Health. Extensive knowledge in Identification of insects and diseases of trees. Expert on Bark beetles and other insects that attack forests. Also a Registrated Forester with extensive knowledge in the management and care of forests.


34 years as State Pest Management Chief in a Southern state. Extensive knowledge in Forestry.

BS with major in Forest Management and Entomology
Registered Forester
Certified Pesticide Appicator

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