HEAVY PITCH FLOW IN DOUGLAS -FIR - Ask Extension
I HAVE A 75 YEAR OLD D-FIR IN MY BACK YARD THAT HAS A VERY HEAVY SAP FLOW FROM TWO SIDE OF THE TREE. THIS TREE IS ONE OF SEVERAL ALL GROWING IN CLOSE ...
Knowledgebase
HEAVY PITCH FLOW IN DOUGLAS -FIR #424556
Asked August 31, 2017, 6:27 PM EDT
I HAVE A 75 YEAR OLD D-FIR IN MY BACK YARD THAT HAS A VERY HEAVY SAP FLOW FROM TWO SIDE OF THE TREE. THIS TREE IS ONE OF SEVERAL ALL GROWING IN CLOSE PROXIMITY. ALL OF THE TREES APPEAR TO HAVE HEATHY CROWNS. THIS PITCH FLOW BEGAN THIS YEAR. THERE IS NO APPARENT SOURCE FOR THE FLOW, NO SCAR OR OTHER INJURY. ANY IDEAS AND DOES THIS SUGGEST THAT THIS TREE HAS A DISEASE
Clackamas County Oregon
Expert Response
Heavy pitch flow, also called "resinosus", can result from a variety of causes including root disease, old scars and stem breakage that is healed over, and foreign objects that have been overgrown by the wood. Root diseases are perhaps of greatest concern.
In the case of root diseases, resinosus is usually found at the base of the tree. Some decline in the tree crown often becomes apparent with advanced cases of root disease. It is a good sign that your tree crowns appear to be healthy, although trees can have root disease for many years before symptoms show in the crown.
Diagnosis of the cause in your case would require further investigation looking for specific signs of disease on the roots. The two most likely root diseases that would cause resinosus in our area are Armillaria and Phellinus.
https://www.fs.usda.gov/Internet/FSE_DOCUMENTS/stelprdb5186649.pdf
Please contact me directly for further assistance.
In the case of root diseases, resinosus is usually found at the base of the tree. Some decline in the tree crown often becomes apparent with advanced cases of root disease. It is a good sign that your tree crowns appear to be healthy, although trees can have root disease for many years before symptoms show in the crown.
Diagnosis of the cause in your case would require further investigation looking for specific signs of disease on the roots. The two most likely root diseases that would cause resinosus in our area are Armillaria and Phellinus.
https://www.fs.usda.gov/Internet/FSE_DOCUMENTS/stelprdb5186649.pdf
Please contact me directly for further assistance.
