Branch Protection Zones  - Protection zones form within the bases of branches. The zones are made up of chemicals that come from stored energy reserves - starch, oil- in living wood cells. The zones resist spread of organisms from the branch into the trunk. The chemicals are phenol-based in hardwoods and terpene-based in conifers.  More on the topic.

 

 

 

 

 

 

 

 

 


 


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