Barrier Zone  -  A barrier zone is a zone formed when trees are wounded.  (See A NEW TREE BIOLOGY, SHIGO, 1986 page 42) A MUST!  The reaction zone, is a chemical boundary within the wood present at the time of wounding which resist the spread of pathogens within the wood present at the time of wounding.

Click here for page 8 of SHIGO, TREE BASICS.

Click here for page 80 of SHIGO, MODERN ARBORICULTURE


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