Trunk Wrap  - Trunk wrap on young trees prevents the green cortex from photosynthesizing.  There are no data to show that trunk wraps prevent "frost" cracks or “sun” scald. 

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See "Tree Wrap"

See "Cortex".

Diagram to left is for wrapping young trees.  Some mature trees such as London Planes or Sycamores have a green cortex enveloping most of the trunk as the outer phellem is shed.  See "cortex".

See TREE PITHY POINTS, SHIGO, 1999 pg 151

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