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"
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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