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8a Pruning Mature Shade Trees
 

8a Pruning Mature Shade Trees

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    8a Pruning Mature Shade Trees 8a Pruning Mature Shade Trees Presentation Transcript

    • Colorado Master Gardener Training Pruning Mature Shade Trees
    • Prune mature trees with a purpose in mind.
      • Crown cleaning
      • Crown thinning
      • Crown raising
      • Crown reduction
      • Hazard reduction
      • Vista clearance
      A good pruning job will not be highly noticeable!
    • Prune mature trees with a purpose in mind.
      • Crown Cleaning
    •  
    • Prune mature trees with a purpose in mind.
      • Crown Cleaning
        • Removed dead, diseased, and broken branches
    • Why dead branches should be removed:
        • Hazard issues
        • Source of disease organisms or insects
          • Fireblight
          • Cytospora
          • Borers
    • When removing dead branches, do NOT cut into callus tissue.
    • Prune mature trees with a purpose in mind .
      • Crown Thinning
    • Prune mature trees with a purpose in mind .
      • Crown Thinning
        • Use natural target pruning cuts (thinning cuts)
        • Focus on branches <2” diameter
    • Prune mature trees with a purpose in mind .
      • Crown Thinning
        • Use natural target pruning cuts (thinning cuts)
        • Focus on branches <2” diameter
      A good pruning job will not be highly noticeable!
    • Prune mature trees with a purpose in mind.
      • Crown Raising
    • Prune mature trees with a purpose in mind.
      • Crown Raising
      • Use natural target pruning cuts , pruning to more upright LARGER laterals or remove branch entirely.
      • Avoid reduction cuts to smaller laterals.
      • 1/2 foliage in bottom 2/3s of tree
    • Prune large trees with a purpose in mind.
      • Crown Reduction
    • Prune large trees with a purpose in mind.
      • Crown Reduction
      • Requires reduction cuts
        • Doesn’t protect the branch defense zone
        • Predisposes branch/trunk to internal decay
      • Avoid crown reduction on trees in stress or decline
    • Prune large trees with a purpose in mind.
      • Crown Reduction
      • Begin pruning as tree starts to reach acceptable size, rather than when overgrown.
      • Remove <1/4 of crown-foliage/year
    • Don’t top trees. Topped trees become structurally unsound for life! Branch tissue when it grows with trunk/parent branch Branch tissue from epicormic growth
    •  
    •  
    • Epicormic shoot
    • Topping > Auxin removal
    • Topping >> the “Don King” look?
    • Prune large trees with a purpose in mind.
      • Hazard Reduction
    • Prune large trees with a purpose in mind.
      • Hazard Reduction
      • Crown cleaning
      • Crown thinning
        • Reduce weight on hazardous limbs
    • Pruning storm damaged trees
    • Pruning storm damaged trees
      • Keep when scaffold branches and trunk have sound wood or can be pruned to sound wood.
      • May accept less than ideal pruning by “mother nature”
    • Pruning storm damaged trees
      • Keep in mind
        • Natural target pruning
        • Structural integrity
      • Heavy pruning required?
        • Select less vigorous shoots
        • May require work over 2-4 years
          • < 1/4 of foliage removed per year
    • Pruning old trees with declining vigor
    • Pruning old trees with declining vigor
      • Focus on
        • Weak and failing branches
        • Lowering crown over time
        • Do NOT “top”
    • Pruning root damaged trees
    • Pruning root damaged trees
      • Prune dead and weak branches
        • Carbohydrate reserves in wood help maintain tree’s vigor
        • Allow natural selection of weak branches
      Does the tree need crown cleaning or crown thinning?
    • Utility rights-of-way take priority over a tree’s appearance and health.
    • Utility rights-of-way take priority over a tree’s appearance and health.
      • $1 billion / year
      • General arborist
        • 10 feet from 50,000 volt line
      • Line clearance training
        • 15 feet from 552,000 volt line
        • 2 feet from 15,000 volt line
    •  
    • Aspen
    • Crabapple
    •  
    •  
    • How should you prune a mature tree?
    • A tree’s structural integrity is set for life by the training it receives while young.
    • U-prune with laser pointer
    • How did you do?
    •