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Hazard Trees Recognizing Them Before You Climb

Hazard Trees Recognizing Them Before You Climb. Diseases, Defects, and Structural Problems. Manfred Mielke, Plant Pathologist, NA FHP. Hazard Trees. Defective Tree. +. Possible Failure. =. Climber Weight. Hazard Tree Defects: The Seven Deadly Problems. Dead branches and trees Cracks

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Hazard Trees Recognizing Them Before You Climb

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  1. Hazard TreesRecognizing Them Before You Climb Diseases, Defects, and Structural Problems Manfred Mielke, Plant Pathologist, NA FHP

  2. Hazard Trees Defective Tree + Possible Failure = Climber Weight

  3. Hazard Tree Defects: The Seven Deadly Problems • Dead branches and trees • Cracks • Weak Branch Unions • Decay • Cankers • Root Problems • Poor Tree Architecture

  4. Hazard Tree Defects Dead Branches and Trees

  5. Do not climb dead trees

  6. Climb?I’m not sure I would even stand there

  7. The Classic “Widowmaker”

  8. Dead Limb lodged in Tree

  9. Hazard Tree Defects Cracks Cracks are important because they indicate that the tree is already failing!

  10. Hazard Tree Defects Weak Branch Unions Upright branching and “included bark”

  11. Maples and ashes tend to form upright branches with bad unions. Included bark is formed at the arrow

  12. Bad branch unions sometimes produce cracks in the stem.

  13. Split crotch

  14. Included Bark Leads to Cracks Which Leads to Failure

  15. Topping Results in Bad Branch Unions

  16. Cracked branch

  17. Included bark failure

  18. A good crotch…

  19. Hazard Tree Defects Cankers, Canker Rots

  20. Canker exceeds 40% of tree diameter This canker produces rolls of callus tissue.

  21. An example of a “diffuse” canker

  22. Hazard Tree Defects Decay

  23. Minimum thickness guideline A tree should always have at least 1” of sound wood radius for each 6” of diameter at any height in the tree. Trees with wounds or other defects need even more sound wood.

  24. This tree didn’t meet the guideline…

  25. Neither did these…

  26. Shell thickness?

  27. Hazard Tree Defects Root Problems Leaning trees, root rots and windthrow

  28. Root and butt rot

  29. Annosum Root Disease

  30. Restricted Rooting Zone

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