Presentation on theme: "Strengthening our Community Tree Canopy Through Education Module #3: Pruning Young Trees in the Urban Landscape Laura Sanagorski, Environmental Horticulture."— Presentation transcript:
Strengthening our Community Tree Canopy Through Education Module #3: Pruning Young Trees in the Urban Landscape Laura Sanagorski, Environmental Horticulture Extension Faculty
Strengthening Our Community Tree Canopy 2012 Urban Forestry Series This series is a part of a project titled “Strengthening Our Community Tree Canopy Through Education”. This project is made possible by a grant through the 2011 National Urban and Community Forestry Grant Program and the Florida Department of Agriculture and Consumer Services, and the Florida Forest Service.
Straight, single leader Evenly spaced branches and full, even canopy Free of pests, disease, and injury Roots grow away from the trunk; do not circle or girdle STRUCTURALLY SOUND TREES Photo: UF Laura Sanagorski
Every pruning cut: Creates potential entry points for decay organisms Promotes shoot elongation Reduces photosynthesis Causes consumption of stored carbohydrates EFFECTS OF PRUNING Photo: UF Laura Sanagorski
Improper pruning cuts: Cause the above negative impacts, plus May create or enhance structural defects May increase insect and disease problems May increase maintenance needs Could reduce tree longevity Could injure or kill you EFFECTS OF PRUNING Photo: UF Laura Sanagorski
CODIT: Compartmentalization of decay in trees Compartmentalization ~ trees don’t heal Xylem cells form 6-sided compartment with four walls Wall (s) 1 : plugging of xylem vessels above and below wound Wall 2: Thick cell growth on ring Wall(s) 3: Cell growth on radial xylem rays Wall 4: New xylem formation EFFECTS OF PRUNING - CODIT Photo: UF Laura Sanagorski
Compartmentalization Of Decay In Trees (CODIT) – Wall (s) 1 : plugging of xylem vessels above and below wound – Wall 2: Thick cell growth on ring – Wall(s) 3: Cell growth on radial xylem rays – Wall 4: New xylem formation USDA Forest Service - Northeastern Area Archive, USDA Forest Service, Bugwood.org
The tree will either: Seal off the wounded area, preventing the decay from spreading to the healthy, uninjured parts of the tree, allowing the tree to survive Not seal off the wounded area, allowing the decay to spread throughout the tree. Trees with excessive decay are prone to branch failure and may have shortened life spans TREES DO NOT HEAL Photo: UF Laura Sanagorski
Remove dead and diseased branches Maintain proper structure and tree health Central Leader Strong Branch Connections Balanced Canopy Keep Branches < ½ Trunk Diameter Improve and maintain tree appearance Provide clearance beneath tree Reduce weight of stressed limbs Increase safety of landscape environment PRUNING OBJECTIVES Photo: UF Laura Sanagorski
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