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Latest Tree Research From the Experts
Dr. Tom Smiley from Bartlett Tree Research in NC entertained a
large group of Arizona professional tree care specialists on Friday, January 17,
2003. The meeting was put on by the Arizona Community Tree Council, Inc. and
held at the Cooperative Extension Service in Phoenix.
Latest Research on Tree Structural Integrity
- Terravent to lift then resettle compacted soil (little benefit
noted)
- Lightning Protection (1/4" wire, 35' spacing, drive fasteners 3-6')
- Cabling & Bracing (above the crotch)
- Proper Guying Stakes (straight is best)
- Deep Root Planters- Do they help? (yes)
- Ground & Tree Penetrating Radar (to locate roots and hollows)
- How Close Can Roots Be Cut? (3X DBH)
- Strongest Angle of Branch Attachment (wider is better)
Latest Research on Tree Pests
- Asian Longhorn Beetle
- Is Aleppo Pine Blight really caused by Diplodia fungus (jury
is out)
- Citrus phytopthora canker results (too much water, deep planting)
- Acacia rust is a witch's broom (caused by Revenelia pringlei)
- Acacia whitefly (use sticky traps)
- Lacebug on oak's in summer (delay fertilizer)
- Flathead borers attack stressed trees
- Lerp psyllid damage of Eucalyptus (in CA but not AZ...yet)
Latest Research on Tree Nutrition
- High tree fertilization prevents borers and
caterpillars
- High tree fertilization promotes aphids,
scales & whitefly
- The effectiveness of mycorrhizal inoculations is mixed on
young vs. old established trees - old trees respond better
- Humic acid may kill mycorrhizal inoculants, so be careful
- Volcano mulching with wood ships is very detrimental to transplanted
trees
- Does fertilization at transplantation help? - Yes!
- Prescription fertilization, based on first doing soil and tissue
testing is beneficial to tree health
- Cambistat growth regulator results in very attractive trees that resist
stress
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