Bur Oak Blight in Minnesota
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Transcript of Bur Oak Blight in Minnesota
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Bur Oak Blight in
Minnesota
Tree Care Advisor Core Course Training 2012
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You’ve Prepared Your Community
for…
Dutch Elm Disease
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You’ve Prepared Your Community
for…
Oak Wilt
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You’ve Prepared Your Community For
Emerald Ash Borer
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But…What About BOB?
Prepare Your Community for
Bur Oak Blight = BOB
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Bur Oak Blight…the details
Fungal Foliar Disease (Leaf Spot)
Tubakia species
Bur Oak Specific
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1. What Does it Look Like?
Note “wedge-shaped”
symptomology
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2. Is It In Minnesota?
Yes
Confirmed in Hennepin, Mille Lacs and
Sherburne Counties
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3. What Trees Are Affected?
Only Bur Oak…to date
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4. How Does It Spread?
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4. How Does It Spread?
Spores from infected leaf blades and petioles
Spring infection
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5. Recognizable Symptoms?
Summer (July >) leaf spotting and blotching
Leaves turn brown/gray
Worse at bottom of crown and interior
Many leaves retained through winter
Worsens each year
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6. Can Anything Be Done?
Baby Steps
Maintain Health: Water Management, Mulch
Chemical Injections: Propiconazole
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7. For More Help and Information…
For BOB testing:
•Collect branch tips with symptomatic and healthy
leaves from several locations on the tree;
•Wrap them in dry paper toweling (no plastic bags,
please), and send them to:
Plant Disease Clinic
Department of Plant Pathology
495 Borlaug Hall
1991 Buford Circle
St. Paul, MN 55108