bur oak blight in minnesota
DESCRIPTION
Bur Oak Blight in MinnesotaTRANSCRIPT
Bur Oak Blight in
Minnesota
Tree Care Advisor Core Course Training 2012
You’ve Prepared Your Community
for…
Dutch Elm Disease
You’ve Prepared Your Community
for…
Oak Wilt
You’ve Prepared Your Community For
Emerald Ash Borer
But…What About BOB?
Prepare Your Community for
Bur Oak Blight = BOB
Bur Oak Blight…the details
Fungal Foliar Disease (Leaf Spot)
Tubakia species
Bur Oak Specific
1. What Does it Look Like?
Note “wedge-shaped”
symptomology
2. Is It In Minnesota?
Yes
Confirmed in Hennepin, Mille Lacs and
Sherburne Counties
3. What Trees Are Affected?
Only Bur Oak…to date
4. How Does It Spread?
4. How Does It Spread?
Spores from infected leaf blades and petioles
Spring infection
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
6. Can Anything Be Done?
Baby Steps
Maintain Health: Water Management, Mulch
Chemical Injections: Propiconazole
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