Monday, February 10, 2014

Top 10 Problematic Trees of Illinois in 2013

Based on Plant Clinic sample submissions and questions, the following trees were considered to be the most problematic in 2013:



*The chart above does not include nematode sample data







(Links below provide further information on disease, insect, as well as abiotic threats discovered on each tree in 2013.)


#10. Crabapple
 Cedar apple rust:  http://hyg.ipm.illinois.edu/article.php?id=482
 Apple scab:  http://urbanext.illinois.edu/focus/applescab.cfm

#9.  Juniper
 Phytophthora Alert:  http://universityofillinoisplantclinic.blogspot.com/2013/06/phytophthora-root-and-crown-rot-alert.html

#8.   Arborvitae (Cedar)
Phytophthora Alert:  http://universityofillinoisplantclinic.blogspot.com/2013/06/phytophthora-root-and-crown-rot-alert.html

Browning of Evergreens:  http://www1.agric.gov.ab.ca/$department/deptdocs.nsf/all/agdex4144
Conifer Dieback:  http://www.ppdl.purdue.edu/ppdl/pubs/briefs/conifer-dieback.pdf

#7.  Ash (excluding Emerald Ash Borer issues)
EAB:   http://hyg.ipm.illinois.edu/article.php?id=464
Ash Anthracnose:   http://hyg.ipm.illinois.edu/article.php?id=470

#6.  Ornamental Pear
Pear blights:  http://hyg.ipm.illinois.edu/article.php?id=490

#5.  Elm 
Verticillium wilt:  http://hyg.ipm.illinois.edu/article.php?id=518

#4. Pine
Eastern White pine + Drought = Problems
http://universityofillinoisplantclinic.blogspot.com/2013/03/eastern-white-pinte-drought-problems.html

#3.  Maple
Maple leaf blights:  http://hyg.ipm.illinois.edu/article.php?id=473
Taphrina diseases:  http://hyg.ipm.illinois.edu/article.php?id=478
Maple early fall color:  http://www.dnr.state.mn.us/fid/august97/08259704.html

#2.  Spruce
U of I Plant Clinic Report on Spruce Problems:  http://web.extension.illinois.edu/plantclinic/downloads/Plant%20Clinic%20Report%20Spruce.pdf

and the number one problematic tree of 2013:

#1.  Oak
Taphrina diseases:  http://hyg.ipm.illinois.edu/article.php?id=478
Oak wilt:  http://hyg.ipm.illinois.edu/article.php?id=506
Bacterial leaf scorch (BLS):  http://hyg.ipm.illinois.edu/article.php?id=513
Bur Oak Blight (BOB):  http://hyg.ipm.illinois.edu/article.php?id=537
NEW U of I Plant Clinic Report on Oak Problems:  http://web.extension.illinois.edu/plantclinic/downloads/Plant%20Clinic%20Report%20Oak%20LO.pdf

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