Ohio Plant Diagnostic Workshop, September 6

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Oak wilt, Tubaki leaf spot, bacterial leaf scorch. And what about Sudden Oak Death, wasn’t that found in Ohio this year – NO; though the pathogen did arrive from a West Coast nursery on rhododendron. Beech leaf disease – what causes it and where has it been found to date?  What are its symptoms compared to beech bark disease?


Beech Leaf Disease
Banding symptoms of Beech Leaf Disease on American beech.



What’s up with these lingering ash, lingering despite emerald ash borer? What has all the early season rain wrought? Why did ‘Candymint’ crabapple have more rust this year compared to other years in northeast Ohio? What caused bark peeling on thin-barked crabapple this spring? Will these plants die?


Cedar apple rust on 'Candymint' crabapple. We have not seen this on this cultivar in decades of close insepction at Secret Arboretum
Cedar apple rust on 'Candymint' crabapple in 2019. We have not seen this disease on this cultivar in decades of close inspection.


These and much more are the questions we shall explore at our annual Ohio Plant Diagnostic Workshop on September 6 at the Secrest Arboretum at OSU-Wooster. Read on for more details.


Frost crack on 'Sentinel' crabapple
This occurred this winter and was observed this spring. How is the tree doing now?


WHO: For: All those who wish to practice the art and science of diagnosing ornamental, tree, fruit/vegetable plant problems. Instructors: The Tree Amigos: Joe Boggs, Erik Draper and Jim Chatfield, along with their tamer Curtis Young – and all of you.


WHAT:  The 86th Ohio Plant Diagnostic Workshop

Core Presentation on Host Range, Proper Pest Management Practices, and Pesticide Selection

The Season of 2019: The Usual, the Unusual, and the Bizarre

Oak Diseases

Clinic Catharis Sample Roundtables and Diagnostic Walk at Secrest

Lunch and Refreshments



Ash tree with foliage in Columbus, Ohio this year
Though ash trees in Columbus, Ohio have been ravaged by emerald ash borer, this one thrives.


WHEN: Friday, September 6, 10:00am – 4:00pm


WHERE: The Miller Pavilion and the Arboretum grounds of Ohio State University’s Secrest Arboretum on the OSU-Wooster Campus.


WHY: Because, “Diagnosis of the maladies of the plantes of the heathe and the moores is woman (and man’s) most pressing calling, penetrating the very heart of darkness of Nature gone wrong.” – Pelinor of Buckland


HOW: Register by going to go.osu.edu/chatfield (must be lower case “c”). Or you can contact Sarah Mays of OSU Extension at mays.201@osu.edu or 330-263-3831, fax: 330-263-3667.  Registration is $40 and lunch and refreshments are included.  Bring your walking shoes for the Arboretum walk. Lunch and refreshments included. Plant prizes shall be available for good questions, answers, and creative corrections and insults.  


Pawpaw with decay fungus
A lovely pawpaw at Congaree National Park this August. What is the fellow traveler?


Black oak at Secrest Arboretum in Wooster Ohio
though we will be talking about oak pests and diseases, this oak is looking good on the OSU-Wooster campus.


Also: Check out the site for the Sustainable Landscaping program at Secrest on September 3 and the Alexander von Humboldt Sestercentennial on September 13-14.