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Conifer Pest & Disease
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When: Tuesday, June 11
8:30 AM
Where: Washington Park Arboretum, Graham Visitors Center
2300 Arboretum Dr E
Seattle, Washington 
United States

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Tuesday, June 11, 2019, 8:30am-2pm


This session will focus on insect pests and diseases that impact the health of landscape and native conifers in our region, including rusts, twig and needle blights, needle casts, scales, adelgids, bark beetles, and moths. We will examine samples in the classroom and the field. Plant Health Care (PHC) approaches to management, including acceptable Integrated Pest Management (IPM) methods will be covered. We will do diagnosis practice both in the field and lab. Bring in those samples of plant problems that have you stumped!

This series will introduce you to plant diseases and insect pests of the Pacific Northwest when they are at their peak or most easily detected. We will look at some common and familiar species as well as some new and unusual pests you need to know. Plant specimen samples will be reviewed indoors in addition to diagnosing pest problems in the field. Least toxic and most sustainable pest management methods will be emphasized. Great diagnostic resources will be discussed and utilized. Students are encouraged to bring pest and disease samples to class for discussion and diagnosis.


Lunch included in the price of registration.

Instructor Bess Bronstein is an ISA Certified Arborist, Qualified Tree Risk Assessor and horticultural consultant based on the Kitsap Peninsula in Kingston, Washington, with 30 years experience in arboriculture, landscape management and garden design. She was an instructor for the Edmonds Community College horticulture program for 28 years, with a focus on courses in pruning and tree care, plant identification, plant pests and diagnosis, and soils. Bess was an Education Coordinator for the Pacific Northwest Chapter of the International Society of Arboriculture (PNW-ISA) for 10 years, and frequently teaches public and professional arboriculture and horticulture courses throughout the Puget Sound. She is a lifetime member of Plant Amnesty, and supports ongoing education in sustainable landscape management practices and tree care.    


Cost: $125  |  Credits: CPH-5, ecoPRO-5, LA CES-5.5, WALP/NALP-5 Other credits pending



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