Seminar Dates: November 12, 2025 8:00 AM
Seminar Cost: $45.00 Register Now
Seminar Description:
Understanding the difference between biotic and abiotic tree disorders is fundamental to successful tree care. This seminar will guide attendees through the complex web of tree pest issues beginning with the basics: what constitutes a disorder and how to tell whether it’s caused by a living (biotic) or non-living (abiotic) agent. Insect pests and fungal pathogens will be discussed with real-world examples and tips on accurate identification. Attendees will also learn to recognize abiotic disorders such as nutrient deficiencies and mechanical injuries. The program concludes with practical, science-based pest management strategies—highlighting early detection, cultural practices, and treatment approaches that support long-term tree vitality.
Learning Objectives:
1. Distinguish between biotic and abiotic disorders affecting trees, including the role of insects, pathogens, nutrient imbalances, and mechanical damage.
2. Identify common pest-related symptoms and causal agents, with emphasis on insect pests and fungal diseases relevant to urban and landscaped environments.
3. Implement effective integrated pest management (IPM) strategies tailored to tree health, including accurate diagnosis, cultural practices, and appropriate treatment options.
Susan Sims
Susan Sims is an ISA Board Certified Master Arborist, CA Urban Forester, and an ISA Qualified Tree Risk Assessor. In 1972, Susan, alongside her husband, Gary, started Sims Tree Health Specialists, Inc. Since then, the family became a household name in the tree care industry, known for their education and experience in tree care efforts. In 1997, they further advanced their education efforts by starting Sims Tree Learning Center (TLC), a botanical garden and arboretum that focuses on the research and education of trees. Though she is mostly retired, you can still find Sue spending her days gardening in the olive orchard located at the family’s Northern California branch of Sims TLC and volunteering in causes dedicated to the education of trees and gardening.
