HOR 238 Plant Problem Diagnosis

Lecture Hours: 2
Credits: 2

Covers the basic principles of plant problem diagnosis in landscapes and gardens, based on available symptoms and signs. Focuses on distinguishing cultural and environmental problems from those caused by organisms, and mitigating those problems. Introduces the identification of specific biotic causes of plant problems, including fungal, bacterial, and viral plant diseases, insect pests, and vertebrate pest problems. Includes local examples. Identifies book and web-based resources for problem identification.

Student Learning Outcomes:

Diagnose a plant problem correctly based on available symptoms and signs.
Distinguish environmental and cultural problems from those caused by biotic organisms.
Identify and use appropriate resource books and websites to assist in identifying problems and suggesting appropriate solutions.

Content Outline

Overview of Plant Problem Diagnosis
- Pesticide use (and misuse) in landscapes: the value of correct problem identification
- Plant identification
- Basic questions to ask in problem diagnosis
- Tools for gathering information from clientele
Cultural and Environmental Problems
- Matching the plant to the site
- Soil quality
- Water management
- Nutrient management
- Pesticide misuse
Biotic Problems
- Fungal diseases
- Bacterial diseases
- Viruses
- Insect and mite pests
- Vertebrate pests
- Other issues: mushrooms, mosses, lichens
Common Problems on Common Landscape Plants
Resources for Problem Solving: Books
Resources for Problem Solving: Websites
Practicum on Problem Solving