The objective of this course is to provide students with a biological basis for recognizing, diagnosing, and managing insects and pathogens affecting multiple uses of forest resources. This course describes the roles insects and pathogens play in natural ecosystem processes such as gap formation, nutrient cycling, and succession, as well as the challenges these biotic stress agents pose to sustainable management. These challenges include tradeoffs among multiple values, economic and environmental consequences of various pest management approaches, and natural resource issues such as biological invasions. The general principles of plant pathology, entomology, and pest management are introduced, followed by descriptions of the specific insects and disease agents involved. This course is structured to provide multiple modalities of learning: Lectures emphasize the integration of life history information with available management options. Laboratory sessions emphasize recognition of insects, microorganisms, and host tree symptoms. Field trips are intended to provide first-hand experience with insect and disease activities and consequent problems under actual growing conditions.