This competency-based curriculum unit on insects and diseases is one of four developed for classroom use in teaching the turf and lawn services area of horticulture. The five sections are each divided into teaching content (in a question-and-answer format) and student skills that outline steps and factors for consideration. Topics covered include root-feeding insects, shoot-feeding insects, and fungicides. A list of references precedes a section containing visual aids, student skill checklist, and student activities, such as handouts, discussion activities, field trips, crossword puzzles, hands-on experiences, worksheets, tests, and quizzes. Answer keys are provided. (KC)