Robert Raabe

Professor Emeritus and UC Plant Pathologist Robert Raabe prepared this extensive presentation on diseases of ornamentals and other garden plants especially for UC Master Gardeners, but any serious gardener will benefit from Dr. Raabe's insights. This lecture features more than 300 photographs illustrating the symptoms of infectious and noninfectious conditions. Recorded in Contra Costa County in the San Francisco Bay area.

Topics discussed:

Symptoms of poor watering
Soil toxicity
Bacterial and fungal infections
Poor cultural practices
Wilting, overgrowths, stunting, and color changes

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Plant Disease Part I 90 minutes

Plant Disease Part II 90 minutes

For the entire series: UC Master Gardener Lecture Series

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Take the Quizzes!

They can be taken as a pre-test, post-test, or both. Take each one before you watch the video and compare the results to when you take them after you watch the video.

Plant Diseases Quiz, Part 1

Plant Diseases Quiz, Part 2

Quizzes offered on this site allow you to test your knowledge of the subject. They are not part of a Master Gardener Certification program. Contact your local Cooperative Extension office for information about becoming a Master Gardener.

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Plant Diseases--Files you can download

Note: these materials were developed for Master Gardeners in the San Francisco Bay area of California

Below are Adobe Acrobat PDF files--You can download the free Adobe Acrobat file reader here: http://www.adobe.com/products/acrobat/readstep2.html

Plant Disease Outline

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Master Gardener Lecture