These lectures was produced for the e-GRO (Electronic Grower Resources Online), which is a collaborative effort of floriculture specialists to create a new clearing house for alerts about disease, insect, environmental, physiological and nutritional disorders being observed in commercial greenhouses. This website has information is available about disorders, links to podcasts, and links to research.

There are lots of videos.  The ones most relevant to home gardeners are:

• What is a Plant Disease
• Diagnosis of Plant Diseases
• Powdery Mildews
• Downy Mildews
• Botrytis Blight
• Fungal and Bacterial Leaf Spots
• Rusts
• Vascular Wilts
• Damping off and Root Rot Diseases