At the 2007 ADS convention Gary Chastagner gave a talk on daffodil diseases. He has allowed the ADS to make his slide program available. We do not have a script or commentary, so viewing the slides, while helpful, does not give you the full benefit of the original presentation. The slides are made available here as a PDF file. It has 39 slides. It covers such subjects as bulb fly, nematodes, basal rot, and foliar diseases. If you are unfamiliar with PDF, click the “About PDF” link in the sidebar.
Note that the slide program is copyrighted by the author, not by the ADS, so you must contact the author if you want to do anything besides look at the program. Dr. Gary A. Chastagner is a plant pathologist at the Washington State University Puyallup Research & Extension Center at 2606 West Pioneer, Puyallup, WA 98371-4998. His phone number is (253) 445-4528 and e-mail address is email@example.com.