The Biology of Fungal Pathogens, Volume 3: Fungal Pathogens and Diseases in Cereals DVD

3.1 Barley Leaf Spots – Fungal Disease or Stress Response? (14:00 min)

Necrotic leaf spots on barley caused by abiotic or biotic factors have gained considerable importance in some regions where the crop is grown. This disease complex may significantly affect yield and represents a challenge both to proper diagnosis and disease management. A new biotic barley disease caused by the fungal pathogen Ramularia collo-cygni causes necrotic leaf spots. The video illustrates the life cycle of the pathogen and differentiates the disease symptoms and etiology from abiotic leaf spots, the so-called ‘physiological leaf spots’ (PLS). PLS are induced by a complex of environmental stress factors including, excess irradiation, drought, air pollutants, or extreme temperatures, which cause elevated levels of free unscavenged oxygen radicals in the leaf tissue. The video represents the sequence of events leading from generation of toxic oxygen radicals to induction of cell death and necrosis. Finally the impact of modern fungicides on this leaf spot complex is represented, with special emphasis on physiological fungicide effects on the plant.

Although PLS/Ramularia appears less prevalent in North America as compared to Europe and Australia, this disease should not be overlooked. Because it is new and diagnostic expertise is scarce, the onset in North American barley regions may be similar to what's been seen in other regions of the world. Therefore, this video provides timely information to researchers, diagnosticians, and educators in the United States and Canada.

The Biology of Fungal Pathogens, Volume 3 Terms of Use

Standard Limited Use License

The Biology of Fungal Pathogens, Volume 3 is protected by copyright and its use is limited. It may be shown to, or viewed by, groups within a classroom or educational presentation setting, but may not be made available via local area network (LAN) without permission (permission for LAN also requires an additional LAN license fee). It may not be copied, or otherwise duplicated to share with other individuals in full or in part. It may not be transferred to the Internet in full or in part.

Local Area Network (LAN) License Upgrade

The DVD and its content may not be run concurrently on more than one computer and it may not be networked unless an upgraded Local Area Network (LAN) License is purchased. If a LAN License is purchased, its use is limited to a specific site access and must be controlled to include only staff and/or students at that location. Within the LAN License the videos may be shown with the same privileges as the Limited Use License and also allows the videos to be viewed by students and staff autonomously as long as they are limited to access from the specified single location. If you are interested in a LAN license for this product, please contact aps@scisoc.org for a price quote. Include the following information: Institution name and site address, approximate number of people on the network, approximate number of staff or students interested in the content, contact name and title.

If you are uncertain which license privileges of the DVD you qualify for, please contact aps@scisoc.org. Distribution without the permission of the publishers is prohibited. Infringements will be prosecuted under civil and criminal law.