Symptoms induced by Iris yellow spot virus (IYSV) on onion scapes (seed stalks) taken from flowering onion plants.
H.R. Pappu1, R. Sampangi2 and S.K. Mohan21Department of Plant Pathology, Washington State University, Pullman, WA 99164; 2University of Idaho Parma Research and Extension Center, Parma, ID 83660.Email: email@example.com
Iris yellow spot virus (IYSV) has become a production constraint to onion bulb and seed crops in the Pacific Northwest region of the U.S. and many other areas of onion bulb or seed production in the world. First described from the Treasure Valley of Idaho in the early 1990s, epidemics have been observed in both onion bulb and seed crops since 2000. Characteristic symptoms include diamond-shaped lesions on scapes (seed stalks) which may expand and coalesce leading to drying and eventual lodging of scapes. Lesions can be seen on scapes even after the harvest (bottom most scape). Severe cases of lodging may make the crop unharvestable resulting in near or total crop loss.
APS publication number: IW000075
Picture your photograph as the APSnet Featured ImageClick here to find out more
License to Copy. This notice hereby grants permission to APSnet users to copy the image featured for noncommercial, personal use. All components of APSnet are copyrighted and may not be reproduced or distributed except by express permission of APS. Copyright is not claimed for material provided by United States government employees as part of their work. APSnet copyright extends to images, text, graphics, photographs, illustrations, audio, video, computer software, and all other elements of the site.Instructions to Copy. For PC, position your mouse cursor on the featured image, click the right mouse button, and choose "Save Picture As..." or "Save this Image as..." whichever is the case. For Mac, click the only mouse button and follow the same steps. Users may want to set up a specific directory and file naming scheme for storing images; otherwise, they will be saved using your system defaults. Images may be used in any software application that supports JPEG file format or viewed in an Internet browser as local files.