Index Catalog // ScholarsArchive@OSU

Creator:: Morin, Louise, Gomez, Don R., Evans, Katherine J., Neill, Tara M., Mahaffee, Walt F., and Linde, Celeste C.
Abstract:: Field surveys in 2006 confirmed that the exotic rust fungus Phragmidium violaceum was widespread on Rubus armeniacus and Rubus laciniatus in the Pacific Northwest of the USA. The origin and dispersal pattern of this obligate biotrophic pathogen in the USA were investigated by comparing the genetic diversity and structure of...
Resource Type:: Article
Full Text:: Louise Morin • Don R. Gomez • Katherine J. Evans • Tara M. Neill • Walt F. Mahaffee • Celeste C. Linde

Creator:: Pfender, W. F., Gent, D. H., and Mahaffee, W. F.
Abstract:: Many plant disease epidemic models, and the disease management decision aids developed from them, are created based on temperature or other weather conditions measured in or above the crop canopy at intervals of 15 or 30 min. Disease management decision aids, however, commonly are implemented based on hourly weather measurements...
Resource Type:: Article
Full Text:: University Department of Botany and Plant Pathology, and W. F. Mahaffee, USDA-ARS Horti- cultural Crops

Creator:: Gent, David H., Mahaffee, Walter F., McRoberts, Neil, and Pfender, William F.
Abstract:: Disease predictive systems are intended to be management aids. With a few exceptions, these systems typically do not have direct sustained use by growers. Rather, their impact is mostly pedagogic and indirect, improving recommendations from farm advisers and shaping management concepts. The degree to which a system is consulted depends...
Resource Type:: Article
Full Text:: . Gent,1,3,∗ Walter F. Mahaffee,2,3 Neil McRoberts,4 and William F. Pfender1,3 1U.S. Department of

Creator:: Gent, David H., Nelson, Mark E., Grove, Gary G., Mahaffee, Walter F., Turechek, William W., and Woods, Joanna L.
Abstract:: Downy mildew (caused by Pseudoperonospora humuli) and powdery mildew (caused by Podosphaera macularis) are important diseases of hop in the Pacific Northwest United States, and cultural practices may affect the severity of both diseases. The association of spring pruning quality and timing with severity of downy mildew and powdery mildew...
Resource Type:: Article
Full Text:: Research and Extension Center, Prosser 99350; Walter F. Mahaffee, USDA-ARS, Horticultural Crops Research

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