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Dive into the research topics where F. Workneh is active.

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Featured researches published by F. Workneh.


Plant Disease | 2010

Effects of Wheat streak mosaic virus on Root Development and Water-Use Efficiency of Hard Red Winter Wheat

Jacob A. Price; F. Workneh; S. R. Evett; David C. Jones; J. Arthur; C. M. Rush

Greenhouse and field studies were conducted to determine the effects of Wheat streak mosaic virus (WSMV), a member of the family Potyviridae, on root development and water-use efficiency (WUE) of two hard red winter wheat (Triticum aestivum) cultivars, one susceptible and one resistant to WSMV. In the greenhouse studies, wheat cultivars were grown under three water regimes of 30, 60, and 80% soil saturation capacity. After inoculation with WSMV, plants were grown for approximately 4 weeks and then harvested. Root and shoot weights were measured to determine the effect of the disease on biomass. In all water treatments, root biomass and WUE of inoculated susceptible plants were significantly less (P < 0.05) than those of the noninoculated control plants. However, in the resistant cultivar, significance was only found in the 30 and 60% treatments for root weight and WUE, respectively. Field studies were also conducted under three water regimes based on reference evapotranspiration rates. Significant reductions in forage, grain yield, and crop WUE were observed in the inoculated susceptible plots compared with the noninoculated plots. Both studies demonstrated that wheat streak mosaic reduces WUE, which is a major concern in the Texas Panhandle because of limited availability of water.


Plant Disease | 2017

Relationships Between Early Wheat Streak Mosaic Severity Levels and Grain Yield: Implications for Management Decisions

F. Workneh; S. O’Shaughnessy; S. R. Evett; C. M. Rush

Wheat streak mosaic (WSM) caused by Wheat streak mosaic virus, which is transmitted by the wheat curl mite (Aceria tosichella), is a major yield-limiting disease in the Texas High Plains. In addition to its impact on grain production, the disease reduces water-use efficiency by affecting root development. Because of the declining Ogallala Aquifer water level, water conservation has become one of the major pressing issues in the region. Thus, questions are often raised as to whether it is worthwhile to irrigate infected fields in light of the water conservation issues, associated energy costs, and current wheat prices. To address some of these questions, field experiments were conducted in 2013 and 2016 at two separate locations to determine whether grain yield could be predicted from disease severity levels, assessed early in the spring, for potential use as a decision tool for crop management, including irrigation. In both fields, disease severity assessments started in April, using a handheld hyperspectral radiometer with which reflectance measurements were taken weekly in multiple plots in arbitrarily selected locations across the fields. The relationship between WSM severity levels and grain yield for the different assessment dates were determined by fitting reflectance and yield values into the logistic regression function. The model predicted yield levels with r2 values ranging from 0.67 to 0.85 (P < 0.0001), indicating that the impact of WSM on grain yield could be fairly well predicted from early assessments of WSM severity levels. As the disease is normally progressive over time, this type of information will be useful for making management decisions of whether to continue irrigating infected fields, especially if combined with an economic threshold for WSM severity levels.


Crop Protection | 2010

Economic impact of Wheat streak mosaic virus in the Texas High Plains

Margarita Velandia; Roderick M. Rejesus; David C. Jones; Jacob A. Price; F. Workneh; C. M. Rush


Plant Disease | 2011

Satellite remote sensing of wheat infected by Wheat streak mosaic virus.

Mustafa Mirik; David C. Jones; Jacob A. Price; F. Workneh; R.J. Ansley; C. M. Rush


Plant Disease | 2014

Zebra Chip Disease Development in Relation to Plant Age and Time of ‘Candidatus Liberibacter solanacearum’ Infection

Arash Rashed; F. Workneh; L. Paetzold; J. Gray; C. M. Rush


2015 ASABE / IA Irrigation Symposium: Emerging Technologies for Sustainable Irrigation - A Tribute to the Career of Terry Howell, Sr. Conference Proceedings | 2015

Site-Specific Variable Rate Irrigation as a Means to Enhance Water Use Efficiency

Susan A. O’Shaughnessy; Steven R. Evett; Alejandro Andrade; F. Workneh; Jacob A. Price; Charles M. Rush


Archive | 2018

Economic Threshold of Wheat Streak Mosaic Virus in the Texas High Plains

Brian P. Mulenga; B. Wade Brorsen; Francis M. Epplin; Charles M. Rush; F. Workneh


American Journal of Potato Research | 2017

Effects of Holding Temperatures on the Development of Zebra Chip Symptoms, ‘ Candidatus Liberibacter Solanacearum’ Titers, and Phenolic Levels in ‘Red La Soda’ and ‘Russet Norkotah’ Tubers

Christopher M. Wallis; Arash Rashed; F. Workneh; L. Paetzold; C. M. Rush


Plant Disease | 2016

Population Dynamics of Released Potato Psyllids and their Bacteriliferous Status in Relation to Zebra Chip Incidence in Caged Field Plots

F. Workneh; L. Paetzold; Arash Rashed; C. M. Rush


Archive | 2016

CHAPTER 15: ‘Candidatus Liberibacter’ Species and Related Diseases

Nian Wang; Qing Yan; F. Workneh; Arash Rashed; Charles M. Rush

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Charles M. Rush

United States Department of Agriculture

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Christopher M. Wallis

Agricultural Research Service

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Nian Wang

University of Florida

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