College of Agricultural, Human, and Natural Resource Sciences

Department of Plant Pathology

Successful Defense

Lydia Tymon completed the requirements for a PhD degree from the Department of Plant Pathology, Washington State University.  Her supervisory committee included Dennis Johnson (chair), Mark Pavek, Tobin Peever, and George Vandemark. Her dissertation title was “Frequency of isolation, determination, and epidemiology of Alternaria species on potato in the Pacific Northwest.”  From cultures isolated from early blight and brown spot type lesions on potato leaves collected in the Pacific Northwest (PNW) between 2008 and 2011, she detected A. alternate from 34.8% and A. arborescens froPhoto of Lydia Tymonm 54.5% of the isolates, and also identified A. oregonensis, A. arbusti, and A. metachromatica by sequencing.  She discovered that wounding had a significant impact on infection frequencies and area under the lesion expansion curve for A. alternata and A. arbusti, but not on those of A. solani.  She found differences in susceptibility of potato cultivars to the three species.  She determined the range of resistance of A. solani and A. alternata to azoxystrobin and boscalid fungicides, and observed an increase in the boscalid resistance in A. solani between 2010 and 2011. Lydia graduated from the University of Washington (UW) with a BS in Botany in 1998 and then returned to the UW and completed her MS under the supervision of Dean Glawe and Bob Edmonds in 2009. Her MS research was on the taxonomy of powdery mildew fungi on rhododendron in the PNW. Lydia will move to the University of Idaho as a postdoctoral research associate under the supervision of Brenda Schroeder in June.

Department of Plant Pathology, PO Box 646430, Washington State University, Pullman WA 99164-6430, 509-335-9541, Contact Us
© 2017 Washington State University | Accessibility | Policies | Copyright | Log in