College of Agricultural, Human, and Natural Resource Sciences

Department of Plant Pathology

PhD Graduate

Tymon graduation

Front row: Lydia Tymon
Back row: Lori Carris, Tobin Peever, Axel Elling

Lydia Tymon recently completed the requirements for a Ph.D. in Plant Pathology under the supervision of Dr. Dennis Johnson, Professor of Plant Pathology. Her supervisory committee also included Mark Pavek, Tobin Peever, and George Vandemark. The title of Lydia’s dissertation 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 the frequency of A. alternata and A. arborescens and identified A. oregonensis, A. arbusti, and A. metachromatica by sequencing. She determined the effect that wounding had on infection frequencies and aggressiveness some species of Alternaria and that there are differences in susceptibility of potato cultivars to the three species. Lastly, she examined the range of fugnicide 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.

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