2012 Annual Report 1a.Objectives (from AD-416): To identify the host range of Powell Butte Globodera. 1b.Approach (from AD-416): This research will. 1)survey the remainder of the OSU farm to determine the extent of the infestation and to collect additional cysts, and. 2)investigate PBG’s host range including potato. 3.Progress Report: The potato cyst nematodes (Globodera rostochiensis and Globodera pallida) are of regulatory concern to the United States because of their potential impact on potato production and on the ability of U.S. growers to export potatoes to other countries. Because of these concerns, surveys have been conducted to determine the occurrence and distribution of these nematodes in the United States. During one such survey in Oregon, an atypical Globodera was found that could not be identified as G. rostochiensis or G. pallida based upon morphological and molecular data. Because of the inability to place this nematode into a species, the host range of this nematode and its ability to parasitize potato are unknown. Research was conducted to identify the host range of this nematode. The atypical Globodera was added to the roots of nine potato varieties, tomato, alfalfa, and wheat; the potato varieties ranged in their host status to G. rostochiensis and G. pallida. Both potato and tomato were host to the atypical Globodera; wheat and alfalfa were not. The potato varieties evaluated varied in host status with some varieties having resistant to G. rostochiensis also demonstrating resistant to the atypical Globodera. Research to determine if this Globodera is a pathogen to potato is ongoing. This research was conducted in support of objective 303 2C: Ecology and Epidemiology of Plant Diseases of the parent project.