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Evaluating the Pathogenicity of Pythium vexans Isolates from Fraser Fir in North Carolina

K. L. Ivors, Z. G. Abad, and D. M. Benson

October 2008


Christmas trees are important nursery crops in the USA, with North Carolina leading production of Fraser fir, but phytophthora root rot and stem canker have casued significant damage. Recently, samples of Fraser and Canaan fir with typical root rot symptoms were diagnosed with Pythium vexans. Some experts were unsure how to respond. This research evaluated the pathogenicity of P. vexans on Fraser fir. Phytophthora cinnamomi, known as an aggressive pathogen on this host, was used as a standard for comparison.


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