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Host specificity of Phytophthora megasperma from Douglas fir, soybean, and alfalfa



Host specificity of Phytophthora megasperma from Douglas fir, soybean, and alfalfa



Phytopathology 71(1): 65-68



Pathogenicity of 28 isolates towards Douglas fir was tested by: (a) inoculating 8-month-old seedlings through cuts in the main stem and measuring the length of the resulting lesion after 42 days in a greenhouse; and (b) by planting 2-yr-old seedlings in infested soil, and scoring the root systems for discoloration after 8 wk. Of 19 isolates from Douglas fir 6 were pathogenic to both Douglas fir and soybean, causing extensive root rot and large lesions on tree seedlings.

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Accession: 000903218

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