Pathogenicity of Leptographium procerum and L. terebrantis on Pinus strobus seedlings and established trees

The pathogenicity of Leptographium terebrantis and Leptographium wageneri, was compared with that of eight isolates of L. procerum from different parts of the world by wound inoculation of two-year-old Pinus strobus seedlings. Isolates of L. procerum caused limited discoloration around inoculation sites whereas L. terebrantis caused girdling cankers and L. wageneri systemically invaded seedlings. Only three of 160 seedlings inoculated with various isolates of L. procerum died; L. terebrantis and L. wageneri killed 17 and 15 of 20 seedlings inoculated respectively. Inoculation of L. procerum and controls caused localised discoloration around inoculation points and inoculation with L. terebrantis resulted in lesions up to 150 cm long on 15-year-old P. strobus. Lesions associated with L. procerum were however significantly longer than the discolored areas on control plants. In comparison with L. terebrantis, L. procerum appears to be a weak wound pathogen.

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