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Effects of inoculum density and wounding on stem infection of three eastern US forest species by Phytophthora ramorumAuthor(s): P.W. Tooley; M. Browning; R.M. Leighty
Source: Journal of Phytopathology. 162(10): 683-689
Publication Series: Scientific Journal (JRNL)
Station: Pacific Southwest Research Station
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DescriptionSeedlings of three Eastern US forest species Quercus rubra (northern red oak), Quercus prinus (chestnut oak) and Acer rubrum (red maple) were inoculated by applying Phytophthora ramorum sporangia to stems at different inoculum densities with and without wounding. Disease occurred in all treatments involving wounds, and no disease was observed in unwounded treatments. Younger seedlings (2-3 years old) did not differ significantly from older seedlings (5-6 years old) in disease incidence, but older seedlings sustained smaller lesions compared with younger seedlings. For both old and young seedlings, disease on wounded stems was observed down to the lowest sporangia concentration utilized (500 sporangia/ml for old seedlings and 100 sporangia/ml for young seedlings). The results show that in the presence of wounding, even very low sporangia concentrations can result in disease, and further suggest that wounding caused by insects and other factors may play an important role in P. ramorum epidemiology in forest environments.
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CitationTooley, P.W.; Browning, M.; Leighty, R.M. 2014. Effects of inoculum density and wounding on stem infection of three eastern US forest species by Phytophthora ramorum. Journal of Phytopathology. 162(10): 683-689.
Keywordsepidemiology, ramorum blight, sudden oak death
- Infection of five Phytophthora ramorum hosts in response to increasing inoculum levels
- Inoculum Density Relationships for Infection of Some Eastern US Forest Species by Phytophthora ramorum
- Aspect induced differences in vegetation, soil, and microclimatic characteristics of an Appalachian watershed
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