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Abstract
The remaining native flora of Hawaii are under continuing pressure from habitat loss and exotic, invasive organisms, including animals, plants, and pathogens. In order to assess the risk to
P. ramorum, we inoculated seedlings of
Metrosideros polymorpha (ohia),
Vaccinium calycinum (ohelo),
Acacia koa (koa), and
Leptecophylla tameiameiae (pukiawe) with the pathogen. Two isolates were used, one from an Oregon horticultural nursery, and one from tanoak in the Oregon infested forest area. A zoospore suspension was sprayed on the intact plants. Plants were inspected periodically and symptomatic plants or plant parts were harvested and photographed. For isolation of
P. ramorum symptomatic tissue was surface disinfested and plated in semi-selective agar. There was some symptom development in some inoculated plants for all the species tested. However, infection was confirmed by re-isolation of
P. ramorum only in ohelo, pukiawe, and koa. Detached leaf inoculation also demonstrated usceptibility of
Vaccinium reticulatum, another species of ohelo.
Parent Publication
Citation
Reeser, Paul; Hansen, Everett; Sutton, Wendy; Davidson, Jennifer; Parke, Jennifer. 2008. Susceptibility of some native plant species from Hawaii to
Phytophthora ramorum. In: Frankel, Susan J.; Kliejunas, John T.; Palmieri, Katharine M., tech. coords. 2008. Proceedings of the sudden oak death third science symposium. Gen. Tech. Rep. PSW-GTR-214. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station. pp. 437-438
