Pacific Southwest

Title: Susceptibility of some native plant species from Hawaii to Phytophthora ramorum

Author: Reeser, Paul; Hansen, Everett; Sutton, Wendy; Davidson, Jennifer; Parke, Jennifer

Date: 2008

Source: 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

Station ID: GTR-PSW-214

Description: 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.

Keywords: Sudden oak death, Metrosideros polymorpha (ohia), Vaccinium calycinum (ohelo), Vaccinium reticulatum, Acacia koa (koa), and Leptecophylla tameiameiae(pukiawe)

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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.