Skip to Main Content
Ethanol attracts scolytid beetles to Phytophthora ramorum cankers on coast live oak [Abstract]Author(s): Rick G. Kelsey; Maia Beh; Dave Shaw; Daniel K. Manter
Source: In: Frankel, S.J.; Kliejunas, J.T.; Palmieri, K.M.; Alexander, J.M. tech. coords. Proceedings of the sudden oak death fifth science symposium. Gen. Tech. Rep. PSW-GTR-243. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station: p. 147
Publication Series: General Technical Report (GTR)
Station: Pacific Southwest Research Station
PDF: View PDF (0 B)
DescriptionSuccessful infection of coast live oak (Quercus agrifolia Née) stems by Phytophthora ramorum results in the formation of a canker visible initially at the bark surface by the release of a dark red to black colored exudate referred to as "bleeding." Bark and ambrosia beetles are often attracted to diseased trees within the first year after bleeding cankers appear, and bore their gallery entrance holes almost exclusively within the canker boundaries, suggesting the presence of a primary attractant. These attacks accelerate tree mortality. Ethanol concentrations were analyzed in sapwood samples collected from paired diseased and healthy trees at three study sites in California. Samples from diseased trees were taken inside and outside of the boundaries of small spot cankers and larger cankers at the stem base. Trees with large basal cankers contained 4.3 times more sapwood ethanol than trees with spot cankers. Sapwood from within cankers had the highest concentrations, with 4.3 and 15.5 times more ethanol than sapwood from 1 cm or 15 to 30 cm outside the canker boundary, respectively. Paired healthy trees had the lowest sapwood ethanol levels.
- You may send email to email@example.com to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationKelsey, Rick G.; Beh, Maia; Shaw, Dave; Manter, Daniel K. 2013. Ethanol attracts scolytid beetles to Phytophthora ramorum cankers on coast live oak [Abstract]. In: Frankel, S.J.; Kliejunas, J.T.; Palmieri, K.M.; Alexander, J.M. tech. coords. Proceedings of the sudden oak death fifth science symposium. Gen. Tech. Rep. PSW-GTR-243. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station: p. 147.
KeywordsSudden oak death, Phytophthora ramorum, invasive species, tanoak, Notholithocarpus densiflorus, coast live oak, Quercus agrifolia, Japanese larch, Larix kaempferi
- Phytophthora ramorum in coast live oak: search for resistance and mechanisms.
- Metabolite profiling to predict resistance to Phytophthora ramorum in natural populations of coast live oak
- Diagnosis and Management of Phytophthora ramorum canker in canyon live oak, an atypical bole canker host
XML: View XML