Susceptibility of Oregon Forest Trees and Shrubs to Phytophthora ramorum: A Comparison of Artificial Inoculation and Natural Infection

Plant Disease
E M HansenW Sutton

Abstract

Phytophthora ramorum is an invasive pathogen in some mixed-hardwood forests in California and southwestern Oregon, where it causes sudden oak death (SOD) on some members of Fagaceae, ramorum shoot dieback on some members of Ericaceae and conifers, and ramorum leaf blight on diverse hosts. We compared symptoms of P. ramorum infection resulting from four different artificial inoculation techniques with the symptoms of natural infection on 49 western forest trees and shrubs; 80% proved susceptible to one degree or another. No single inoculation method predicted the full range of symptoms observed in the field, but whole plant dip came closest. Detached-leaf-dip inoculation provided a rapid assay and permitted a reasonable assessment of susceptibility to leaf blight. Both leaf age and inoculum dose affected detached-leaf assays. SOD and dieback hosts often developed limited leaf symptoms, although the pattern of midrib and petiole necrosis was distinctive. Stem-wound inoculation of seedlings correlated with field symptoms for several hosts. The results suggested that additional conifer species may be damaged in the field. Log inoculation provided a realistic test of susceptibility to SOD, but was cumbersome and subject to seasonal ...Continue Reading

Citations

Apr 14, 2012·Nature·Matthew C FisherSarah J Gurr
Nov 26, 2019·Biological Reviews of the Cambridge Philosophical Society·Amy E ZanneKathleen K Treseder
Oct 12, 2007·Journal of Chemical Ecology·Daniel K ManterJoseph J Karchesy
Jun 1, 2010·Plant Disease·Aleksandra BulajićBranka Krstić
Feb 23, 2020·Scientific Reports·Giorgia G Auteri, L Lacey Knowles
Jan 13, 2017·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Lida DerevninaSophien Kamoun
Jul 13, 2013·Annals of the New York Academy of Sciences·Gary M LovettJacob M Griffin
Sep 26, 2013·Evolutionary Applications·Katherine J HaydenJessica W Wright
Apr 1, 2007·Plant Disease·Paul W Tooley, Kerrie L Kyde
Mar 30, 2016·Fungal Biology·George MatusickLori G Eckhardt

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