Regional and annual trends in Douglas-fir foliage retention: Correlations with climatic variables

Zhao, Junhui; Mainwaring, Douglas B.; Maguire, Douglas A.; Kanaskie, Alan

doi:10.1016/j.foreco.2011.08.008

Cited by 31 publications

(40 citation statements)

References 19 publications

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“…3 Survival probability of Douglas-fir needles by age class In general both cohort survival rates and average foliage retention declined as winter temperatures and spring precipitation increased, and increased as summer temperature increased (Zhao et al 2011 and results presented above). Similar climatic variables have also been shown to influence indices of SNC infection intensity based on the frequency of stomatal occlusion by pseudothecia (Manter et al 2005;Stone et al 2007).…”

Section: Discussionmentioning

confidence: 94%

“…These key variables were then introduced into alternative parametric models, identifying the lognormal distribution as best and providing a model that could be compared to previous work analyzing the spatial and temporal variability in foliage retention (Manter et al 2005;Stone et al 2007;Zhao et al 2011).…”

Section: Discussionmentioning

confidence: 99%

“…In the effort to create hazard rating maps for SNC in the Coast Ranges of Oregon and Washington, quantitative links between foliage retention and climate variables have been established using varying methodologies (Rosso and Hansen 2003;Manter et al 2005;Coop and Stone 2007;Latta et al 2009;Zhao et al 2011). In each of these analyses, tree-level foliage retention is calculated as the summed proportions of needles surviving in each annual cohort.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, some younger annual cohorts may start to lose foliage before older cohorts. Zhao et al (2011) analyzed the influence of local climatic factors on spatial and temporal variation on SNC as measured by average foliage retention. Modeling the effect of climatic factors on individual needle cohorts may further advance our understanding of mechanisms behind infection and mycelial development, and subsequent intensification of SNC.…”

Section: Introductionmentioning

confidence: 99%

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Climatic influences on needle cohort survival mediated by Swiss needle cast in coastal Douglas-fir

Zhao

Maguire

Mainwaring

et al. 2012

Trees

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Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Climatic influences on needle cohort survival mediated by Swiss needle cast in coastal Douglas-fir

Zhao

Maguire

Mainwaring

et al. 2012

Trees

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“…Numerous climate-disease models have been developed. Depending on the model, disease symptoms (needle retention, growth loss) are associated with warm winter (December-February) [11], March-August mean monthly temp [20], distance from coast [17], or continentality index [21]. Lee et al [22] contend that winter conditions are important at cooler, wetter sites, and that summer conditions are more important at less humid, warmer sites.…”

Section: Discussionmentioning

confidence: 99%

Swiss Needle Cast in Western Oregon Douglas-Fir Plantations: 20‐Year Monitoring Results

Ritóková

Shaw

Filip

et al. 2016

Forests

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Swiss needle cast (SNC), a foliar disease specific to Douglas-fir (Pseudotsuga menziesii), is caused by an endemic Ascomycete fungus (Phaeocryptopus gaeumannii). In the late 1980s and early 1990s significant symptoms began to appear in coastal Oregon, and these have been associated with the planting of Douglas-fir in the Sitka spruce zone, leaf wetness during potential spore dispersal in May-August, and mild winter temperature. The first annual aerial survey was initiated in 1996 and has continued through 2015, which indicates a significant increase in area of visible symptoms from the air, increasing from 53,050 ha in 1996 to 238,705 ha in 2015. Monitoring plots in the NW Oregon Coast Range verified impacts of SNC on tree growth and productivity, with growth reductions averaging about 23% in the epidemic area linked to needle retention. A series of monitoring plots was set up in the western Cascade Mountains of Oregon and 590 10-23-year old Douglas-fir trees in 59 stands were tracked for 10 years, measured in 2001, 2006, and 2011. No measureable growth impacts were noted in this region of Oregon. A new plot network is being installed throughout the Oregon and southwest Washington coastal ranges as a means of monitoring future disease impact and providing framework for additional studies.

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Regional patterns of increasing Swiss needle cast impacts on Douglas‐fir growth with warming temperatures

Lee

Beedlow

Waschmann

et al. 2017

Ecology and Evolution

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The fungal pathogen, Phaeocryptopus gaeumannii, causing Swiss needle cast (SNC) occurs wherever Douglas‐fir is found but disease damage is believed to be limited in the U.S. Pacific Northwest (PNW) to the Coast Range of Oregon and Washington (Hansen et al., Plant Disease, 2000, 84, 773; Rosso & Hansen, Phytopathology, 2003, 93, 790; Shaw, et al., Journal of Forestry, 2011, 109, 109). However, knowledge remains limited on the history and spatial distribution of SNC impacts in the PNW. We reconstructed the history of SNC impacts on mature Douglas‐fir trees based on tree‐ring width chronologies from western Oregon. Our findings show that SNC impacts on growth occur wherever Douglas‐fir is found and is not limited to the coastal fog zone. The spatiotemporal patterns of growth impact from SNC disease were synchronous across the region, displayed periodicities of 12–40 years, and strongly correlated with winter and summer temperatures and summer precipitation. The primary climatic factor limiting pathogen dynamics varied spatially by location, topography, and elevation. SNC impacts were least severe in the first half of the 20th century when climatic conditions during the warm phase of the Pacific Decadal Oscillation (1924–1945) were less conducive to pathogen development. At low‐ to mid‐elevations, SNC impacts were most severe in 1984–1986 following several decades of warmer winters and cooler, wetter summers including a high summer precipitation anomaly in 1983. At high elevations on the west slope of the Cascade Range, SNC impacts peaked several years later and were the greatest in the 1990s, a period of warmer winter temperatures. Climate change is predicted to result in warmer winters and will likely continue to increase SNC severity at higher elevations, north along the coast from northern Oregon to British Columbia, and inland where low winter temperatures currently limit growth of the pathogen. Our findings indicate that SNC may become a significant forest health problem in areas of the PNW beyond the coastal fog zone.

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Regional and annual trends in Douglas-fir foliage retention: Correlations with climatic variables

Cited by 31 publications

References 19 publications

Climatic influences on needle cohort survival mediated by Swiss needle cast in coastal Douglas-fir

Climatic influences on needle cohort survival mediated by Swiss needle cast in coastal Douglas-fir

Swiss Needle Cast in Western Oregon Douglas-Fir Plantations: 20‐Year Monitoring Results

Regional patterns of increasing Swiss needle cast impacts on Douglas‐fir growth with warming temperatures

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