Effect of Swiss needle cast on Douglas-fir stem ethanol and monoterpene concentrations, oleoresin flow, and host selection by the Douglas-fir beetle

Kelsey, Rick G.; Manter, Daniel K.

doi:10.1016/j.foreco.2003.10.019

Cited by 8 publications

(6 citation statements)

References 45 publications

(68 reference statements)

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“…The lack of evidence for SNC-induced mortality in Douglas-fir plantations ( Maguire et al 2011 ) is partially because of the decreased likelihood of secondary mortality agents. For example, the Douglas-fir beetle is not attracted to SNC diseased Douglas-fir trees ( Kelsey and Manter 2004 ). Carbon starvation and lack of tree resources for production of protective chemicals and ethanol may be the reason.…”

Section: Hydrologic and Trophic Interactionsmentioning

confidence: 99%

Persistence of the Swiss Needle Cast Outbreak in Oregon Coastal Douglas-Fir and New Insights from Research and Monitoring

Shaw

Ritóková

Lan

et al. 2021

Journal of Forestry

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Swiss needle cast (SNC), caused by Nothophaeocryptopus gaeumannii, is a foliage disease of Douglas-fir (Pseudotsuga menziesii), that reduces growth in native stands and exotic plantations worldwide. An outbreak of SNC began in coastal Oregon in the mid-1990s and has persisted since that time. Here we review the current state of knowledge after 24 years of research and monitoring, with a focus on Oregon, although the disease is significant in coastal Washington and has recently emerged in southwestern British Columbia. We present new insights into SNC distribution, landscape patterns, disease epidemiology and ecology, host-pathogen interactions, trophic and hydrologic influences, and the challenges of Douglas-fir plantation management in the presence of the disease. In Oregon, the SNC outbreak has remained geographically contained but has intensified. Finally, we consider the implications of climate change and other recently emerged foliage diseases on the future of Douglas-fir plantation management. Study Implications: Douglas-fir tree growers need to consider Swiss needle cast (SNC) and other emerging foliage diseases as SNC has not abated over the past 24 years, and along with other emerging diseases, it continues to pose a threat to Douglas-fir plantation productivity. Douglas-fir management in western Oregon remains important, such that a knowledge of disease impacts and effective silvicultural responses is key. Managers should carefully consider whether alternative species may be ecologically or economically beneficial in some situations while tree improvement programs must continue to breed for tolerance to SNC. Research shows that regional scale foliage disease outbreaks can result in trophic cascades and hydrologic changes that affects more than just the trees. The environmental controls on the SNC epidemic imply that climate change could strongly influence future directions of the outbreak, with the greatest threats to trees at higher elevations.

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Section: Hydrologic and Trophic Interactionsmentioning

confidence: 99%

Persistence of the Swiss Needle Cast Outbreak in Oregon Coastal Douglas-Fir and New Insights from Research and Monitoring

Shaw

Ritóková

Lan

et al. 2021

Journal of Forestry

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“…Interactions between Swiss needle cast and other biotic disturbance agents have not been well-studied. A single study proposed a negative effect of Swiss needle cast on Douglas-fir beetle susceptibility (Kelsey and Manter 2004), discussed in further detail below.…”

Section: Swiss Needle Castmentioning

confidence: 99%

“…However, not all stresses produce physiological responses that attract Douglas-fir beetles. Swiss needle cast-infected trees produce less ethanol as disease severity increases due to carbon starvation, thereby making them less attractive to Douglas-fir beetle (Kelsey and Manter 2004). However, when Swiss needle cast-infected trees are attacked, those attacks are likely to be successful due to lowered oleoresin defense systems, another symptom of carbon starvation.…”

Section: Douglas-fir Beetlementioning

confidence: 99%

“…In addition to the lack of host nutrition due to disease, plantation-aged trees are not ideal for Douglas-fir beetle brood development given their relatively small size (Shaw et al 2009). However, if another disturbance, such as a windthrow event or episodic drought, causes tree stress or mortality, Swiss needle castaffected forests could potentially be susceptible to a Douglas-fir beetle outbreak (Kelsey and Manter 2004).…”

Section: Douglas-fir Beetlementioning

confidence: 99%

“…However, host susceptibility and attractiveness is negatively influenced by severe Swiss needle cast (Kelsey and Manter 2004), so in severely diseased stands, Douglas-fir beetle may not be able to react to typical climate drivers.…”

Section: Interacting Effects With Climate Changementioning

confidence: 99%

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Interactions of predominant insects and diseases with climate change in Douglas-fir forests of western Oregon and Washington, U.S.A.

Agne

Beedlow

Shaw

et al. 2018

Forest Ecology and Management

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Forest disturbance regimes are beginning to show evidence of climate-mediated changes, such as increasing severity of droughts and insect outbreaks. We review the major insects and pathogens affecting the disturbance regime for coastal Douglas-fir forests in western Oregon and Washington State, USA, and ask how future climate changes may influence their role in disturbance ecology. Although the physiological constraints of light, temperature, and moisture largely control tree growth, episodic and chronic disturbances interacting with biological factors have substantial impacts on the structure and functioning of forest ecosystems in this region. Understanding insect and disease interactions is critical to predicting forest response to climate change and the consequences for ecosystem services, such as timber, clean water, fish and wildlife. We focused on future predictions for warmer wetter winters, hotter drier summers, and elevated atmospheric CO to hypothesize the response of Douglas-fir forests to the major insects and diseases influencing this forest type: Douglas-fir beetle, Swiss needle cast, black stain root disease, and laminated root rot. We hypothesize that 1) Douglas-fir beetle and black stain root disease could become more prevalent with increasing, fire, temperature stress, and moisture stress, 2) future impacts of Swiss needle cast are difficult to predict due to uncertainties in May-July leaf wetness, but warmer winters could contribute to intensification at higher elevations, and 3) laminated root rot will be influenced primarily by forest management, rather than climatic change. Furthermore, these biotic disturbance agents interact in complex ways that are poorly understood. Consequently, to inform management decisions, insect and disease influences on disturbance regimes must be characterized specifically by forest type and region in order to accurately capture these interactions in light of future climate-mediated changes.

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Global review on interactions between insect pests and other forest disturbances

et al. 2021

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Effect of Swiss needle cast on Douglas-fir stem ethanol and monoterpene concentrations, oleoresin flow, and host selection by the Douglas-fir beetle

Cited by 8 publications

References 45 publications

Persistence of the Swiss Needle Cast Outbreak in Oregon Coastal Douglas-Fir and New Insights from Research and Monitoring

Persistence of the Swiss Needle Cast Outbreak in Oregon Coastal Douglas-Fir and New Insights from Research and Monitoring

Interactions of predominant insects and diseases with climate change in Douglas-fir forests of western Oregon and Washington, U.S.A.

Global review on interactions between insect pests and other forest disturbances

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