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Proceedings of the Sixth International Workshop on the Genetics of Host-Parasite Interactions in Forestry—Tree Resistance to Insects and Diseases: Putting Promise into Practice


Richard A. Sniezko



Publication type:

General Technical Report (GTR)

Primary Station(s):

Southern Research Station


General Technical Report SRS-252. Asheville, NC: U.S. Department of Agriculture Forest Service, Southern Research Station.


The Sixth International Workshop on the Genetics of Host-Parasite Interactions in Forestry: Tree Resistance: Putting Promise into Practice was held the first week of August 2018 at Deer Creek State Park in Mt. Sterling, Ohio. The workshop provided a continuing conduit for bringing together researchers, tree breeders, and forest managers to focus on perhaps the most salient action society can take to restore tree species imperiled by invasive pests and pathogens—developing and deploying resistant tree populations. The 95 presentations (oral and poster) covered a wide range of tree species and associated pathogens and pests from throughout the world. Ash species (genus Fraxinus) throughout Europe and North America face relatively new perils (ash dieback disease and emerald ash borer) and a special session was devoted to this genus. Screening for resistance is a fundamental component of resistance development and the topic of another full session. Additional presentations detailed efforts to develop genomics and biotechnology tools and resources that have the potential to increase the efficiencies of applied resistance programs. Other presentations provided inputs on collaborative breeding approaches, citizen science in forest health, the potential role of endophytes in managed forests, threats to agroforestry species, prioritization of species in need of resistance programs, considerations necessary for the use of new biotechnologies, and concepts for integrating genetic, phenotypic and environmental data across the host-parasite system. Several presentations provided updates on “the ultimate goal”—progress of applied resistance programs and actual restoration efforts—leading into discussions on key topics such as the durability, stability, and usability of resistance in forest tree species. Taken together the presentations and discussions provided ample evidence that developing resistant populations is a viable (and in some cases necessary) approach for society to use to ensure healthy forests for future generations. These proceedings document the presentations given as lightly reviewed full papers, extended abstracts, and standard abstracts. In concluding the workshop, the attendees approved Spain by acclamation as the host of the Seventh Tree Resistance Workshop to be held in 2020.

A Short History of Tree Resistance Selection and Breeding Through the Journal Forest Pathology
Screening for Resistance Against Insect Herbivores Using Chemical and Anatomical Defenses in Lodgepole Pine and White Spruce
Adult Host Selection Trials for Spruce Budworm Resistance in Douglas-Fir: a Cautionary Tale
Screening for Genetic Resistance to the Hemlock Woolly Adelgid
A Collaborative Multi-Agency Program to Develop Resistance to Beech Bark Disease in American Beech (Fagus Grandifolia)
Phoenix from the Ashes: Exploiting Host Resistance to Conserve and Restore Populations of European Ash
Restoring Green Ash (Fraxinus pennsylvanica): Breeding for Resistance to the Emerald Ash Borer (Agrilus planipennis)
Evaluation of Resistance of Asian and European Ash Species and Cultivars to Emerald Ash Borer (Agrilus Planipennis)
The Past Is Prologue: Understanding the Current State of Tree Improvement in the United States
Variation and Genomic Basis of Fraxinus excelsior (Common Ash) Susceptibility to Hymenoscyphus fraxineus (Ash Dieback) Throughout Britain
Progress of an Applied Disease Screening and Selection Program for Resistance to Vascular Wilt in Hawaiian Acacia Koa
The Development of a Resistance Screening Program of Ohia to Ceratocystis Pathogens Causing Widespread Mortality on Hawaii Island
Screening Range-Wide Black Walnut Seed Families for Thousand Cankers Disease (TCD) Resistance and Measuring the Regional Adaptability of Resistant Seed Sources
The search for resistance in Lodgepole Pine to Comandra Blister Rust in the Central Interior of British Columbia
Genetic resistance to Phytophthora Lateralis in Port-Orford-Cedar (Chamaecyapris Lawsoniana)
Genetic Diversity in the Laurel Wilt Pathogen, Raffaelea Lauricola, and the Consequences for Resistance Breeding
Fusiform rust resistance in an elite population of loblolly pine population
Genetic parameter estimates for usiform rust disease from a multi-environment trial of Loblolly Pine (Pinus taeda L.)
USDA advances in plant breeding and innovation: resistance breeding, germplasm collections, and genetic diversity
Genomics of Fraxinus (Oleaceae): a Genus Under Severe Threat
Expression profiling of candidate genes of resistance to phytophthora cinnamomi determined in different genotypes of castanea spp
Exploiting natural variation in a tree species to combat an invasive forest pathogen
Genome-Wide Exon-Capture Approach Identifies Genetic variants associated with susceptibility of norway spruce trees to heterobasidion parviporum infection
Metabolomic comparison of european ash genotypes with different tolerance levels against ash dieback
Candidate genes from Gwas and Rnaseq for Beech Bark Disease resistance in American Beech
Factors underpinning resistance against the galling pest, Leptocybe Invasa in Eucalyptus Grandis
Identification of genes involved in the resistance response of pinus pinaster to the Pinewood Nematode Infection
Identifying and validating necrotrophic effectors in the Populus Trichocarpa-Sphaerulina Musiva Pathosystem
Host-Pathogen interaction in leaves of Laurel Wilt Hosts
Resistance to Heterobasidion annosum S.L
Development and application of high density genetic map of limber pine (Pinus Flexilis James) for genomics-based breeding
Genetic mapping and unctional genomics analyses of the resistance/ susceptible response in chestnut seedlings to Phytophthora Cinnamomi Infection
Multiple approaches to dissect fusiform rust resistance in Pinus taeda L.
The potential for biotechnology to address forest health
Restoration of American Chestnut: a marriage of breeding and biotechnology
New Frontiers in Forestry: Combining Phenomics, Common Gardens, and Landscape Genomics to Address Disease Resistance and Climate Change
Wise use of genomics in improving forest health
Virulence of Sphaerulina musiva isolates determined by genome-wide association mapping, host infection, and colonization
Early screening potentially blight-resistant American Chestnut using small stem assays
Defense responses of Austrian Pine to two opportunistic pathogens of contrasting aggressiveness under combined drought and temperature stress
Are novel plant chemicals friends or foes of native invasive insect herbivores? Explaining successful host range expansion of mountain pine beetle in Canada’s Boreal Forests
Volatiles Released by Pinus Pinaster Half-Sib Genetically Contrasting Families for Pine Wilt Disease Susceptibility Before and During Monochamus Galloprovincialis Insect-Vector Feeding
Hemlock and Hemlock Woolly Adelgid: Past Research, Current Findings, and Future Directions in a Troubled North American Tree-Pest System
A hint left by mountain pine beetle on anatomical defenses of lodgepole pine trees: Larger Resin Ducts Enhance tree resistance
Variation across populations in resistance to a key herbivore and its relationship with constitutive and induced secondary metabolites in a Mediterranean pine tree
Better forest health through tree resistance-collaborative approaches
Treegenes: Integrating genotypic, environmental, and phenotypic data for forest health
A national prioritization of United States tree species threatened by Insect and disease infestation
Searching, downloading and analyzing tree genetic and genomic data with the hardwood genomics website
Durability of resistance and “Useful Resistance” in Forest Trees to non-native pathogens
Treesnap: a citizen science project and mobile app to tag trees for science
Development of a tool for rapid identification of resistant trees in species affected by alien invasive pathogens
Detection of near infrared spectral differences in pinus radiata
Endophyte enhancement of spruce and eastern white pine seedlings to improve tolerance to insects and disease
Monitoring of Ash Mortality Patterns Informs Emerald Ash Borer (EAB) Resistance Breeding Efforts: Integrated Pest Management for EAB
Emerging threats of priority agroforestry trees in Africa: Challenges and opportunities
The effect of site quality on performance of American Chestnut (Castanea dentata) seedlings bred for blight (Cryphonectria parasitica) resistance
Drivers of disease emergence in Boreal Conifer Forests, importance of phenotypic balance
Intraspecific genetic variation in defensive investment of a model Mediterranean Pine: a dendroecological analysis of resin ducts
An Answer Awaiting a Question: The United Kingdom National Tree Seed Project Collections
Genotypic Diversity and Reproductive Biology of Thekopsora Areolata, the Causal Agent of Cherry Spruce Rust in Norway Spruce Seed Orchards
An Improved Chinese Chestnut Genome
Advanced Phenotyping Using Ft-Ir Distinguishes Disease Resistance in Fraxinus Excelsior Against Hymenoscyphus Fraxineus
Delphi Expert Opinion Survey to Assess Threats to Oaks in the Eastern United States
Treesnap: a Citizen Science App Connecting Tree Enthusiasts and Forest Scientists
Phytophthora famorum in Larch: from Epidemiology to Host Resistance
Geographic and Local Genetic Variation in Pacific Madrone Leaf Blight
Back from the Brink: Forest Service Efforts to Create Dutch Elm Disease Tolerant Trees for Use in Urban and Rural Restoration
Field Performance of Previously Selected Root Rot Tolerant Tropical Acacias
Building a Ceratocystis Resistance Program for Metrosideros in Hawaii
The Imminent Invasion of the Emerald Ash Borer in Southern Europe and the Threat to Native Oleaceae
A Collaborative Research Approach for Diagnosing and Evaluating Thousand Cankers Disease in Walnut: Current Progress and Future Directions
Collaborative Research for Sustainable Management of Southwestern White Pine
Butternut Conservation and Breeding to Mitigate Butternut Canker Disease
Die Back Syndrome Caused by Lasiodiplodia Theobromae and Fusarium Proliferatum in Elite Genotypes of Tectona Grandis Lf., Costa Rica
Somatic Embryogenesis and Cryostorage for Restoration of Ash Forests Devastated by Emerald Ash Borer
Qtl Mapping of Sphaerulina Musiva Canker Resistance/Susceptibility in a Poplar T X D Hybrid Population
The Resistance of Mulberry Tree Species to Two Foliar Diseases in the Rainforest Ecological Zone of Nigeria
Nursery Pest Resistance of Mansonia Altissima Seedlings to Godasa Sidae Attack in the Rainforest Ecological Zone of Nigeria
Qtl Mapping Population Development in Cornus Florida Using Open Pollinated Seedlings and Ssr Markers
Genetic Barcodes for Identification of Pure and Hybrid Fraxinus Species
Confocal Microscopy Confirms the Feasibility of Gene Silencing for Emerald Ash Borer Suppression
Various propagation ways in Alnus glutinosa with different sensitivity to Phytophthora × Alni
Using a Poplar Hybrid to Explore Host Plant Genetic Control of Associating Insect and Fungal Species
Genetic Resistance to Blister Rust in Declining Limber Pine (Pinus flexilis) in Alberta—The Path to Restoration? In: Nelson, C
Genetic Resistance and Restoring a Threatened Species: Whitebark Pine at Crater Lake National Park
Investigating Anatagonistic Activity of Fungal Endophytes Toward Pathogens of Western White Pine (Pinus monticola)
Sudden Oak Death in Southern Oregon: Comparing the Eu1 and Na1 Lineages of Phytophthora ramorum
Screening for White Pine Blister Rust in Whitebark Pine: British Columbia, Canada
Differential Resistance to Phytophthora Cinnamomi in Trojan Fir
Phenolic Component of Loblolly Pine Defense Response to Blue-Stain Fungi Associated with Root-Feeding Beetles
Breeding for Resistance to Pathogenic Pine Wood Nematodes
Variations in Susceptibility to Dothistroma Needle Blight and Pine Pitch Canker Scottish Populations of Scots Pine
Breeding and Deployment of Insect and Disease Resistance Trees in British Columbia: a 2018 Update
Restoration After the Laurel Wilt Disease Epidemic
The Effects of Leaf Wax Composition and Ratio on Rust Resistance of Poplars


Nelson, C. Dana; Koch, Jennifer L.; Sniezko, Richard A., eds. 2020. Proceedings of the Sixth International Workshop on the Genetics of Host-Parasite Interactions in Forestry—Tree Resistance to Insects and Diseases: Putting Promise into Practice. Gen. Tech. Rep. SRS–252. Asheville, NC: U.S. Department of Agriculture Forest Service, Southern Research Station. 170 p.

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