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Variation in Resistance to Pine Pathogens Bulkley Seed Orchard #228: A Case Study

Variation in Resistance to Pine Pathogens Bulkley Seed Orchard #228: A Case Study. Richard Reich, M.Sc., RPF Regional Forest Pathologist Northern Interior Forest Region (Prince George). Provenance Map. Range of Pl in NA Provenances tested in BC (white dots)

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Variation in Resistance to Pine Pathogens Bulkley Seed Orchard #228: A Case Study

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  1. Variation in Resistance to Pine Pathogens Bulkley Seed Orchard #228: A Case Study Richard Reich, M.Sc., RPF Regional Forest Pathologist Northern Interior Forest Region (Prince George)

  2. Provenance Map • Range of Pl in NA • Provenances tested in BC (white dots) • Provenances in the Bulkley #228 Seed Orchard (red dots) • Approx. location of the Bulkley Seed Planning Zone (red hatched outline) Bulkley SPZ

  3. Western Gall Rust - Stem Infection

  4. Pine Needle Cast • Causal Organism: • Lophodermella concolor (teleomorph or sexual stage)

  5. Dothistroma Needle Blight (aka Red Band Needle Blight) • Causal Organism: • Dothistroma septospora (anamorph or asexual stage) • Mycosphaerella pini (teleomorph or sexual stage)

  6. Elytroderma Needle Cast • Causal Organism: • Elytroderma deformans (Weir) Darker

  7. Elytroderma deformans • Stem infections • Sunken, often spiral shaped • Dark, cracked & slightly resinous bark

  8. Elytroderma deformans infected wood 15 10 5 canker initiation normal wood

  9. Elytroderma deformans • Foliar retention (squares) • Spatial distribution of stem and branch infections is relatively uniform across the site (circles)

  10. Effect of Latitude on Elytroderma • Slight trend toward increased susceptibility in southern provenances

  11. Foliar Disease Susceptibility • Considerable range of susceptibility among the 40 clones • Lots of opportunity to selectively improve resistance through rouging (oval)

  12. Western Gall Rust Susceptibility • Most susceptible clone is >3670 times more susceptible than the most resistant clone • How do you quantify the increase to Breeding Value (BV) achieved by eliminating the highly susceptible clones?

  13. Western Gall Rust Severity of infection 3 Most Resistant & 3 Least- Resistant Clones

  14. Resistance & Proximity to Inoculum • Proximity to highly infected trees does not appear to compromise resistance • 3 “most resistant” clones surrounded by 2 of the “most susceptible” clones • Resistance appears to be durable • this site has experienced numerous “waves” of infection in the past 20 years

  15. Selection for Resistance to More Than One Pathogen • If site is high risk for both gall rust and Elytroderma choice of suitable seedlots is reduced to circled area

  16. PGTIS Lodgepole Pine Seed Orchards FH Assessments Future Work (2008): • Foliar disease re-assessment in 2008 • Evaluate climate station data • Determine climate link to outbreaks • Determine source of variation of common clones in different orchards

  17. Acknowledgments • Biometrics: Wendy Bergerud, Amanda Nemec • Climate Station Support: Vanessa Egginton • Forest Health Technical Support: Deanna Danskin, Ian Patchett • GIS Support: Stafford Shuman • GPS/Survey Engineer Support: Les Higgs • Kalamalka: Mike Carlson, John Murphy, Vicky Berger • PGTIS: Rita Wagner & staff • Students: Jordan Bemmels, Siew Law, Alana Jung, Rebecca Lear, Don Iverson, Andrew Cuthbert

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