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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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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)

  • Provenances in the Bulkley #228 Seed Orchard (red dots)

  • Approx. location of the Bulkley Seed Planning Zone (red hatched outline)

Bulkley SPZ


Western Gall Rust - Stem Infection


Pine Needle Cast

  • Causal Organism:

    • Lophodermella concolor (teleomorph or sexual stage)


Dothistroma Needle Blight (aka Red Band Needle Blight)

  • Causal Organism:

    • Dothistroma septospora (anamorph or asexual stage)

    • Mycosphaerella pini (teleomorph or sexual stage)


Elytroderma Needle Cast

  • Causal Organism:

    • Elytroderma deformans (Weir) Darker


Elytroderma deformans

  • Stem infections

    • Sunken, often spiral shaped

    • Dark, cracked & slightly resinous bark


Elytroderma deformans

infected wood

15

10

5

canker initiation

normal wood


Elytroderma deformans

  • Foliar retention (squares)

  • Spatial distribution of stem and branch infections is relatively uniform across the site (circles)


Effect of Latitude on Elytroderma

  • Slight trend toward increased susceptibility in southern provenances


Foliar Disease Susceptibility

  • Considerable range of susceptibility among the 40 clones

  • Lots of opportunity to selectively improve resistance through rouging (oval)


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?


Western Gall Rust

Severity of infection

3 Most Resistant & 3 Least- Resistant Clones


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


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


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


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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