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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
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
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

pine needle cast
Pine Needle Cast
  • Causal Organism:
    • Lophodermella concolor (teleomorph or sexual stage)
dothistroma needle blight aka red band needle blight
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
Elytroderma Needle Cast
  • Causal Organism:
    • Elytroderma deformans (Weir) Darker
elytroderma deformans
Elytroderma deformans
  • Stem infections
    • Sunken, often spiral shaped
    • Dark, cracked & slightly resinous bark
elytroderma deformans1
Elytroderma deformans

infected wood

15

10

5

canker initiation

normal wood

elytroderma deformans2
Elytroderma deformans
  • Foliar retention (squares)
  • Spatial distribution of stem and branch infections is relatively uniform across the site (circles)
effect of latitude on elytroderma
Effect of Latitude on Elytroderma
  • Slight trend toward increased susceptibility in southern provenances
foliar disease susceptibility
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
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?
slide14
Western Gall Rust

Severity of infection

3 Most Resistant & 3 Least- Resistant Clones

resistance proximity to inoculum
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
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
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
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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