Tree Improvement Program Project Report 2006 / 2007

mountains demonstrated superior growth. On average,
the Submaritime provenances were 14 percent taller than
sources from the Interior Cedar Hemlock zone. Mean tree
volume of the Skykomish provenance was 32 percent larger
than Salmon Arm, the largest interior provenance. Sources
from the south-western US survived poorly and grew
1
F gure 9. Armillaria fru t ng bod es
on art fic ally noculated Inter or
Douglas-fir test seedl ng. Fungus was
transm tted to the root ng med um
through the noculated paper b rch
block seen n background.
F gure 11. Forward select ons n the D’Arcy provenance
n the Tr n ty Valley range-w de provenance test.
T R E E I M P R O V E M E N T P R O G R A M
P R O J E C T R E P O R T 2 0 0 6 / 2 0 0 7
slowly (Figure 10), while trees from the two Mexican sources
have all died. Forward selections were made with the best
Submaritime provenances (Figure 11). Pollen was collected
from these selections to include these trees in the secondgeneration
Interior Douglas-fir crossing program (Figure 12).
F gure10. Th rty-year-old Ar zona provenance show ng extreme
maladaptat on to the Tr n ty Valley s te.
F gure 12. P ck ng pollen from forward selected trees n the
Tr n ty Valley range-w de provenance test. Pollen w ll be
used n Inter or Douglas-fir second-generat on cross ng.