IntensIve sIlvIculture - Forest Science Labs - Research Network ...

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A 2nd survey in 1987 confirmed the importance of clone and cone crop in attack rate. In this
survey, stressed trees were attacked at a higher rate than unstressed trees. The distribution of P.
orarius appeared clumped in both surveys, possibly because of semiochemicals or oviposition
behaviour.
492. Reddy, M.S., L.M. Funk, D.C. Covert, D.N. He and E.A. Pedersen. 1997. Microbial inoculants
for sustainable forests. Journal-of-Sustainable-Forestry 5(1/2): 293-306.
Keywords: tree/stand protection
tree/stand health
Abstract: A bacterial culture collection of 500 strains was assessed for biological control of
fungal root pathogens and/or plant growth promotion of conifer seedlings. Seven of these strains
showed significant suppressive effects on various soil-borne fungal pathogens. On Douglas fir
[Pseudotsuga menziesii], two strains, Burkholderia cepacia RAL3 and Pseudomonas fluorescens
64-3, reduced disease caused by Fusarium by 7-42% in repeated growth room assays. The same
strains significantly increased the percentage of healthy white spruce [Picea glauca] seedlings
inoculated with Fusarium and Pythium in a conifer nursery, increased the survival of bare-root
white spruce seedlings planted on a reforestation site in Saskatchewan by 19-23%, and increased
new root growth and dry weight of Engelmann spruce [Picea engelmannii] seedlings planted in
Prince George, British Columbia, and white spruce at 4 sites in Saskatchewan and British
Columbia. Strain RAL3 in commercial formulation maintained a viable population of about log
8-9 cfu/ml for over a year when stored at 5 degrees C. Strain survival on seed varied with conifer
species. No decreases in bacterial populations were observed on seeds of jack pine [Pinus
banksiana] or Douglas fir after 37 to 44 days storage at 5 degrees C, but decreases were observed
on seeds of white spruce and Scots pine [Pinus sylvestris].
493. Reeb, D. 1985. Influence of spacing and artificial pruning on the production of clearwood of
Douglas-fir. Forestry-Abstracts 46(10): 640.
Keywords: planting operations
pruning
wood quality
494. Regan, R.P. and W.M. Probesting. 1989. Development of Douglas-fir clones for Christmas trees.
In Combined Proceedings: International Plant Propagators' Society. pp. 187-191.
Keywords: genetic tree improvement
growth
wood quality
Abstract: Douglas fir (Pseudotsuga menziesii var. menziesii) clones have been selected for
vigour and ornamental quality in Christmas tree production in Oregon. Preliminary evaluations in
commercial plots suggest that these clones have significantly higher value than seedlings.
495. Reukema, D.L. and J.H.G. Smith. 1987. Development over 25 years of Douglas-fir, western
hemlock, and western redcedar planted at various spacings on a very good site in British
Columbia. Pacific-Northwest-Research-Station,-USDA-Forest-Service Research-Paper PNW-RP-
381. ii + 46 p.
Keywords: planting operations