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

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foliar assimilation and loss rates for Douglas fir (Pseudotsuga menziesii) in thinning/fertilizer
trials in British Columbia.
530. Sandquist, R.E., D.L. Overhulser and J.D. Stein. 1993. Aerial applications of esfenvalerate to
suppress Contarinia oregonensis (Diptera: Cecidomyiidae) and Megastigmus spermotrophus
(Hymenoptera: Torymidae) in Douglas-fir seed orchards. Journal-of-Economic-Entomology
86(2): 470-474.
Keywords: seed orchard management
tree/stand protection
stand conditions
Abstract: Aerial application of esfenvalerate significantly reduced populations of
Contarinia oregonensis and Megastigmus spermotrophus in mature seed orchards of Pseudotsuga
menziesii in Oregon. Populations of Oligonychus ununguis increased significantly in treated
areas. The results demonstrated that aerial applications can be made under conditions in the
Pacific Northwest and can reduce insect damage levels with between 10 to 20-times less
insecticide than when high-volume orchard sprayers are used.
531. Scagel, C.F., R.G. Linderman and R.K. Scagel. 2000. Ten-year growth and survival of Douglasfir
seedlings treated with plant growth regulating substances at transplant. Canadian-Journal-of-
Forest-Research 30(11): 1778-1787.
Keywords: nursery operations
growth
tree/stand health
tree morphology
Abstract: Commercially available plant growth regulators (PGRs) or moisture retention
gels, applied to the roots of Douglas fir (Pseudotsuga menziesii) before planting, can modify IAA
levels in roots, root growth responses, and tree survival. Two different 1+0 stock types (PSB313B
and PSB323, interior and coastal Douglas fir, respectively, the latter having a larger root mass)
were treated with IBA, ethephon (Ethrel), alginate, or a combination of IBA and alginate. New
root growth and IAA levels in roots were measured 2 weeks after planting, and aboveground
growth and tree survival were monitored over 10 growing seasons after planting in May 1988 on
a site clear felled in winter 1988 in British Columbia, Canada; no site preparation was carried out.
Treatment with IBA or the combination of IBA and alginate increased IAA conjugate and free
IAA levels in roots, root growth, and tree survival. Alginate treatment alone increased new root
growth and tree survival, but did not increase free IAA levels in roots. Ethephon treatment
increased free IAA levels and root growth, but had no effect on IAA conjugates or tree survival.
A cost analysis suggested that use of certain PGRs or alginate decreased the cost required to
attain target stocking and increased tree size. The results suggest that application of PGRs or
other root-promoting materials to the roots of Douglas fir before planting has the potential to be a
cost-beneficial method for increasing root growth and tree survival.
532. Schermann, N., W.T. Adams, S.N. Aitken and J.C. Bastien. 1997. Genetic parameters of stem
form traits in a 9-year-old coastal Douglas-fir progeny test in Washington. Silvae-Genetica
46(2/3): 166-170.
Keywords: genetic tree improvement
growth