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(Pseudotsuga menziesii). The coreids were exposed to diatomaceous earth [diatomite], and sprays
of 0.1 and 1.0% Lagon 2E (dimethoate) and 0.1 and 0.01% Ambush 50 EC (permethrin) in both
laboratory and field tests and to 0.1% malathion in the laboratory. In field tests, permethrin and
dimethoate caused significant mortality for 2 weeks after sprays were applied and permethrin
continued to be effective for a 3rd week. Diatomite was not effective in the field tests or in 1 of 2
laboratory tests. Malathion, dimethoate and permethrin caused significant mortality in both
laboratory tests.
598. Tait, D.E. 1988. The dynamics of stand development: a general stand model applied to Douglasfir.
Canadian-Journal-of-Forest-Research 18(6): 696-702.
Keywords: planting operations
thinning
growth
tree/stand health
Abstract: A linked pair of hypotheses are developed that represent causal explanations for
plant growth and stand mortality for an even-aged stand. The pair of dynamic equations lead to a
four-parameter Douglas fir simulation model that relates the development of stand volume and
density to site quality, initial stocking density and alternative thinning regimes. The mortality
hypothesis, a dynamic hypothesis related to stand density and stand growth, generates the -
superscript 3/2 power law as an equilibrium solution.
599. Tanaka, Y., B. Carrier, A. Dobkowski, P. Figueroa and R. Meade. 1988. Field performance of
mini-plug transplants. Rocky-Mountain-Forest-and-Range-Experiment-Station,-USDA-Forest-
Service General-Technical-Report RM-GTR-167. 172-181 pp.
Keywords: nursery operations
tree/stand health
growth
Abstract: Mini-plug transplants (MPTs) are grown for 5-6 months in the greenhouse under
extended daylength and are transplanted by machine into nursery beds in May when the plants are
4-5 inches tall. Seedlings are grown for one season before planting. Field performance of MPTs
was compared with that of other stock types of Douglas fir [Pseudotsuga menziesii] in 6 regions
of Washington and Oregon. Based on survival, vigour and height growth, MPTs generally
performed as well as or better than other bare rooted stock. Because of their smaller initial height,
MPTs had less total height than other stock types after 3 yr. MPTs were not preferred over other
stock types in terms of frequency of big-game browsing and rabbit clipping, but, because of their
small size, they were unable to withstand heavy animal damage.
600. Tappeiner, J.C., J.F. Bell and J.D. Brodie. 1982. Response of young Douglas-fir to 16 years of
intensive thinning. Forest-Research-Laboratory,-Oregon-State-University
Keywords: thinning
growth
yield
tree/stand health
economics