IntensIve sIlvIculture - Forest Science Labs - Research Network ...
IntensIve sIlvIculture - Forest Science Labs - Research Network ...
IntensIve sIlvIculture - Forest Science Labs - Research Network ...
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growth<br />
tree/stand health<br />
tree morphology<br />
255<br />
Abstract: In a study in Oregon, USA, containerized seedlings of Engelmann spruce (Picea<br />
engelmannii), sugar pine (Pinus lambertiana), Douglas-fir (Pseudotsuga menziesii), western<br />
redcedar (Thuja plicata), and western hemlock (Tsuga heterophylla) transplanted in the early fall<br />
and later in the early spring were compared for differences in stem diameter, height, root area,<br />
and shoot area. Fall-transplanted Pseudotsuga menziesii and the Thuja plicata showed an increase<br />
in stem diameter of 13 (2.0 mm) and 4% (0.4 mm), respectively. Fall-transplanted seedlings<br />
developed larger root systems - Picea engelmannii by 18%, Pinus lambertiana by 48%,<br />
Pseudotsuga menziesii by 58%, and Tsuga heterophylla by 47%.<br />
582. Stelzer, M.J. and R.C. Beckwith. 1988. Comparison of two isolates of Bacillus thuringiensis in a<br />
field test on western spruce budworm (Lepidoptera: Tortricidae). Journal-of-Economic-<br />
Entomology 81(3): 880-886.<br />
Keywords: tree/stand protection<br />
stand conditions<br />
tree/stand health<br />
Abstract: Two isolates of Bacillus thuringiensis (Thuricide 32LV [B. thuringiensis subsp.<br />
thuringiensis] and SAN-415 32LV) were compared for efficacy against Choristoneura<br />
occidentalis on Douglas fir (Pseudotsuga menziesii) and grand fir (Abies grandis) in Oregon. The<br />
insecticides were applied aerially at 20 and 30 billion International Units in a spray volume of 7.1<br />
litres/ha. The 30 BIU/ha dosage provided better population control than 20 BIU/ha dosage with<br />
both formulations; however, only the difference between dosages for the SAN-415 32LV<br />
formulation was significant. Differences in efficacy between the isolates were not significant. The<br />
application of B. thuringiensis improved foliage protection by 15-25% compared with untreated<br />
plots.<br />
583. Stevenson, J.F., B.J. Hawkins and J.H. Woods. 1999. Spring and fall cold hardiness in wild and<br />
selected seed sources of coastal Douglas-fir. Silvae-Genetica 48(1): 29-34.<br />
Keywords: genetic tree improvement<br />
tree/stand protection<br />
tree/stand health<br />
tree phenology<br />
growth<br />
Abstract: Breeding for increased growth in coastal Douglas fir (Pseudotsuga menziesii)<br />
could affect the level of cold hardiness of seedlings used for reforestation. If increased growth is<br />
achieved by initiating growth earlier in the spring or prolonging growth later into autumn, cold<br />
hardiness could be reduced during these seasons. Cold hardiness was measured in top-cross and<br />
first generation seed orchard trees selected for increased growth rates, and wild stand trees on<br />
Vancouver Island and near Mission, BC, throughout one growing season by visual assessment of<br />
artificial freeze tests. Significant differences in freezing damage between genetically selected and<br />
wild stand trees were found during both spring and autumn. In April, LT50 of top-cross trees was<br />
0.7-2.4 degrees C below that of wild stand trees, while in October, LT50 of wild stand trees was<br />
1.9-3.4 degrees C below that of top-cross trees. Mitotic index was investigated as an indicator of<br />
dormancy, and a negative correlation between mitotic index and cold hardiness was found. A
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