Seed spotting with endrin-treated Douglas-fir seed in northwestern California
1961
Roy, Douglass F.
A trial designed to test a formulation of endrin, arasan, asphalt, and aluminum dust as protection for Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) seed against seed-eating rodents produced encouraging results. The seed treatment did not inhibit germination and seemed to provide adequate protection. Although live-trapping proved that rodents were present on the test areas, 83 percent of the seed spots, which were unprotected by screens, and were not destroyed by soil movement, had seed germinate; and 71 percent were stocked at the end of the first growing season. Damage to seed-spots by movement of soil derived from decomposed granite was severe, especially during the first winter. Results suggest that for similar soil types planting may be more efficient than seed -spotting, and that artificial regeneration work should be delayed a year after the last logging disturbance to allow some soil stabilization.
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