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Full-Text Articles in Forest Sciences
Population Ecology Of Spruce-Fir Forests Of The Interior West, Katheryn Little
Population Ecology Of Spruce-Fir Forests Of The Interior West, Katheryn Little
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Spruce-fir forest type covers nearly 10 million acres of forested land in the interior west, but there is a lack of research defining how these forests grow for future planning. Stand density index (SDI) represents the average tree size and number of trees in a stand multiplied. Each species has specific maximum number the growing space can handle known as ‘fully stocked’. If the stand is fully stocked, it must wait until trees die for individuals to grow. Spruce and fir have similar maximum stocking values, and similar growth characteristics, allowing them to be plotted together. Using current forest data, …
Effectiveness Of Carbaryl And Pyrethroid Insecticides For Protection Of Engelmann Spruce From Attack By Spruce Beetle (Coleoptera: Scolytidae), Karen J. Johnson
Effectiveness Of Carbaryl And Pyrethroid Insecticides For Protection Of Engelmann Spruce From Attack By Spruce Beetle (Coleoptera: Scolytidae), Karen J. Johnson
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
A field experiment tested the effectiveness of carbaryl and two pyrethroid insecticides, cyfluthrin and esfenvalerate, in protecting high-value Engelmann spruce trees from attack by Dendroctonus rufipennis Kirby. Carbaryl suspension at the 2% registered rate and a reduced rate of 1 % were both effective in protecting Engelmann spruce from attack by D. rufipennis through two pheromone baiting periods and 24 months following insecticide application. Cyfluthrin at 0.025% rate and esfenvalerate at 0.025 and 0.05% rates provided effective protection through one pheromone baiting and 12 months following insecticide application. Only cyfluthrin at 0.008% rate was judged ineffective protection 12 months following …