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Full-Text Articles in Life Sciences
Tb130: Sequential Sampling In Surveys Of Overwintering Larvae Of Spruce Budworm, Choristoneuera Fumiferana (Lepidoptera: Tortricidae), J. B. Dimond, Henry Trial Jr.
Tb130: Sequential Sampling In Surveys Of Overwintering Larvae Of Spruce Budworm, Choristoneuera Fumiferana (Lepidoptera: Tortricidae), J. B. Dimond, Henry Trial Jr.
Technical Bulletins
A sequential sampling system for classifying infestation levels of overwintering larvae of the spruce budworm, Choristoneura fumiferana, (Clemens), is described. Sequential tables for critical densities of larvae on balsam fir and red spruce are presented for 70%, 80%, and 90%, confidence intervals. The system is based on data collected in Maine and uses a maximum of 6 branches, 3 from fir and 3 from spruce. Simulations illustrating error rates and effort saved using the system are discussed.
Patterns Of Tree Mortality During An Uncontrolled Spruce Budworm Outbreak In Baxter State Park, 1983, Akira Osawa, Charles J. Spies Iii, John B. Dimond
Patterns Of Tree Mortality During An Uncontrolled Spruce Budworm Outbreak In Baxter State Park, 1983, Akira Osawa, Charles J. Spies Iii, John B. Dimond
Technical Bulletins
A forest inventory of Baxter State Park, Maine, was done during the summer and fall of 1983 to study the patterns of mortality in balsam fir and in the red-black spruce complex during an uncontrolled spruce budworm outbreak. The volume of trees that died during the outbreak was estimated at 40% of the original quantity. Fir mortality was consistently greater than that of spruce. The percentage mortality of spruce was always greater in the higher elevation zone than in the lower elevation zone. Percentage mortality of fir and spruce showed inconsistent patterns in relation to the proportion of hardwood species …
Tb113: A Field Test Of Mating-Suppression Using The Spruce Budworm Sex Pheromone, J. B. Dimond, D. G. Mott, W. P. Kemp, J. H. Krall
Tb113: A Field Test Of Mating-Suppression Using The Spruce Budworm Sex Pheromone, J. B. Dimond, D. G. Mott, W. P. Kemp, J. H. Krall
Technical Bulletins
Spruce budworm sex pheromone was dispersed from aircraft over forest land in Maine in late June, 1980. A major goal was to sample pheromone concentrations in air to determine whether the formulation would provide the steady, sustained release of chemical believed required for interfering with the mating process of the moths. Since pheromone was going to be applied for purposes of analyses of air, we believed we should also study some behavioral effects on spruce budworm populations. The principal body of data involved the ability of male budworm moths to orient to point sources of pheromone in pheromone-treated and untreated …
Tb107: Effects Of Some Naturally Occurring Chemicals And Extracts Of Non-Host Plants On Feeding By Spruce Budworm Larvae (Choristoneura Fumiferana), M. D. Bentley, D. E. Leonard, S. Leach, E. Reynolds
Tb107: Effects Of Some Naturally Occurring Chemicals And Extracts Of Non-Host Plants On Feeding By Spruce Budworm Larvae (Choristoneura Fumiferana), M. D. Bentley, D. E. Leonard, S. Leach, E. Reynolds
Technical Bulletins
The authors of this report describe a new laboratory feeding bioassay and its application to the investigation of the effect of a large number of plant extracts and various natural products on feeding by sixth stage spruce budworms.