Population Dynamics of the Major North American Needle-Eating Budworms (1993)
Problem Addressed: Western Spruce Budworm
Goal(s)/Objective(s): Analyze data from nine projects in six western States to provided 1,251 life tables and to produce projection capabilities for defoliation and successive budworm densities as functions of preceding density, site and stand attributes, interested influences, systematic year-to-year changes in survival, recent insecticide treatment, and weather.
Key Findings: The predator-limitation theory of Hairston and others (1960) is not adequate to explain population limitations in this group of herbivores
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- Campbell, Robert W.
USDA Forest Service
Data from six western States provided 1,251 life tables representing western spruce budworm, Choristoneura occidentalis Freeman. These data provided projection capabilities for defoliation and successive budworm densities, as well as a basis for comparing survival rates among the three principal North American needle-eating budworms (western and eastern spruce budworms, and the jack pine budworm). Several modifications are suggested in current methods for managing budworm-susceptible forests, and suggestions are provided for further studies on the budworm life systems.
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