Popular Dynamics of the Major North American Needle Eating Budworms
Goal(s)/Objective(s): Produce projection capabilities for defoliation and successive budworm densities (eggs, nominal fourth instars, emerging moths, and egg masses) as functions of preceding density, site and stand attributes, interstand influences, systematic year-to-year changes in survival, recent insecticide treatment, and weather.
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- Campbell, Robert W.
Research Entomologist, Pacific Northwest Research Station
Data from six western states provided 1251 life tables representing spruce budworm, Choristoneura occidengtalis 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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