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Publication Information
Title:
| Population dynamics of the major North American needle-eating budworms. |
Author(s): |
Campbell, Robert W. |
Date: |
1993 |
Source: |
Res. Pap. PNW-RP-463. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 242 p |
Station ID: |
RP-PNW-463 |
Description: |
Data from six western States provided 1,251 life tables representing western spruce budworm, Chodstoneura 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. |
Keywords: |
Western spruce budworm, eastern spruce budworm, jack pine budworm, life table, population dynamics, survival, site and stand attributes, interstand influences, year-to-year changes, insecticide treatment, weather, Choristoneura, predators, birds, ants, density dependence, host defenses, hazard rating |
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Citation
Campbell, Robert W. 1993. Population dynamics of the major North American needle-eating budworms.. Res. Pap. PNW-RP-463. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 242 p
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