| Autor: |
Robison, Daniel J., Abrahamson, Lawrence P., Czapowskyj, Miroslaw M., White, Edwin H., Allen, Douglas C. |
| Zdroj: |
The Canadian Entomologist; April 1985, Vol. 117 Issue: 4 p395-399, 5p |
| Abstrakt: |
AbstractOptimum size of a sample unit and within-branch distribution of overwintering spruce budworm were determined for black spruce in northern Maine. No significant differences in sample reliability were found between whole-branch and 45-cm branch-tip samples. Larval distribution on branches varied with total branch length and a model was developed to estimate the whole-branch population from a 45-cm branch tip. Use of a 45-cm branch-tip sample unit is recommended because it is biologically and statistically valid and reduces sampling costs. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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