Stand Parameters Affecting Mortality Factors of Spruce Budworm Eggs and Dispersing Larvae
Problem Addressed: Spruce budworm
Goal(s)/Objective(s): Examine the effects of stand characters on population fluctuations of egg and dispersing first- and second-instar spruce budworm.
Key Findings: Open area and non-host tree densities favorably affected budworm parasites.
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- Kemp, William P.
Michigan State University
A study was conducted in Maine to examine the effects of stand characters on population fluctuations of egg and dispersing first- and second-instar spruce budworm (Choristoneura fumiferana (Clemens)). Data included intensive information on stand density, composition, crown closure, crown surface area, basal area, height, and associated vegetation across a 60 plot continuum. Results of data analyses and computer modelling indicated that open area and non-host tree densities favorably affected budworm parasites Trichogramma minutum (Viereck). Open areas and non-host tree densities were also found to significantly increase mortality of dispersing budworm in the fall and spring dispersal periods.
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