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Aerial Spraying Program Against the Gypsy Moth

Problem Addressed: Gypsy moth (Lymantria dispar)

Key Findings: The biological repression program was a total success. The residual egg mass populations are significant as to the result of the spraying. No control program will be carried out in 1980 in Quebec.

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Aerial Spraying Against the Spruce Budworm in Quebec in 1975 and Plans for 1976

Problem Addressed: Spruce Budworm infestation has spread so much in Quebec in the last two years that it is no longer possible to spray all the balsam and spruce stands that would need to be treated

Key Findings: Results of sprayings are satisfactory, considering the fact that the Spruce Budworm larvae have reached in 1975 population levels that had ever been recorded in the previous infestation

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1980 Maine Spruce Budworm Suppression Project: 1980 Conditions and Project Efficacy

Problem Addressed: Maine spruce budworm suppression project

Key Findings: Spray efficacy in terms of survival, adjusted mortality, unadjusted mortality, and defoliation was determined for each treatment variation and area.

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Applying a Spruce Budworm Decision Support System to Maine: Projecting Spruce-Fir Volume Impacts under Alternative Management and Outbreak Scenarios

Problem Addressed: Spruce Budworm

Goal(s)/Objective(s): Implement the Spruce Budworm Decision Support System

Key Findings: Statewide analysis suggested that over 4 million ha of Maine's forest are vulnerable to the budworm.

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Long-term spatial and structural dynamics in Acadian mixedwood stands managed under various silvicultural systems

Problem Addressed: Differences in spatial pattern, species mingling, height differentiation, and relative stand complexity index (rSCI).

Goal(s)/Objective(s): To determine differences in spatial pattern, species mingling, height differentiation, and relative stand complexity index (rSCI) due to five treatments: commercial clear-cutting, fixed diameter-limit, 5 year single-tree selection, three-stage shelterwood (both with and without precommercial thinning), and unharvested natural areas.

Key Findings: Precommercial thinning in a shelterwood treated stand generally increased species mingling, height differentiation, and rSCI. Two untreated natural areas exhibited divergent pathways of structural development. Dynamics in uneven-aged selection treatments more closely resembled that of the untreated natural areas than did the shelterwood, commercial clearcut, or fixed diameter-limit treatments.

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Nutrient Concentration of Down Woody Debris in Mixedwood Forests in Central Maine, USA

Problem Addressed: Nutrient concentrations pre- and post-harvest pool sizes across down woody debris decay.

Goal(s)/Objective(s): To determine the nutrient concentrations

Key Findings: Softwoods generally had lower nutrient concentrations and higher C:N-ratios than hardwoods; N:P-ratios did not differ between hardwoods and softwoods.

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Influence of harvest gaps and coarse woody material on click beetles (Coleoptera: Elateridae) in Maine’s Acadian forest

Goal(s)/Objective(s): To examine how the species richness, abundance, diversity, and assemblage of similarity of click beetles inhabiting coarse woody material were affected by harvesting and coarse woody material characteristics.

Key Findings: Small (less than 0.2 ha) harvest gaps with living trees retained throughout the gap can maintain click beetle assemblages similar to that of an unharvested forest.

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The role of herbicides for enhancing forest productivity and conserving land for biodiversity in North America

Problem Addressed: Do herbicides increase forest productivity, and are they compatible with the objectives of wildlife management and biodiversity conservations?

Key Findings: If herbicides are properly used, current research indicates that the negative effects on wildlife are usually short-term and that herbicides can be used to meet wildlife habitat objectives.

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Benchmarking and Calibration of Forest Vegetation Simulator Individual Tree Attribute Predictions Across the Northeastern United States

Goal(s)/Objective(s): Benchmark and calibrate three submodels of the Forest Vegetation Simulator-Northeast variant (FVS-NE).

Key Findings: An assessment of overall model performance should be conducted if calibrated submodels are used and alternative modeling strategies be explored to better represent the allometry and growth of the important trees species across the northeastern United States.

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