Journal Paper (peer reviewed)

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Reduction of Reproductive Potential in Spruce Budworm (Lepidoptera: Tortricidae) by a Chitin-Inhibiting Insect Growth Regulator

Goal(s)/Objective(s): Examine the potential of UC-62644 to reduce the reproductive capabilities of spruce budworm that have been exposed to sublethal concentrations of this chemical during the last larval instar.
Key Findings: The dosages of UC-62644 incorporated into the test diets were sublethal and did not adversely affect larval or pupal survival.
Views: 741
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The timing of Erynia radicans resting spore germination in relation to mycosis of Choristoneura fumiferana

Goal(s)/Objective(s): Analysis of the influence of spore age and temperature on the timing of resting spore germination
Key Findings: Maximum percent germination, within the temperature range that permits germination, decreases as poststorage temperatures increase.
Views: 809
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Do Balsam Twig Aphids (Homoptera: Aphididae) Lower Tree Susceptibility to Spruce Budworm?

Problem Addressed: The balsam twig aphid and the spruce budworm have similar phrenologies and host requirements in eastern North America.
Goal(s)/Objective(s): Report on the negative effects of high twig aphid levels on the survival and developmental rates of spruce budworm on balsam fir.
Key Findings: Spruce budworm per branch clearly decreased as aphid levels increased.
Views: 890
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Aerial Survey Techniques for the Spruce Budworm in the Lake States

Goal(s)/Objective(s): To set up defoliation standards for air observers which could be related to larval population and actual defoliation. Also to determine best flying height, the effect of contrasting filters, and observer accuracy.
Key Findings: Samples collected from the midcrown of codominant or dominant balsam fir trees represent the best estimate of defoliation for the entire tree.
Views: 851
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Sample Size — Precision Relationships for Use in Estimating Stand Characteristics and Spruce Budworm Caused Tree Mortality

Problem Addressed: Spruce Budworm
Goal(s)/Objective(s): Presents sample size -- precision relationships for use in estimating budworm-caused tree mortality, which were derived from data collected over a 5-year period from 25 plots on the Cape Breton Highlands, Nova Scotia.
Key Findings: Results will assist in choosing the type and number of plots required for a specific precision level in future studies determining stand characteristics or budworm-caused tree mortality.
Views: 866
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The Future of Tree Diseases

Problem Addressed: Decimation of trees
Key Findings: Only hope for our trees lies in de-industrialization
Views: 990
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The Epidemiology of the Current Spruce Budworm Outbreak in Quebec

Problem Addressed: Spruce Budworm in Quebec
Key Findings: 1. Make early detection and intervention possible because of the fact that epicenters are restricted to a small portion of the range, thus presenting the possibility of using pheromone traps in small areas to monitor population changes and eventually of exerting control of the epicenters and curtailing the spread of the outbreak. 2. Limit aerial spraying to the zone of occasional abundance and parts of the zone of normal abundance where the duration of the outbreak and the ensuing damage warrant such expenditures.
Views: 939
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Silviculture and the Spruce Budworm in Maine

Problem Addressed: Spruce Budworm
Key Findings: Fir, the primary host of the budworm, is here to stay and while we may reduce its representation in our stands, it will always be sufficient to provide a food source for the budworm; silvicultural practices may reduce the losses from budworm attack, and can reduce the impact of the budworm on our total production by promoting rapid growth in new stands.
Views: 1180
Downloads: 1
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