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Notes on the Biology of Synetaeris tenuifemur Walley (Hymenoptera: Ichneumonidae)

Goal(s)/Objective(s): Data suggests S. tennifemur is associated with endemic budworm populations

Key Findings: Sufficient data have not been obtained to develop a precise relationship between the number of budworm attacked and budworm density at any one parasite density.

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Prescribed Burning for Stand Conversion in Budworm-killed Balsam Fir: An Ontario Case History

Problem Addressed: Balsam fir mortality from spruce budworm infestations

Key Findings: The Northern Region of OMNR, which has extensive balsam fir morality, burned 1,525 ha in this fuel type in 1983 and plans are in place for an expanded program in future years.

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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.

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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.

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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.

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The Apanteles Species (Hymenoptera: Braconidae) Attacking Lepidoptera in the Micro-Habitat of the Spruce Budworm (Lepidoptera: Tortricidae)

Goal(s)/Objective(s): Six species of Apanteles are described, figured, and keyed.

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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.

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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.

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