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October 5, 2025

Technical and Scientific Reports: Cone and Seed Insects of Western White Pine in Northern Idaho: Distribution and Seed Losses in Relation to Stand Density

Key Points

Increased seed losses were associated with higher insect infestations in low-density stands of western white pine.
Analysis over several decades showed that low-density forests had more significant infestations, affecting seed supply.
The observational study focused on infestations in trees, providing vital insights for forest plantation management.
These findings highlight the need for density management to mitigate the impact of insects on seed production.

Abstract

Abstract An adequate seed source is necessary to supply seed for the increasing number of forest plantations being established by public and private agencies in the western United States. Thus, as the demand for forest tree seed has increased, the effects of insects on its production and collection has become of vital concern. Previous examinations of cones from western white pine, Pinus monticola Dougl., plantations indicated flint relatively heavier infestations occur in the low-density stands than in high-density stands (1). The results of a study initiated in 1963 to more fully investigate this relationship are reported here.

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