bornyl acetate/picea

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Camphor from juvenile white spruce as an antifeedant for snowshoe hares.

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One theory in plant antiherbivore defense predicts that slow growing late succession plants like white spruce (Picea glauca) make large investments in antiherbivore defenses. Juvenile stages of white spruce in the Yukon, Canada, are rarely browsed by snowshoe hares (Lepus americanus), an abundant

Composition, antimicrobial and antioxidant activities of seven essential oils from the North American boreal forest.

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Essential oils (EOs) were steam-extracted from the needles and twigs of balsam fir, black spruce, white spruce, tamarack, jack pine and eastern white cedar that remained after logging in eastern Canada. These EOs, similarly to that from Labrador tea and other commercial EOs from Chinese cinnamon,

Essential oil variability in natural populations of Picea omorika, a rare European conifer.

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This study is the first report on the composition and variability of essential oil in the relic, endemic, and vulnerable tree species Serbian spruce, Picea omorika, in its natural populations. In the needles of 108 trees of four natural populations, 49 components of essential oils were identified.

Methyl Jasmonate-Induced Monoterpenes in Scots Pine and Norway Spruce Tissues Affect Pine Weevil Orientation.

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In large parts of Europe, insecticide-free measures for protecting conifer plants are desired to suppress damage by the pine weevil Hylobius abietis (L.). Treatment with methyl jasmonate (MeJA), a chemical elicitor already used in crop production, may enhance expression of chemical defenses in

UV-B exposure of indoor-grown Picea abies seedlings causes an epigenetic effect and selective emission of terpenes.

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Terpenoids are involved in various defensive functions in plants, especially conifers. Epigenetic mechanisms, for example DNA methylation, can influence plant defence systems. The purpose of the present study was to investigate the influence of UV-B exposure on the release of terpenoids from spruce

Spruce budworm growth, development and food utilization on young and old balsam fir trees.

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Laboratory rearing of spruce budworm, Choristoneura fumiferana, in conjunction with field rearing, gravimetric analyses, a transfer experiment, and foliage chemical analyses at six dates during the period of budworm feeding activity indicated that the age of balsam fir, Abies balsamea, trees

Responses of the western spruce budworm to varying levels of nitrogen and terpenes.

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An agar diet study using western spruce budworm populations from Idaho and New Mexico was carried out to determine the effects of varying concentrations of nitrogen, beta-pinene, and bornyl acetate on larval growth and survival. Increased availability of nitrogen resulted in increased larval growth

Douglas-fir (Pseudotsuga menziesii)-spruce budworm (Choristoneura occidentalis) interactions: the effect of nutrition, chemical defenses, tissue phenology, and tree physical parameters on budworm success.

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Measurements of foliage quality, physiological, and phenological condition of sample trees were used as independent variables in multiple correlation analyses to determine their effect on female and male spruce budworm larval dry weights. Female budworm from trees high in foliar concentrations of

Volatiles released from individual spruce bark beetle entrance holes Quantitative variations during the first week of attack.

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Volatiles released from individual entrance holes of eight spruce bark beetles (Ips typographus) were collected during the first week of attack on a resistant host tree. In order to quantify the release of the highly volatile 2-methyl-3-buten-2-ol (MB) from attacking males, a new method was

Preference of meadow voles (Microtus pennsylvanicus) for conifer seedlings: Chemical components and nutritional quality of bark of damaged and undamaged trees.

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Meadow voles (Microtus pennsylvanicus Ord.) of the 1987-1988 population density peak left several seedling plantations of Norway spruce (Picea abies) and Norway pine (Pinus resinosa) severely damaged in southern Quebec, Canada, while white spruce (Picea glauca) and white pine (Pinus strobus)

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