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- W3084427604 abstract "Abstract Engelmann spruce, Picea engelmannii Parry ex Engelm. (Pinaceae), in the southern Rocky Mountains is composed of two distinct phloem monoterpene chemotypes that differ in relative abundances of multiple monoterpenes, particularly α-pinene and Δ 3 -carene (hereafter, the “α-pinene chemotype” and the “Δ 3 -carene chemotype”). Here, relative toxicity of these chemotypes is tested on spruce beetle ( Dendroctonus rufipennis Kirby) (Coleoptera: Scolytinae), a phloeophagous herbivore that colonises trees of both types. Synthetic monoterpene blends representing each chemotype were tested across a range of concentrations (0, 10, 50, 100, 200, and 500 µg/L) in the lab, and probability of survival of adult beetles exposed to each blend was modelled using a logit function. Logit curves were solved to determine LC 25 , LC 50 , and LC 75 of each monoterpene blend. On average, probability of beetle survival was lower when exposed to the Δ 3 -carene chemotype than when exposed to the α-pinene chemotype. However, both chemotypes were completely lethal to beetles at concentrations exceeding 100 µg/L. Adult body mass did not affect survival probability. It is concluded that spruce phloem chemotypes may differ in their toxicity to spruce beetles, with potential consequences for patterns of host-tree colonisation by spruce beetle." @default.
- W3084427604 created "2020-09-14" @default.
- W3084427604 creator A5056977797 @default.
- W3084427604 date "2020-09-09" @default.
- W3084427604 modified "2023-09-23" @default.
- W3084427604 title "Toxicity of two Engelmann spruce (Pinaceae) monoterpene chemotypes from the southern Rocky Mountains to North American spruce beetle (Coleoptera: Scolytidae)" @default.
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- W3084427604 doi "https://doi.org/10.4039/tce.2020.49" @default.
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