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Variation in phenology and monoterpene patterns of defoliated and nondefoliated Douglas-fir (Pseudotsuga menziesii var. glauca).Author(s): Rose-Marie Muzika; Judith Engle; Catherine Parks; Boyd Wickman
Source: Res. Pap. PNW-RP-459. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 10 p
Publication Series: Research Paper (RP)
Station: Pacific Northwest Research Station
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DescriptionFoliage was collected from paired Douglas-fir (Pseudotsuga menziesii var. glauca (Beissn.) Franco) trees characterized as either "resistant" or "susceptible" western spruce budworm (Choristoneura occidentalis Freeman (Lepidoptera: Tortricidae) attack. Resistant trees produced more foliage monoterpenes and broke bud 7 to 10 days earlier than susceptible trees.
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CitationMuzika, Rose-Marie; Engle, Judith; Parks, Catherine; Wickman, Boyd. 1993. Variation in phenology and monoterpene patterns of defoliated and nondefoliated Douglas-fir (Pseudotsuga menziesii var. glauca). Res. Pap. PNW-RP-459. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 10 p
KeywordsSpruce budworm (Choristoneura occidentalis), Douglas-fir, phenology, monoterpenes
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