| elution rate and spacing of antiaggregation pheromone dispensers for protecting live trees from dendroctonus pseudotsugae (coleoptera: scolytidae). | the antiaggregation pheromone 3-methylcyclohex-2-en-1-one (mch) is highly effective in preventing the infestation of high-risk trees by douglas-fir beetle, dendroctonus pseudotsugae hopkins. a large portion of the cost of an mch treatment is related to the time applicators spend walking through an area dispersing the formulated pheromone. application of fewer mch dispensers eluting at a higher rate than those currently registered for operational use could potentially reduce treatment costs. two ... | 2002 | 12216820 |
| angiosperm bark volatiles disrupt response of douglas-fir beetle, dendroctonus pseudotsugae, to attractant-baited traps. | antennally active, bark-derived, angiosperm volatiles were tested singly and in groups for their ability to disrupt the response of the douglas-fir beetle (dfb), dendroctonus pseudotsugae, to attractant-baited multiple-funnel traps. one compound, conophthorin, was active alone in reducing the response of beetles to the baited traps. further experiments showed disruptive activity in two aliphatic green-leaf alcohols [1-hexanol and (z)-3-hexen-1-ol], as well as guaiacol and benzyl alcohol, and thr ... | 2001 | 14768811 |
| douglas-fir and western larch: chemical and physical properties in relation to douglas-fir bark beetle attack. | frequency of douglas-fir bark beetle, dendroctonus pseudotsugae hopkins (coleoptera: scolytidae), attack on western larch (lark occidentalis nutt.) was negatively correlated with 3-carene content of the xylem oleoresin. concentrations of all oleoresin volatiles from stem cores of standing trees were higher in douglas-fir (pseudotsuga menziesii (mirb.) franco) than in western larch with the single exception of 3-carene. successful brood production by the douglas-fir bark beetle in standing trees ... | 1986 | 14975882 |
| dendroctonus pseudotsugae: a hypothesis regarding its primary attractant. | the douglas-fir beetle is attracted to alpha-pinene but repelled by beta-pinene. attacks on standing trees are related to the content of alpha- or beta-pinene in the tree; this correlation suggests that volatile oils may be the stimuli initially attracting the insect to the douglas fir. | 1965 | 17782298 |
| sound production in scolytidae:chemostimulus of sonic signal by the douglas-fir beetle. | stridulation by male dendroctonus pseudotsugae was recorded in response to the natural female attractant (frass) or to three synthetic components of the attractant (frontalin, 3-methyl-2-cyclohexen-1-one, and trans-verbenol). this stridulation was acoustically distinct from stress sound and correlated with known attraction behavior. the response of female d. pseudotsugae to male stridulation-negation her attraction-was induced by playback of recorded attractant stridulation but not by that of st ... | 1972 | 17813834 |
| using automated flight mills to manipulate fat reserves in douglas-fir beetles (coleoptera: curculionidae). | because current techniques for quantifying fat, the main fuel used for flight in insects, are destructive, researchers are limited to only one direct measure of fat per specimen. this limitation is problematic for studies aimed at assessing whether fat loss through flight influences subsequent behavioral activity. to overcome this problem, we used body volume, body mass, emergence day, and brood density as parameters in a multiple regression model to predict initial fat levels in female douglas- ... | 2008 | 18801248 |
| high release rate 3-methylcyclohex-2-en-1-one dispensers prevent douglas-fir beetle (coleoptera: curculionidae) infestation of live douglas-fir. | the douglas-fir beetle, dendroctonus pseudotsugae hopkins (coleoptera: curculionidae), antiaggregation pheromone, 3-methylcyclohex-2-en-1-one (mch), has been used by natural resource managers and landowners to protect high-value, high-risk trees from douglas-fir beetle infestation throughout the western united states since 2000. labor is a major portion of the cost of mch treatments. mch is applied by walking through treatment areas and stapling the formulated pheromone in bubble capsules to tre ... | 2008 | 19133463 |
| effect of geographic isolation on genetic differentiation in dendroctonus pseudotsugae (coleoptera: curculionidae). | genetic structure of phytophagous insects has been widely studied, however, relative influence of the effect of geographic isolation, the host plant or both has been subject of considerable debate. several studies carried out on bark beetles in the genus dendroctonus evaluated these factors; nonetheless, recent evidence has shown that genetic structuring is a more complex process. our goal was to examine the effect of geographic isolation on genetic structure of the douglas-fir beetle dendrocton ... | 2009 | 19490169 |
| spatial variability in tree regeneration after wildfire delays and dampens future bark beetle outbreaks. | climate change is altering the frequency and severity of forest disturbances such as wildfires and bark beetle outbreaks, thereby increasing the potential for sequential disturbances to interact. interactions can amplify or dampen disturbances, yet the direction and magnitude of future disturbance interactions are difficult to anticipate because underlying mechanisms remain poorly understood. we tested how variability in postfire forest development affects future susceptibility to bark beetle ou ... | 2016 | 27821739 |
| volatile and within-needle terpene changes to douglas-fir trees associated with douglas-fir beetle (coleoptera: curculionidae) attack. | mass attack by tree-killing bark beetles (curculionidae: scolytinae) brings about large chemical changes in host trees that can have important ecological consequences. for example, mountain pine beetle (dendroctonus ponderosae hopkins) attack increases emission of terpenes by lodgepole pine (pinus contorta dougl. ex loud.), affecting foliage flammability with consequences for wildfires. in this study, we measured chemical changes to douglas-fir (pseudotsuga menziesii var. glauca (mirb.) franco) ... | 2016 | 27231258 |
| evaluating high release rate mch (3-methylcyclohex-2-en-1-one) treatments for reducing dendroctonus pseudotsugae (coleoptera: curculionidae) infestations. | current recommendations for applying the antiaggregation pheromone 3-methylcyclohex-2-en-1-one (mch) to protect live trees from douglas-fir beetle, dendroctonus pseudotsugae hopkins, infestation are to space individual passive releasers (mch bubble capsules) on a 12- by 12-m grid throughout areas to be protected. previous field studies and a theoretical study using a puff dispersion model to predict pheromone concentrations have shown that releasers emitting higher rates of mch spaced farther ap ... | 2016 | 27694506 |
| bark beetle effects on fuel profiles across a range of stand structures in douglas-fir forests of greater yellowstone. | consequences of bark beetle outbreaks for forest wildfire potential are receiving heightened attention, but little research has considered ecosystems with mixed-severity fire regimes. such forests are widespread, variable in stand structure, and often fuel limited, suggesting that beetle outbreaks could substantially alter fire potentials. we studied canopy and surface fuels in interior douglas-fir (pseudotsuga menziesii v. glauca) forests in greater yellowstone, wyoming, usa, to determine how f ... | 2013 | 23495632 |
| predicting dendroctonus pseudotsugae (coleoptera: curculionidae) antiaggregation pheromone concentrations using an instantaneous puff dispersion model. | an instantaneous puff dispersion model was used to assess concentration fields of the douglas-fir beetle, dendroctonus pseudotsugae hopkins, antiaggregation pheromone, 3-methylcyclohex-2-en-1-one (mch), within a 1-ha circular plot. several combinations of mch release rate and releaser spacing were modeled to theoretically analyze optimal deployment strategies. the combinations of mch release rate and releaser spacing used in the modeling exercise were based on results of previous field studies o ... | 2012 | 22606815 |
| historical demography and phylogeography of a specialist bark beetle, dendroctonus pseudotsugae hopkins (curculionidae: scolytinae). | contemporary distribution of north american species has been shaped by past glaciation events during the quaternary period. however, their effects were not as severe in the southern rocky mountains and northern mexico as elsewhere in north america. in this context, we test hypotheses about the historical demography of dendroctonus pseudotsugae, based on 136 haplotypes of mitochondrial cytochrome oxidase i. the phylogenetic analysis yielded four haplogroups corresponding to northwestern united st ... | 2010 | 22546468 |
| dendroctonus pseudotsugae hopkins (coleoptera: scolytidae): production of and response to enantiomers of 1-methylcyclohex-2-en-1-ol. | female douglas-fir beetles,dendroctonus pseudotsugae, produced an average 45∶55 mixture of the (s)-(-)- and (r)-(+)-enantiomers of 1-methylcyclohex-2-en-1-ol (mcol). the (s)-(-)∶(r)-(+) ratio of 3-methylcyclohex-2-en-1-ol (seudenol) produced by this population of females was 34∶66. lindgren funnel traps baited with (r)-(+)-mcol attracted significantly more males and females than (s)-(-)-mcol-baited traps, which captured significantly more beetles than unbaited controls. the combined effect of th ... | 1992 | 24254159 |
| sites of production and occurrence of volatiles in douglas-fir beetle,dendroctonus pseudotsugae hopkins. | volatiles were found to be distributed throughout adult douglasfir beetles,dendroctonus pseudotsugae hopkins, suggesting that the hindgut may not be the sole site of production. the volatile content of individual beetles increased dramatically with feeding; qualitative changes reflected the different bark habitats of newly emerged and established beetles. all detected volatiles were also found in beetle frass. myrcene was the predominant monoterpene of emergent beetles and α-pinene of fed beetle ... | 1988 | 24276212 |
| multiple acceptors for pheromonal enantiomers on single olfactory cells in the douglas-fir beetle,dendroctonus pseudotsugae hopk. (coleoptera: scolytidae). | olfactory perception of pheromonal enantiomers by male and female douglas-fir beetles,dendroctonus pseudotsugae hopk. (coleoptera: scolytidae), was investigated by electrophysiological techniques and behavioral bioassays. electroantennograms (eags) and single-cell responses indicated both sexes to be more responsive to racemic frontalin and the (-)-enantiomer at lower dosages. at higher dosages, little difference was noted in responses to either enantiomer. however, response to the racemic mixtu ... | 1985 | 24311179 |
| single cell responses of the douglas-fir beetle,dendroctonus pseudotsugae hopkins (coleoptera: scolytidae), to pheromones and host odors. | olfactory perception of pheromones and host odors bydendroctonus pseudotsugae males and females was investigated through single cell recordings. responses of 71 cells (35 cells in males; 36 cells in females) were recorded to 1 μg of 10 pheromones and three host terpenes. the olfactory cells were classified into four types based on sensitivity and specificity for the various odors: (1) 3,2-mchone (3-methyl-2-cyclohexenone) cells; (2) 3,2-mchol (3-methyl-2-cyclohexenol) cells; (3) frontalin cells; ... | 1984 | 24318599 |
| antennal olfactory responsiveness of douglas-fir beetle,dendroctonus pseudotsugae hopkins (coleoptera: scolytidae) to pheromones and host odors. | electroantennograms were obtained fromd. pseudotsugae in response to the pheromones 3-methylcyclohex-2-en-1-one (3,2-mchone), 3-methylcyclohex-2-en-1-ol (3,2-mchol), frontalin,trans-verbenol, verbenone, and the host terpene hydrocarbons limonene and camphene. male and female beetles were 10 and 100 times more sensitive to 3,2-mch-one and 3,2-mchol than to the other compounds. of the other compounds, males were most sensitive totrans-verbenol, verbenone, and camphene, while females were most sens ... | 1983 | 24408727 |
| nematode parasites and associates of dendroctonus spp. and trypodendron lineatum (coleoptera: scolytidae), with a description of bursaphelenchus varicauda n.sp. | nematode parasites and associates of four bark beetle species in british columbia were surveyed. bursaphelenchus varicauda n.sp., ektaphelenchus macrostylus, panagrolaimus dentatus, and cryptaphelenchus latus were found associated with dendroctonus pseudotsugae. parasitorhabditis obtusa was found in the gut and contortylenchus reversus in the hemocoel of both d. pseudotsugae and d. rufipennis. the latter also had hemocoel infections of sphaerulariopsis dendroetoni, which were not found concomita ... | 1983 | 19295808 |
| effects of contortylenchus reversus (nematoda : sphaerulariidae) on hemolymph composition and oocyte development in the beetle dendroctonus pseudotsugae (coleoptera : scolytidae). | | 1975 | 1151104 |
| haemolymph and ovarial proteins in the bark beetle, dendroctonus pseudotsugae in relation to ovarian development. | | 1970 | 5534530 |
| masking of the aggregation pheromone in dendroctonus pseudotsugae hopk. | the pheromone mask released by female dendroctonus pseudotsugae hopk. after the male stridulates stops aggregation of beetles in flight, but not arrestment of males, in an interaction of chemically and sonically induced behavior. this masking is viewed as a mechanism for survival through the regulation of attack and as a critical part of premating behavior. | 1969 | 17815753 |