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... Hylobius abietis migrates by flight to new breeding habitats early in summer. Flight speed and height, wind speeds during flight, and flight direction in relation to wind were studied in the field. Flight duration estimates were obtained from flight mill experiments. Using these data dispersal distances of the females in a population were calculated. According to this tentative estimate a majority ...
... Adults of Hylobius abietis (L.) (Coleoptera: Curculionidae) were found to locate conifer roots suitable for oviposition by utilizing host volatiles diffusing through the soil. Underground sources of host volatiles were presented to weevils in a laboratory bioassay. A cold-trapping condensate of Scots pine, Pinus sylvestris L., and fractions of it were tested. Various fractions containing host terp ...
... Age composition, seasonal occurrence, sexual development and flight muscle condition were investigated in populations of Hylobius abiets collected on a clear‐cut area during three consecutive years after cutting. Weevils that had been reproductive during any previous season were classified as old and distinguished from young weevils based on the degree of elytral scale wear. Collections were made ...
... The attraction of Hylobius abietis (L.) (Coleoptera: Curculionidae) to α-pinene was recently shown to be inhibited by limonene. This study shows that added limonene also affects the response of H. abietis to odours from natural host material. The experiments included both pieces of Scots pine suspended in pitfall traps and planted pine seedlings that had either been manually wounded or left intact ...
... Responses of three Hylastes species, Dryocoetes autographus, and two Hylobius species to terpenes and ethanol were studied in field experiments on clear-cut forest sites in Sweden using baited ground traps. alpha-Pinene alone did not attract any of the six species. A terpene blend (spruce turpentine consisting mainly of alpha-pinene, beta-pinene, and 3-carene) attracted Hylastes cunicularius, H. b ...
Pseudotsuga menziesii; carbofuran; carbosulfan; gas chromatography; insecticide residues; chemical control; insect control; Hylobius abietis
Abstract:
... Protection of young Douglas firs and other conifers from attacks by the large pine weevil, Hylobius abietis L. (Col. Curculionidae), consisted of repeated insecticide treatments by dipping or spraying with organochlorine or pyrethroid insecticides. The use of a controlled-release formulation as Marshal/SuSCon containing the systemic carbamate insecticide carbosulfan in nurseries or on reforestatio ...
Picea sitchensis; Hylobius abietis; forest plantations; population density
Abstract:
... Between 1993 and 1994 over 160 forest sites were sampled to obtain indices of pine weevil (Hylobius abietis L.) densities. Overall 48 variables were tested for their ability to explain variation in weevil numbers between compartments. The models generated from the sample data identified 14 variables as significant in influencing weevil densities. In this research note the variables are identified, ...
... Reproduction of the pine weevil (Hylobius abietis (L.) in stumps of Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies (L.) Karst) was studied in relation to stump condition. Cut surfaces of stumps were treated to promote or retard microbial colonization during the 4 months following cutting, chemical and physiological properties of the stumps were monitored. The number of emerging we ...
... In assessments of pine weevil (Hylobius abietis (L.)) feeding on conifer seedlings in Sweden, positive linear relationships were found between the numbers of attacked seedlings and each of the numbers of seedlings killed by pine weevil feeding, the damage score, and the mean estimated extent of feeding on damaged seedlings. Hence the damage score was described by polynomial regression on number of ...
... Naturally produced plant volatiles, eliciting responses of single olfactory receptor neurons in the pine weevil, have been identified by gas chromatography linked with mass spectrometry. The receptor neurons (n = 72) were classified in 30 types, according to the compound which elicited the strongest response in each neuron, 20 of which compounds were identified. Most potent for 14 types of neurons ...
chemical composition; volatile compounds; electroantennography; insect attractants; Hylobius abietis; allelochemicals; beta-pinene; alpha-pinene; nutrition; Pinus sylvestris; emissions; chemical constituents of plants
Abstract:
... Attraction of the large pine weevil, Hylobius abietis (L.) (Coleoptera: Curculionidae) to pine logs was enhanced by the presence of weevils already on the logs. We investigated the volatiles emitted by insects feeding on host trees to determine the mechanism of the attraction. Chemical analyses of the collected volatiles showed large amounts of monoterpenes. There were no qualitative differences i ...
... We assayed 12 plant-derived and 1 insect-produced allelochemicals-verbenone, borneol, bornyl acetate, carvone, cucurbitacin, myrcene, limonin, 4-allyanisole, alpha-pinene, beta-pinene, limonene, and coumarin-for inhibition of feeding by the pine weevil Hylobius abietis L. Scots pine twigs were treated with these compounds dissolved in ethyl acetate solvent, and adult weevils were fed for 48 h on t ...