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Hylobius abietis; Picea abies; administrative management; bark; carene; chemical defenses; cineole; conifers; forest ecology; limonene; methyl jasmonate; pesticides; plant age
Abstract:
... Nursery-grown Norway spruce Picea abies seedlings are often heavily attacked by the pine weevil Hylobius abietis on clear-cuts the first years after planting. Because the seedlings are not resource-limited during the growing phase in the nursery they are expected to invest less in defence than naturally regenerated seedlings already present on the clear-cuts. The latter have had to cope with vario ...
Hylobius abietis; Picea abies; administrative management; conifers; forest ecology; insecticide application; mortality; site preparation; soil; Finland
Abstract:
... The pine weevil (Hylobius abietis L.) is among the worst pests of newly planted conifer seedlings in Europe. EU regulations restrict the use of insecticides, the cost of mechanical site preparation (MSP) is high, and it has even been suggested that MSP should be abandoned due to social and environmental causes. The aim of this study was to investigate i) the field performance of Norway spruce (Pic ...
... Defense can be induced in conifer seedlings to reduce pine weevil (Hylobius abietis) damage, by treatment with the plant hormone methyl jasmonate (MJ). Few studies have addressed important practical issues regarding the use of MJ such as treatment incidence and timing, seedling age and its compatibility with plant nursery practices. We examined if levels of pine weevil damage depend on seasonal ti ...
... Forest regeneration can be compromised by insect damage to newly-planted conifer seedlings, with the pine weevil, Hylobius abietis, being the most economically important pest in Europe. Seedling protection strategies include physical barriers, silvicultural measures and insecticides, while the potential benefits of Associational Effects (AE) have been little explored. Associational Resistance (AR) ...
... Adult feeding preferences of Hylobius abietis on Picea abies, Larix decidua, Pinus sylvestris, Pseudotsuga menziesii, Abies alba and Betula pendula were tested in outdoor conditions. The preferred food source was P. menziesii, and the mean bark area consumed per seedling was 440.8 ± 147.9 mm². The second most preferred host was P. abies. The coniferous species that suffered the least damage was A. ...
... A plant's induced defense system can be triggered by the application of the plant hormone methyl jasmonate (MeJA), and recent research suggest that MeJA treatment may become a tool for protection of conifer seedlings against insect herbivory (e.g. by the pine weevil Hylobius abietis). A side-effect of MeJA application is temporarily reduced height growth. This has generally been considered as nega ...
Heterobasidion; Hylastes; Hylobius abietis; Picea abies; bioenergy; economic investment; forest ecosystems; forest ownership; harvesting; health status; inoculum; logging; long term effects; monitoring; planting; root rot; roots; seedlings; stand development; stump extraction; stumps; tree health; voles
Abstract:
... Although impacts of intensive forest harvesting practices such as removing logging residue and stumps for bioenergy on forest ecosystem has been extensively studied, no information is available about the long-term effects of stump harvesting on the health status of young Norway spruce stands. In the present study, we surveyed damage caused by the large pine weevil (Hylobius abietis L.) and other c ...
... The large pine weevil (Hylobius abietis) is an important pest of freshly planted coniferous trees. Feeding damage to conifer seedlings can be prevented by protecting the seedlings (mechanically or chemically), or by reducing H. abietis abundance. The entomopathogenic fungus Beauveria bassiana has promise for H. abietis control. To test the effects of the B. bassiana-colonized carriers (25 mm in di ...
... The large pine weevil (Hylobius abietis L.) is an important pest of young forest stands in Europe. Larvae develop under the bark of freshly cut pine and spruce stumps, but maturing weevils feed on the bark of coniferous seedlings. Such seedlings frequently die because of bark consumption near the root collar. We tested the effect of three treatments (the insecticide alpha cypermethrin, a wax coati ...
Hylobius abietis; Picea abies; conifers; humus; insecticides; mineral soils; planting; risk; seedling growth; seedlings; site preparation; stony soils; survival rate; trenching; Northern European region
Abstract:
... In northern Europe, there are high risks of severe pine weevil (Hylobius abietis) damage to newly planted conifer seedlings. Site preparation is one of the most important measures for reducing these risks and as several studies have shown the damage is highly dependent on the amount of pure mineral soil around the seedlings. We investigated effects of three site preparation techniques: (1) disc tr ...
... The pine weevil (Hylobius abietis), a major pest of conifer forests throughout Europe, feeds on the bark and cambium, tissues rich in terpenoid resins that are toxic to many insect herbivores. Here, we report the ability of the pine weevil gut microbiota to degrade the diterpene acids of Norway spruce. The diterpene acid levels present in ingested bark were substantially reduced on passage through ...
... Stump harvesting can help in managing forest pests, improve site preparation, and provide a source of bioenergy. However, stump removal does not remove all the roots from clear-cut areas. To investigate whether stump removal helps to manage forest pests, the effect of stump removal and its timing on the breeding and larval feeding activities of pine weevil (Hylobius abietis) and Hylastes spp. was ...
... As the use of mounding as a soil preparation method and mechanized planting become more common, the use of deep planting has increased. In deep planting, a greater portion of the stem is buried below the soil surface. However, it is feared that this increases the risk of insect damage, especially damage from the pine weevil Hylobius abietis (L.) (Coleoptera: Curculionidae). The effects of planting ...
... Feeding by pine weevil (Hylobius abietis L.) causes severe damage to newly planted conifer seedlings in most parts of Scandinavia. We investigated the effect of planting time and insecticide treatment on pine weevil damage and seedling growth. The main objective was to study if planting in early autumn on fresh clear-cuts would promote seedling establishment and reduce the amount of damage caused ...
... Regeneration of northern conifer forests is commonly performed by reforestation with genetically improved materials obtained from long-term breeding programs focused on productivity and timber quality. Sanitary threats can, however, compromise the realization of the expected genetic gain. Including pest resistance traits in the breeding programs may contribute to a sustainable protection. Here we ...
Dryocoetes; Hylobius abietis; Picea abies; Rhagium; breeding; dead wood; habitats; insects; phylogeny; rearing; roots; species diversity; stumps; wood
Abstract:
... Stump extraction (which include removal of coarse roots) will reduce the available habitat for insects breeding in dead wood (saproxylic species). The root-living diversity is largely unknown which is unsatisfactory as 68% of the wood harvested at stump extraction is root wood. We compared the diversity of saproxylic beetles in Norway spruce, Picea abies, coarse roots with that in the above-ground ...
Hylobius abietis; Picea abies; growing season; humus; lambda-cyhalothrin; mineral soils; mortality; planting; prediction; risk; seedlings; statistical models; Finland
Abstract:
... Several insecticides used against large pine weevil (Hylobius abietis (L.)) feeding have been prohibited due to environmental and health issues. Thus, there is a need to find other protection methods. We investigated whether spot mounding without insecticide protection could ensure high seedling survival in boreal conditions. In addition, we predicted pine weevil feeding and mortality by site, pla ...
... Conifer defences can be induced by exogenous chemical elicitors, thereby reducing damage caused by bark-feeding insects. However, the insect behavioural mechanisms involved are poorly understood. Thus, effects of artificially induced plant defences on feeding behaviour of the pine weevil (Hylobius abietis), a serious forest pest, were examined to explore mechanisms involved in decision-making proc ...
Hylobius abietis; Picea abies; Pinus sylvestris; acetates; bait traps; branches; chemical defenses; cineole; conifers; crop production; dispensers; elicitors; gas chromatography-mass spectrometry; methyl jasmonate; phloem; seedlings; trees; Europe
Abstract:
... 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 seedlings in conifer regenerations. However, in a previous experiment, MeJA treatment resulted in substan ...
... Analysis of the feeding behavior of animals using such a high temporal resolution that meals can be defined may improve our understanding of the mechanisms regulating feeding. Meals can be distinguished in an ethologically meaningful manner by using the ‘meal criterion’, the shortest non‐feeding interval between feeding bouts recognized as meals. However, such a criterion has only been determined ...