Trap catch data are poor predictors of damage caused by pine weevil (Hylobius abietis) to conifer seedlings

Nordlander, Göran; Björklund, Niklas; Hellqvist, Claes; Nordenhem, Henrik; Liziniewicz, Mateusz; Hjelm, Karin

doi:10.1016/j.foreco.2023.120968

Cited by 3 publications

(7 citation statements)

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“…Estimations of population sizes on regeneration sites of harvested coniferous stands range from 14,000 individuals per hectare in the parent generation up to 220,000 individuals per including potentially emerging young H. abietis (Leather et al, 1995;Moore et al, 2003;Nordlander, Bylund, et al, 2003). Even though the data of this study implies an effective reduction of the local H. abietis population, this assumption cannot be verified exclusively based on the number of trapped individuals, which is also stressed by Nordlander et al (2023).…”

Section: Overviewmentioning

confidence: 76%

“…It is debatable whether a local population reduction of H. abietis by trapping is possible (Fedderwitz et al, 2022; Olenici et al, 2016). A recent study by Nordlander et al (2023) did not find a relationship between trap catch data and damage on seedlings, implying that other factors than the population size determine the extent of seedling damage. Alternative food sources reduce the attractivity of traps, hence complex attractant combinations are necessary, which can compete with other food sources on the regeneration site.…”

Section: Discussionmentioning

confidence: 89%

“…Population densities are estimated to rise up to 220,000 individuals per hectare, but also at low population densities, H. abietis is able to cause severe damage (Inward et al, 2012; Leather et al, 1995). There is furthermore strong evidence that damage on regeneration sites is not mainly influenced by the population size but strongly by the availability of alternative food sources such as roots of living trees and branches (Nordlander et al, 2023; Nordlander, Bylund, et al, 2003; Nordlander, Orlander, & Langvall, 2003) increasing the complexity of mass trapping efforts. Consequential highly attractive lures applied in effective trap systems are necessary to locally and temporarily reduce the population densities of the target insects in a way that secures the economic and ecological goals of the forest owners.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of trap type and attractant composition for potential mass trapping of Hylobius abietis

Heber,

Helbig,

Osmers

et al. 2023

Agri and Forest Entomology

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Different trap types and attractant compositions were tested with the goal of attracting as many individuals of Hylobius abietis as possible while assuring a minimal bycatch of nontarget species with regard to the family Carabidae on three study sites in the east of Germany. The results revealed a modified pitfall trap based on a model by Nordlander (1987, Scandinavian Journal of Forest Research, 2, 199–213.) as the most effective trap type with a high degree of selectivity and minimal ecological side effects. The modified Nordlander trap is suitable for potential H. abietis mass trapping as an instrument of integrated pest management. Two field trials testing different attractant compositions showed that a simple attractant combination of (−)‐α‐pinene and ethanol is as effective as other more complex combinations and thus preferable for mass trapping efforts. The addition of the monoterpenes camphene, Δ‐3‐carene, ocimene and terpinolene to the combination of (−)‐α‐pinene and ethanol did not increase trapping numbers significantly. Trapping numbers of H. abietis indicate that a reduction of the local H. abietis population by trapping is possible, though further research about the influence of mass trapping on regeneration damage is recommended.

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Section: Overviewmentioning

confidence: 76%

Section: Discussionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

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Evaluation of trap type and attractant composition for potential mass trapping of Hylobius abietis

Heber,

Helbig,

Osmers

et al. 2023

Agri and Forest Entomology

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“…We split the study into two objectives (a determination of clear-cut factors and weevil abundance and a comparison of the damage to three seedling types (tree species and age of seedlings) because the relationship between the number of pine weevils and damaged seedlings is very weak, as evidenced by several studies (Wilson and Day, 1994;Örlander et al, 1997;López-Villamor et al, 2019;Nordlander et al, 2023). The level of damage to seedlings cannot be related to the number of weevils caught in traps, as seedlings planted at the locality provide only part of the available food source for pine weevils (Nordlander et al, 2023). Adults naturally feed on branches in the crowns of mature trees and their roots or logging residues (Nordlander et al, 2003;Hansen et al, 2005;Fedderwitz et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

“…For example, the orientation of adult weevils involves responses to light and humidity, and their responses vary at different stages of the life cycle; e.g., older reproductive weevils are strongly photonegative (Havukkala and Selander, 1976;Havukkala, 1979). Nordlander et al (2023) found that harvested stump species (coniferous vs. deciduous) and the age of clear-cuts affect pine weevil abundance and damage (Nordlander et al, 2023).…”

Section: Pine Weevil Spreadmentioning

confidence: 99%

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Pine weevil (Hylobius abietis) preferences among species of conifer seedlings planted on clear-cuts in central Europe

Dvořáková,

Holuša,

Horák

et al. 2024

Front. For. Glob. Change

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IntroductionAs a result of climate change and bark beetle outbreaks in forests, extensive salvage, and sanitary cutting have been undertaken in Europe, resulting in many clear-cuts with coarse stumps. The populations of pine weevils (Hylobius abietis and Hylobius pinastri) are steadily increasing. A high abundance of pine weevils feeding on seedlings typically results in significant economic losses and prolongs the forest establishment period. However, information on these species spatial distribution and habitat selection patterns, necessary for assessing their harmfulness and subsequently accurately estimating their threat to reforested areas, is lacking. To determine which factors influence spatial selection patterns and seedling type preference, this study investigated which clear-cut factors increase pine weevil abundance and which seedling types (species and age) are the most preferred.MethodsThe experiment was carried out on 20 clear-cuts in the central Czech Republic. We evaluated soil moisture level, average stump distance and diameter, proportion of other conifers, and whether the stumps were mulched. We detected the abundance of pine weevils using pitfall traps. We determined the feeding scar intensity on the first 10 cm of seedling stems on commonly used seedlings for reforestation in central Europe: 1-year-old Scots pine (Pinus sylvestris), European larch (Larix decidua), and 3-year-old Norway spruce (Picea abies), with 1,200 seedlings in total. The individual seedling types alternated in rows. The results were evaluated using generalized linear mixed-effect models (GLMMs). As dependent variables we used total numbers of H. abietis and H. pinastri. The soil moisture level, mulching, proportion of other conifers, average stump diameter, and distance were considered independent variables.ResultsWe found that Norway spruce was the least attractive to pine weevils. We found a higher abundance of H. abietis females in moist clear-cuts, confirming that dry clear-cuts are less suitable for oviposition.ConclusionAccording to our findings, if foresters want to plant coniferous seedlings, it seems that planting older spruce is a better option than planting larch and pine. These findings provide valuable insights for forest management and reforestation strategies, equipping foresters with the knowledge to mitigate the threat of pine weevils and ensure successful forest establishment.

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Trap catch data are poor predictors of damage caused by pine weevil (Hylobius abietis) to conifer seedlings

Cited by 3 publications

References 59 publications

Evaluation of trap type and attractant composition for potential mass trapping of Hylobius abietis

Evaluation of trap type and attractant composition for potential mass trapping of Hylobius abietis

Image_1.JPEG

Pine weevil (Hylobius abietis) preferences among species of conifer seedlings planted on clear-cuts in central Europe

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