Ecological Impacts of Leptoglossus Occidentalis on Coniferous Seed Production
Summary
The western conifer seed bug, Leptoglossus occidentalis, is an invasive sap-sucking hemipteran that has rapidly colonised coniferous forests in Europe, Asia and the Mediterranean. Both adults and nymphs bore through cone scales to consume developing seeds, extracting oils and endosperm and thereby reducing seed viability and germination success. In key nut-producing species such as Pinus pinea, elevated feeding damage has coincided with sharp declines in cone yield and nut quality. These impacts not only undermine commercial pine nut production but also hinder natural forest regeneration, compromise genetic diversity and alter faunal communities dependent on pine seeds. Feeding injury is often exacerbated by abiotic stressors—particularly drought and temperature extremes—that weaken cone development and compound seed mortality. Moreover, the pest’s dispersal capacity and thermal preferences have facilitated its spread to novel regions, while interactions with fungal pathogens can further degrade cone health. Integrated research into bug behaviour, ecological drivers and control methods is therefore essential to safeguard both ecological integrity and the livelihoods dependent on conifer seed resources.
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Ecological Impacts of Leptoglossus Occidentalis on Coniferous Seed Production publication trend
The graph below shows the total number of articles in ecological impacts of leptoglossus occidentalis on coniferous seed production across all publications each year (not limited to Nature Index journals).
Technical terms
Conifer seed bug (Leptoglossus occidentalis): An invasive true bug that uses piercing–sucking mouthparts to feed on developing seeds of multiple conifer species.
Dry cone syndrome: A condition characterised by desiccated or prematurely aborted cones, often associated with combined insect feeding and environmental stress.
Oviposition: The process by which female insects lay eggs, in this case on or near conifer cones.
Thermoregulation: The behavioural or physiological modulation of body temperature, influencing host-location and feeding activity.
Biocontrol agent: A natural enemy, such as a parasitoid wasp, employed to reduce the population density of a pest species.
References
- The stone pine, Pinus pinea L., a new highly rewarding host for the invasive Leptoglossus occidentalis. NeoBiota (2018).
- Potential Factors behind the Decline of Pinus pinea Nut Production in Mediterranean Pine Forests. Forests (2021).
- Evaluation of thermoregulation of different pine organs in early spring and estimation of heat reward for the western conifer seed bug (Leptoglossus occidentalis) on male cones. PLOS ONE (2022).
- Ooencyrtus pityocampae Mercet (Hymenoptera: Encyrtidae): a potential biocontrol agent of the seed bug, Leptoglossus occidentalis Heidemann (Heteroptera: Coreidae). Egyptian Journal of Biological Pest Control (2022).
- Lattice Structure and Spatial Network Models Incorporating into Simulating Human-Mediated Dispersal of the Western Conifer Seed Bug Populations in South Korea. Forests (2023).
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