Hylurgus ligniperda

(Fabricius, 1787)

Goldenhaired Bark Beetle, Red-haired Bark Beetle

Hylurgus ligniperda is an to Europe that has established across multiple continents. It is a significant forest pest primarily associated with pine trees (Pinus spp.), where it colonizes roots and lower trunk sections. The exhibits in : males produce stridulatory sounds during courtship and disturbance, while females are silent. Its invasion success is facilitated by symbiotic relationships with ophiostomatoid and diverse bacterial that assist with , detoxification of secondary metabolites, and to environmental temperature fluctuations.

Hylurgus ligniperda by (c) Landcare Research New Zealand Ltd., some rights reserved (CC BY). Used under a CC-BY license.

Hylurgus ligniperda dorsal by Landcare Research New Zealand Ltd.. Used under a CC BY 4.0 license.

2020 03 20 Hylurgus ligniperda0 by Slimguy. Used under a CC BY 4.0 license.

Pronunciation

How to pronounce Hylurgus ligniperda: /hɪˈlɜrɡəs ˌlɪɡnɪˈpɜrdə/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

Males possess a stridulatory organ absent in females, enabling sound production. Acoustic can distinguish H. ligniperda from other wood-boring pests: feeding produces higher pulse counts (27.00 ± 22.31) and peak frequencies (3208.25 ± 783.62 Hz) compared to crawling , and significantly differs from in spectral and temporal parameters. Visual identification relies on standard within Scolytinae; specific diagnostic features require examination.

Images

Habitat

Pine forests, primarily colonizing roots and lower trunk sections of trees. In Pinus thunbergii, occupies root sections up to 1 m depth, with spatial distribution shifting deeper into roots as host tree health declines.

Distribution

to Europe (Austria, Belarus, Belgium, Bosnia-Herzegovina, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Italy, Latvia, Lithuania, Macedonia, Moldova, Montenegro, Netherlands, Norway, Poland, Portugal, Russia, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, UK, Ukraine). to Asia (China, India, Japan, Sri Lanka, Turkey), Africa (Morocco, South Africa, Saint Helena, Swaziland, Tunisia), North America (USA: California, New York), South America (Brazil, Chile, Uruguay), and Oceania (Australia, New Zealand).

Diet

Feeds on phloem and inner bark of pine trees (Pinus spp.). Associated bacteria assist in degrading terpenoids and other toxic secondary metabolites of trees.

Host Associations

Pinus spp. - primary Primary ; includes P. thunbergii, P. radiata, and other pine
Ophiostomatoid fungi - mutualistic Includes six : Ceratocystiopsis, Graphilbum, Hawksworthiomyces, Leptographium, Masuyamyces, Ophiostoma; six new described from China. facilitate and invasion success
Rahnella perminowiae - endosymbiontCore culturable bacterium; increases abundance during cold periods, produces and at low temperatures, reduces time by 20.9 days when fed on converted diet at 5°C
Serratia marcescens - endosymbiontCore culturable bacterium; in bacterial
Hafnia psychrotolerans - endosymbiontCore culturable bacterium involved in temperature
Bursaphelenchus tusciae - nematode Reported in Tunisia; serves as or for this nematode
Cryphalus sp. - co-occurringCo-occurs on same trees; occupies entire trunk, minimal competition due to spatial segregation
Arhopalus rusticus - co-occurringCo-occurs on same trees; concentrated in lower-middle trunk and root section to 1 m depth
Shirahoshizo sp. - co-occurringCo-occurs on same trees; distribution pattern less defined

Life Cycle

with four larval and pupal stage. Laboratory rearing indicates time of 72 days. Females lay average of 30.9 . Six continuous generations produced in laboratory conditions using artificial diet.

Behavior

Males produce stridulatory sounds in two contexts: during courtship and when disturbed. Acoustic signals are single-noted with modified spectro-temporal parameters based on behavioral context; physical interactions more strongly affect call parameters than acoustic signals from nearby males. Females do not produce stridulatory sounds. Feeding and crawling activities produce distinct acoustic signatures detectable via acoustic .

Ecological Role

forest pest causing devastating damage to pine trees. Primary colonizer of roots, becoming more during later stages of tree decline. Facilitates ophiostomatoid fungal , which in turn supports invasion success. Minimal competitive overlap with co-occurring wood-boring due to spatial .

Human Relevance

of major concern for international trade in wood products and logs. Exported logs require with methyl bromide; research ongoing to identify alternative treatments. Subject of acoustic development for early non-destructive of cryptic . Potential target for microbe-targeted control strategies based on bacterial manipulation.

Similar Taxa

Buprestidae (jewel beetles)Co-occurring wood-boring pests; distinguishable by acoustic parameters: H. ligniperda exhibits higher pulse count, peak frequency (3208 Hz vs. 1291 Hz), and distinct amplitude patterns during feeding
Cryphalus sp.Co-occurring on Pinus; distinguishable by spatial distribution—Cryphalus occupies entire trunk while H. ligniperda primarily targets roots
Arhopalus rusticusCo-occurring wood-borer; distinguishable by use—A. rusticus concentrated in lower-middle trunk and upper root section, with limited spatial overlap

More Details

Acoustic Communication

Males exhibit in . Call variations occur primarily in spectral domain (centroid and maximum frequencies largest contributors to variability). Hierarchical clustering indicates physical interactions more important than acoustic stimulation in modifying call parameters.

Bacterial Community Structure

harbor highest bacterial diversity and richness, followed by , with lowest. : Proteobacteria, Firmicutes, Actinobacteriota. Functional prediction indicates enrichment in terpenoid backbone biosynthesis, aromatic compound degradation, and limonene/pinene degradation—functions likely assisting and detoxification.

Climate Change Vulnerability

Highly suitable projected to decline under future climate scenarios despite overall suitable habitat remaining stable. Precipitation significantly influences distribution and interactions with (Platysoma lineare, Thanasimus formicarius, Platysoma oblongum).