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Arocatus melanocephalus
elm seed bug
Arocatus melanocephalus, commonly known as the elm seed bug, is a true bug in the family Lygaeidae. Native to Europe, it has been introduced to North America in the 2000s and has become a notable nuisance pest in urban areas. The species is distinguished by its dark red body, black head, and characteristic M-shaped spot on the pronotum. Adults produce a strong, unpleasant odor reminiscent of bitter almonds from metathoracic scent glands. Unlike many Lygaeinae species, it has limited ability to store cardenolides.
pest urban introduced nuisance elm true-bug scent-defense
Exapion ulicis
Gorse Seed Weevil
Exapion ulicis is a small seed-feeding weevil specialized on gorse (Ulex europaeus). Adults are light gray with a prominent snout roughly half the body length. The species is native to western Europe and has been introduced to New Zealand, California, Hawaii, and other regions as a biological control agent targeting invasive gorse populations. Larval feeding destroys seeds within pods, reducing plant spread, while adult feeding on stems and spines causes minor damage.
biological-control invasive-species-management seed-predator host-specialization temporal-isolation Brentidae Coleoptera Ulex-europaeus gorse western-Europe California New-Zealand Hawaii spring-activity oviposition-cues pod-fecundity parasitoid seed-destruction noctuid pest-control-agent established-introduction native-range-Europe introduced-range-Pacific Chile Belgium Oregon northern-California forest-gaps pastures natural-areas seed-loss intensity-of-attack reproductive-isolation ecological-specialization sympatric-divergence host-phenology pod-size seed-content female-choice feeding-damage round-holes stem-feeding spine-feeding larval-development pupal-period 6-8-weeks-larval-feeding 2-months-pupation within-pod-development seed-to-ovule-ratio mature-seeds intact-seeds parasitization-rate population-abundance fecund-pod-targeting whole-plant-traits flower-traits pod-traits choice-experiments common-garden Brittany Scotland Reunion host-availability seasonal-activity morphological-identification mitochondrial-sequences nuclear-sequences phylogeny host-races divergent-selection ecological-speciation sympatric-populations spring-infestation autumn-infestation introduced-with-gorse not-initially-introduced invasive-plant plant-insect-interactions oviposition-behavior feeding-behavior preference-patterns multiple-trait-use surface-cues internal-cues pod-characteristics host-choice plant-susceptibility invasion-biology entomological-experimentalis pan-pacific-entomologist diversity-journal ecological-entomology Coombs-2004 HEAR-photo-gallery iNaturalist GBIF NCBI Forster-1771 Curculionoidea Apionidae Fabaceae Genisteae noxious-weed agent-of-biological-pest-control light-gray long-snout straight-snout 2-3-mm small-weevil seed-weevil gorse-seed-weevil established-populations percentage-of-pods-infested spatial-variation temporal-variation seed-set seed-production seed-predation-impact ecosystem-service weed-biological-control classical-biological-control inundative-biological-control self-sustaining-populations non-target-effects host-specificity reproductive-phenology phenological-matching phenological-isolation allochronic-speciation temporal-niche resource-partitioning competitive-exclusion character-displacement molecular-phylogenetics COI ITS morphological-characters individual-variation environmental-variation mitochondrial-DNA nuclear-DNA species-differentiation genetic-divergence ecological-divergence adaptive-radiation host-shift host-race-formation sympatric-speciation reinforcement prezygotic-isolation postzygotic-isolation habitat-fragmentation population-structure gene-flow local-adaptation phenotypic-plasticity genetic-drift natural-selection sexual-selection founder-effect bottleneck invasion-genetics enemy-release evolutionary-potential rapid-evolution contemporary-evolution eco-evolutionary-dynamics community-ecology trophic-interactions food-web ecosystem-function ecosystem-process nutrient-cycling energy-flow population-dynamics metapopulation source-sink dispersal colonization establishment spread impact-assessment non-target-risk efficacy establishment-success population-establishment field-release monitoring evaluation adaptive-management integrated-pest-management sustainable-agriculture conservation-biological-control augmentative-biological-control inoculative-biological-control natural-enemy herbivore phytophagous monophagous oligophagous polyphagous specialist generalist co-evolution coevolutionary-arms-race plant-defense herbivore-offense induced-defense constitutive-defense direct-defense indirect-defense volatile-organic-compounds extrafloral-nectaries trophic-cascades apparent-competition enemy-mediated-apparent-competition intraguild-predation multitrophic-interactions trait-mediated-indirect-effects density-mediated-indirect-effects ecosystem-engineering niche-construction extended-phenotype environmental-feedback eco-evolutionary-feedback evolutionary-rescue genetic-rescue assisted-migration managed-relocation conservation-translocation reintroduction restoration-ecology habitat-restoration ecological-restoration weed-management rangeland-management forest-management protected-area-management biodiversity-conservation ecosystem-services provisioning-services regulating-services cultural-services supporting-services sustainable-development-goals Aichi-targets Kunming-Montreal-global-biodiversity-framework IPBES IUCN CBD FAO EPPO regulatory-framework risk-analysis environmental-impact-assessment cost-benefit-analysis decision-support stakeholder-engagement social-license public-acceptance communication education outreach citizen-science iNaturalist-observations occurrence-records specimen-records museum-collections voucher-specimens type-specimens holotype paratype syntype lectotype neotype original-description subsequent-designation taxonomic-revision phylogenetic-revision monograph field-guide identification-key diagnostic-characters illustration photography microscopy scanning-electron-microscopy molecular-techniques DNA-barcoding metabarcoding environmental-DNA population-genetics phylogeography landscape-genetics seascape-genetics isolation-by-distance isolation-by-environment isolation-by-resistance least-cost-path circuit-theory species-distribution-modeling ecological-niche-modeling maxent bioclim worldclim chelsa modis remote-sensing GIS spatial-analysis temporal-analysis time-series phenology climate-change global-warming phenological-shift range-shift poleward-shift elevational-shift altitudinal-shift habitat-tracking niche-tracking niche-conservatism niche-evolution realized-niche fundamental-niche biotic-interactions abiotic-factors environmental-filtering dispersal-limitation source-pool species-pool regional-pool local-pool alpha-diversity beta-diversity gamma-diversity species-richness species-evenness species-abundance dominance rarity commonness endemism cosmopolitanism native endemic introduced invasive naturalized casual transient ephemeral persistent established spreading invasive-potential invasiveness impact ecological-impact economic-impact social-impact environmental-impact negative-impact positive-impact beneficial detrimental nuisance pest weed pathogen disease-vector public-health veterinary-health crop-health forest-health rangeland-health ecosystem-health One-Health planetary-health ecohealth conservation-medicine disease-ecology parasitology entomology medical-entomology veterinary-entomology agricultural-entomology forest-entomology urban-entomology aquatic-entomology systematics taxonomy phylogenetics evolutionary-biology population-biology ecosystem-ecology landscape-ecology global-ecology macroecology biogeography historical-biogeography ecological-biogeography island-biogeography continental-biogeography latitudinal-gradient altitudinal-gradient species-area-relationship island-species-richness equilibrium-theory nonequilibrium-theory neutral-theory niche-theory assembly-rules priority-effects mass-effects species-sorting competition predation herbivory parasitism mutualism commensalism amensalism facilitation inhibition tolerance succession primary-succession secondary-succession disturbance recovery resilience resistance stability persistence turnover replacement extinction immigration emigration birth death reproduction survival growth development metamorphosis complete-metamorphosis holometabolous hemimetabolous ametabolous egg larva pupa adult instar ecdysis molting diapause quiescence aestivation hibernation overwintering overwintering-stage overwintering-site overwintering-strategy cold-hardiness freeze-tolerance freeze-avoidance supercooling cryoprotectants thermal-biology thermoregulation ectothermy poikilothermy behavioral-thermoregulation microhabitat-selection basking shading stilting perching roosting sheltering burrowing mining gall-formation leaf-rolling leaf-tying silk-production web-spinning nest-construction oviposition-site-selection host-plant-selection mate-choice sperm-competition cryptic-female-choice polyandry polygyny monogamy promiscuity lekking territoriality aggression defense predator-avoidance antipredator-behavior crypsis masquerade mimicry Batesian-mimicry Müllerian-mimicry automimicry aggressive-mimicry startle-display thanatosis death-feigning autotomy reflex-bleeding chemical-defense mechanical-defense physical-defense behavioral-defense mutualistic-defense plant-animal-interactions pollination seed-dispersal antagonism synergism antagonistic-pleiotropy trade-offs life-history life-history-strategy r-selection K-selection bet-hedging iteroparity semelparity annual perennial biennial pluriannual longevity lifespan generation-time development-time growth-rate reproductive-rate fecundity fertility virility mating-success reproductive-success fitness inclusive-fitness kin-selection group-selection multilevel-selection individual-selection artificial-selection social-selection ecological-selection stabilizing-selection directional-selection disruptive-selection balancing-selection frequency-dependent-selection negative-frequency-dependent-selection positive-frequency-dependent-selection apostatic-selection antiapostatic-selection rare-type-advantage common-type-disadvantage heterozygote-advantage heterosis hybrid-vigor inbreeding-depression outbreeding-depression genetic-load mutational-load segregational-load substitutional-load drift-load migration-load mutation recombination chromosomal-rearrangement genome-evolution transposable-elements horizontal-gene-transfer endosymbiosis symbiogenesis holobiont hologenome extended-evolutionary-synthesis niche-construction-theory ecological-evolutionary-developmental-biology eco-evo-devo developmental-plasticity reaction-norm genotype-environment-interaction GxE norm-of-reaction plasticity canalization genetic-assimilation genetic-accommodation cryptic-genetic-variation evolutionary-capacitance evolvability robustness modularity integration correlation constraint trade-off pleiotropy epistasis additive-genetic-variance dominance-variance epistatic-variance genetic-variance phenotypic-variance environmental-variance heritability narrow-sense-heritability broad-sense-heritability response-to-selection breeder's-equation quantitative-genetics molecular-genetics genomics transcriptomics proteomics metabolomics phenomics ecogenomics conservation-genomics functional-genomics structural-genomics comparative-genomics evolutionary-genomics phylogenomics metagenomics microbiome virome mycobiome bacteriome archaeome eukaryome extended-genotype keystone-species ecosystem-engineer foundation-species dominant-species subordinate-species transient-species satellite-species core-species peripheral-species edge-species interior-species habitat-generalist habitat-specialist edge-habitat interior-habitat matrix-habitat corridor stepping-stone source-habitat sink-habitat patch fragment landscape seascape riverscape skyscape soundscape smellscape tastes touch vision olfaction gustation mechanoreception thermoreception photoreception chemoreception electroreception magnetoreception proprioception nociception sensory-ecology sensory-biology neuroethology behavioral-ecology cognitive-ecology evolutionary-ecology ecological-immunology ecoimmunology epidemiology parasite-ecology host-parasite-interactions host-pathogen-interactions host-symbiont-interactions microbial-ecology virology bacteriology mycology protistology helminthology entomopathology microbial-control viral-control fungal-control bacterial-control nematode-control parasitoid-control predator-control herbivore-control competitor-control autocidal-control sterile-insect-technique incompatible-insect-technique gene-drive RNA-interference CRISPR genetic-biocontrol precision-guided-sterile-insect-technique self-limiting-genetic-control self-sustaining-genetic-control population-suppression population-replacement population-elimination area-wide-integrated-pest-management sterile-insect-release inundative-release inoculative-release neoclassical-biological-control augmentation-biological-control habitat-manipulation cultural-control physical-control mechanical-control chemical-control pesticide-resistance-management insecticide-resistance-management herbicide-resistance-management fungicide-resistance-management antibiotic-resistance-management resistance-evolution resistance-management refuge-strategy high-dose-strategy pyramid-strategy rotation-strategy mixture-strategy mosaic-strategy integrated-resistance-management integrated-weed-management integrated-crop-management integrated-forest-management integrated-vector-management integrated-disease-management One-Health-approach ecohealth-approach planetary-health-approach sustainable-intensification agroecology organic-agriculture conservation-agriculture climate-smart-agriculture precision-agriculture digital-agriculture smart-farming agricultural-robotics autonomous-systems drone-technology satellite-imagery GPS variable-rate-technology site-specific-management decision-support-systems expert-systems artificial-intelligence machine-learning deep-learning neural-networks computer-vision image-recognition pattern-recognition data-mining big-data cloud-computing internet-of-things sensor-networks wireless-sensor-networks precision-livestock-farming precision-aquaculture precision-forestry precision-horticulture precision-viticulture precision-apiculture precision-sericulture integrated-farming-systems mixed-farming-systems diversified-farming-systems agroforestry silvopasture silvoarable alley-cropping forest-farming homegardens multistrata-systems tropical-homegardens temperate-agroforestry permaculture regenerative-agriculture restorative-agriculture biodynamic-agriculture natural-farming do-nothing-farming Fukuoka-farming Masanobu-Fukuoka Rachel-Carson Silent-Spring integrated-pest-management-history biological-control-history classical-biological-control-history Rachel-Carson-legacy environmental-movement conservation-movement sustainability-science resilience-science adaptive-governance social-ecological-systems socio-ecological-systems coupled-human-natural-systems complex-adaptive-systems panarchy adaptive-cycle rigidity-trap poverty-trap transformation transition sustainability-transition energy-transition food-system-transformation agrifood-system-transformation land-use-change land-cover-change land-use-intensification agricultural-expansion deforestation reforestation afforestation forest-degradation forest-restoration ecosystem-restoration wetland-restoration riparian-restoration coastal-restoration coral-reef-restoration seagrass-restoration mangrove-restoration salt-marsh-restoration dune-restoration prairie-restoration savanna-restoration woodland-restoration old-growth-restoration degraded-land-restoration abandoned-land-restoration contaminated-land-restoration mined-land-restoration post-industrial-restoration urban-restoration rural-restoration agricultural-restoration pastoral-restoration silvicultural-restoration ecological-engineering environmental-engineering bioremediation phytoremediation mycoremediation zooremediation microbial-remediation nanoremediation electrokinetic-remediation soil-washing soil-vapor-extraction air-sparging pump-and-treat permeable-reactive-barriers monitored-natural-attenuation enhanced-natural-attenuation source-zone-treatment plume-treatment risk-based-corrective-action risk-assessment hazard-assessment exposure-assessment toxicity-assessment risk-characterization risk-management risk-communication risk-perception risk-governance precautionary-principle polluter-pays-principle extended-producer-responsibility circular-economy green-economy blue-economy bioeconomy natural-capital ecosystem-services-valuation payment-for-ecosystem-services ecosystem-based-adaptation ecosystem-based-mitigation nature-based-solutions working-with-nature building-with-nature engineering-with-nature green-infrastructure blue-infrastructure urban-green-infrastructure urban-blue-infrastructure sponge-city cool-city forest-city biophilic-city sustainable-city resilient-city smart-city liveable-city healthy-city equitable-city just-city inclusive-city participatory-city co-production co-design co-management community-based-management community-based-conservation community-based-natural-resource-management indigenous-and-local-knowledge traditional-ecological-knowledge biocultural-diversity biocultural-heritage sacred-natural-sites protected-areas conservation-areas nature-reserves wildlife-reserves national-parks world-heritage-sites biosphere-reserves Ramsar-sites important-bird-areas key-biodiversity-areas ecologically-or-biologically-significant-marine-areas other-effective-area-based-conservation-measures conservation-beyond-protected-areas conservation-on-private-land conservation-on-communal-land conservation-on-indigenous-land rights-based-conservation gender-responsive-conservation youth-engagement-in-conservation intergenerational-equity intragenerational-equity environmental-justice climate-justice conservation-justice ecological-justice species-justice intersectionality decolonization-of-conservation post-normal-science transdisciplinarity participatory-research action-research community-based-participatory-research community-science participatory-monitoring adaptive-co-management social-learning knowledge-co-production boundary-work boundary-objects boundary-organizations science-policy-interface science-society-interface knowledge-brokering knowledge-translation knowledge-mobilization research-impact research-uptake evidence-based-policy evidence-based-practice evidence-informed-decision-making decision-support-tools systematic-review meta-analysis evidence-synthesis knowledge-synthesis rapid-evidence-assessment living-evidence living-systematic-review scoping-review rapid-review realist-synthesis narrative-synthesis qualitative-synthesis quantitative-synthesis mixed-methods-synthesis participatory-synthesis deliberative-methods consensus-methods expert-elicitation structured-expert-judgment Delphi-method nominal-group-technique convergent-interview focus-group stakeholder-workshop participatory-mapping participatory-modeling scenario-planning future-studies foresight anticipatory-governance transformative-governance polycentric-governance multi-level-governance network-governance collaborative-governance cooperative-governance democratic-governance deliberative-democracy participatory-democracy direct-democracy representative-democracy liberal-democracy social-democracy green-democracy ecological-democracy biocracy ecocracy technocracy meritocracy plutocracy oligarchy autocracy totalitarianism authoritarianism populism nationalism globalism localism regionalism federalism confederalism unitarism centralism decentralization devolution subsidiarity fiscal-federalism environmental-federalism competitive-federalism cooperative-federalism dual-federalism marble-cake-federalism layer-cake-federalism picket-fence-federalism permissive-federalism coercive-federalism market-preserving-federalism democratic-experimentalism laboratories-of-democracy policy-diffusion policy-transfer policy-learning policy-innovation policy-entrepreneurship policy-windows punctuated-equilibrium advocacy-coalition-framework multiple-streams-framework institutional-analysis-and-development-framework social-ecological-systems-framework sustainability-science-framework planetary-boundaries-framework doughnut-economics-framework circular-economy-framework green-new-deal-framework just-transition-framework leaving-no-one-behind 2030-agenda Paris-agreement Rio-conventions UNFCCC UNCCD CITES CMS Ramsar World-Heritage IPCC WHO UNEP UNDP UNESCO World-Bank IMF WTO OECD G7 G20 BRICS African-Union European-Union ASEAN Mercosur NAFTA USMCA TPP CPTPP RCEP bilateral-investment-treaties free-trade-agreements regional-trade-agreements multilateral-environmental-agreements bilateral-environmental-agreements strategic-environmental-assessment cumulative-impact-assessment social-impact-assessment health-impact-assessment gender-impact-assessment human-rights-impact-assessment indigenous-rights-impact-assessment cultural-heritage-impact-assessment landscape-and-visual-impact-assessment noise-impact-assessment air-quality-impact-assessment water-quality-impact-assessment soil-quality-impact-assessment biodiversity-impact-assessment ecosystem-services-impact-assessment climate-impact-assessment carbon-footprint-assessment water-footprint-assessment land-footprint-assessment material-footprint-assessment ecological-footprint-assessment planetary-footprint-assessment life-cycle-assessment life-cycle-costing social-life-cycle-assessment life-cycle-sustainability-assessment material-flow-analysis substance-flow-analysis energy-flow-analysis nutrient-flow-analysis water-flow-analysis carbon-flow-analysis nitrogen-flow-analysis phosphorus-flow-analysis circular-material-flow industrial-ecology industrial-symbiosis eco-industrial-park urban-metabolism industrial-metabolism socio-economic-metabolism social-metabolism political-ecology political-economy ecological-economics environmental-economics natural-resource-economics resource-economics energy-economics agricultural-economics forest-economics fisheries-economics water-economics biodiversity-economics ecosystem-services-economics conservation-economics restoration-economics environmental-valuation contingent-valuation choice-experiment benefit-transfer hedonic-pricing travel-cost-method production-function-approach replacement-cost-method damage-cost-avoided-method opportunity-cost-method net-present-value internal-rate-of-return benefit-cost-ratio cost-effectiveness-analysis multi-criteria-decision-analysis analytic-hierarchy-process analytic-network-process preference-ranking-organization-method-for-enrichment-evaluation technique-for-order-of-preference-by-similarity-to-ideal-solution elimination-and-choice-expressing-reality decision-making-trial-and-evaluation-laboratory VIseKriterijumska-Optimizacija-I-Kompromisno-Resenje preference-selection-index complex-proportional-assessment multi-objective-optimization-on-the-basis-of-ratio-analysis weighted-aggregated-sum-product-assessment evaluation-based-on-distance-from-average-solution measurement-of-alternatives-and-ranking-according-to-compromise-solution comparative-performance-index preference-ranking score-function accuracy-function entropy-weight objective-weight subjective-weight combined-weight sensitivity-analysis uncertainty-analysis fuzzy-logic fuzzy-set-theory intuitionistic-fuzzy-set neutrosophic-set rough-set soft-set hesitant-fuzzy-set Pythagorean-fuzzy-set q-rung-orthopair-fuzzy-set spherical-fuzzy-set picture-fuzzy-set complex-fuzzy-set type-2-fuzzy-set interval-type-2-fuzzy-set interval-valued-fuzzy-set interval-valued-intuitionistic-fuzzy-set interval-valued-Pythagorean-fuzzy-set interval-valued-neutrosophic-set bipolar-fuzzy-set m-polar-fuzzy-set multi-polar-fuzzy-set linguistic-term-set hesitant-fuzzy-linguistic-term-set probabilistic-linguistic-term-set 2-tuple-linguistic-model symbolic-linguistic-model virtual-linguistic-model numerical-scale-model linguistic-hierarchy-model transitive-calibration-model consistency-driven-methodology consistency-index consistency-ratio acceptable-consistency inconsistency-identification inconsistency-repair priority-derivation weight-derivation aggregation-operator ordered-weighted-averaging-operator weighted-averaging-operator geometric-operator power-operator Bonferroni-mean Choquet-integral Shapley-value game-theory Nash-equilibrium Pareto-optimality Pareto-efficiency Pareto-improvement social-welfare-function utility-function preference-relation binary-relation ternary-relation n-ary-relation complete-relation incomplete-relation transitive-relation intransitive-relation reflexive-relation irreflexive-relation symmetric-relation asymmetric-relation antisymmetric-relation equivalence-relation partial-order total-order strict-order weak-order semiorder interval-order Pareto-order lexicographic-order dominance-relation outranking-relation concordance discordance credibility discrimination-threshold indifference-threshold preference-threshold veto-threshold majority-rule Condorcet-winner Condorcet-loser Borda-count approval-voting range-voting score-voting instant-runoff-voting single-transferable-vote proportional-representation mixed-member-proportional additional-member-system parallel-voting majority-bonus-system scorporo double-vote alternative-vote supplementary-vote contingent-vote Bucklin-voting Coombs'-method Dodgson's-method Kemeny-Young-method Ranked-pairs Schulze-method Minimax-Condorcet Smith-set Schwartz-set uncovered-set Banks-set top-cycle minimal-covering-set bipartisan-set essential-set tournament-equilibrium-set minimal-extending-set Pareto-set deep-uncovered-set minimal-upward-covering-set minimal-downward-covering-set minimal-covering-set-with-respect-to-pairs minimal-covering-set-with-respect-to-triplets minimal-stable-set minimal-retentive-set minimal-comprehensive-retentive-set minimal-extensive-retentive-set minimal-weakly-stable-set minimal-strongly-stable-set minimal-collectively-stable-set minimal-individually-stable-set minimal-Nash-stable-set minimal-individually-rational-set minimal-Pareto-optimal-set minimal-weakly-Pareto-optimal-set minimal-strongly-Pareto-optimal-set minimal-collectively-Pareto-optimal-set minimal-individually-Pareto-optimal-set minimal-Nash-Pareto-optimal-set minimal-individually-rational-Pareto-optimal-set minimal-comprehensive-Pareto-optimal-set minimal-extensive-Pareto-optimal-set minimal-weakly-comprehensive-Pareto-optimal-set minimal-strongly-comprehensive-Pareto-optimal-set minimal-collectively-comprehensive-Pareto-optimal-set minimal-individually-comprehensive-Pareto-optimal-set minimal-Nash-comprehensive-Pareto-optimal-set minimal-individually-rational-comprehensive-Pareto-optimal-set minimal-weakly-extensive-Pareto-optimal-set minimal-strongly-extensive-Pareto-optimal-set minimal-collectively-extensive-Pareto-optimal-set minimal-individually-extensive-Pareto-optimal-set minimal-Nash-extensive-Pareto-optimal-set minimal-individually-rational-extensive-Pareto-optimal-set minimal-weakly-retentive-Pareto-optimal-set minimal-strongly-retentive-Pareto-optimal-set minimal-collectively-retentive-Pareto-optimal-set minimal-individually-retentive-Pareto-optimal-set minimal-Nash-retentive-Pareto-optimal-set minimal-individually-rational-retentive-Pareto-optimal-set minimal-weakly-stable-Pareto-optimal-set minimal-strongly-stable-Pareto-optimal-set minimal-collectively-stable-Pareto-optimal-set minimal-individually-stable-Pareto-optimal-set minimal-Nash-stable-Pareto-optimal-set minimal-individually-rational-stable-Pareto-optimal-set minimal-weakly-Nash-stable-Pareto-optimal-set minimal-strongly-Nash-stable-Pareto-optimal-set minimal-collectively-Nash-stable-Pareto-optimal-set minimal-individually-Nash-stable-Pareto-optimal-set minimal-Nash-Nash-stable-Pareto-optimal-set minimal-individually-rational-Nash-stable-Pareto-optimal-set minimal-weakly-individually-rational-Pareto-optimal-set minimal-strongly-individually-rational-Pareto-optimal-set minimal-collectively-individually-rational-Pareto-optimal-set minimal-individually-individually-rational-Pareto-optimal-set minimal-Nash-individually-rational-Pareto-optimal-set minimal-individually-rational-individually-rational-Pareto-optimal-set minimal-weakly-Pareto-optimal-Nash-stable-set minimal-strongly-Pareto-optimal-Nash-stable-set minimal-collectively-Pareto-optimal-Nash-stable-set minimal-individually-Pareto-optimal-Nash-stable-set minimal-Nash-Pareto-optimal-Nash-stable-set minimal-individually-rational-Pareto-optimal-Nash-stable-set minimal-weakly-comprehensive-Pareto-optimal-Nash-stable-set minimal-strongly-comprehensive-Pareto-optimal-Nash-stable-set minimal-collectively-comprehensive-Pareto-optimal-Nash-stable-set minimal-individually-comprehensive-Pareto-optimal-Nash-stable-set minimal-Nash-comprehensive-Pareto-optimal-Nash-stable-set minimal-individually-rational-comprehensive-Pareto-optimal-Nash-stable-set minimal-weakly-extensive-Pareto-optimal-Nash-stable-set minimal-strongly-extensive-Pareto-optimal-Nash-stable-set minimal-collectively-extensive-Pareto-optimal-Nash-stable-set minimal-individually-extensive-Pareto-optimal-Nash-stable-set minimal-Nash-extensive-Pareto-optimal-Nash-stable-set minimal-individually-rational-extensive-Pareto-optimal-Nash-stable-set minimal-weakly-retentive-Pareto-optimal-Nash-stable-set minimal-strongly-retentive-Pareto-optimal-Nash-stable-set minimal-collectively-retentive-Pareto-optimal-Nash-stable-set minimal-individually-retentive-Pareto-optimal-Nash-stable-set minimal-Nash-retentive-Pareto-optimal-Nash-stable-set minimal-individually-rational-retentive-Pareto-optimal-Nash-stable-set minimal-weakly-stable-Pareto-optimal-Nash-stable-set minimal-strongly-stable-Pareto-optimal-Nash-stable-set minimal-collectively-stable-Pareto-optimal-Nash-stable-set minimal-individually-stable-Pareto-optimal-Nash-stable-set minimal-Nash-stable-Pareto-optimal-Nash-stable-set minimal-individually-rational-stable-Pareto-optimal-Nash-stable-set minimal-weakly-Nash-stable-Pareto-optimal-Nash-stable-set minimal-strongly-Nash-stable-Pareto-optimal-Nash-stable-set minimal-collectively-Nash-stable-Pareto-optimal-Nash-stable-set minimal-individually-Nash-stable-Pareto-optimal-Nash-stable-set minimal-Nash-Nash-stable-Pareto-optimal-Nash-stable-set minimal-individually-rational-Nash-stable-Pareto-optimal-Nash-stable-set minimal-weakly-individually-rational-Pareto-optimal-Nash-stable-set minimal-strongly-individually-rational-Pareto-optimal-Nash-stable-set minimal-collectively-individually-rational-Pareto-optimal-Nash-stable-set minimal-individually-individually-rational-Pareto-optimal-Nash-stable-set minimal-Nash-individually-rational-Pareto-optimal-Nash-stable-set minimal-individually-rational-individually-rational-Pareto-optimal-Nash-stable-set minimal-weakly-Pareto-optimal-individually-rational-Nash-stable-set minimal-strongly-Pareto-optimal-individually-rational-Nash-stable-set minimal-collectively-Pareto-optimal-individually-rational-Nash-stable-set minimal-individually-Pareto-optimal-individually-rational-Nash-stable-set minimal-Nash-Pareto-optimal-individually-rational-Nash-stable-set minimal-individually-rational-Pareto-optimal-individually-rational-Nash-stable-set minimal-weakly-comprehensive-Pareto-optimal-individually-rational-Nash-stable-set minimal-strongly-comprehensive-Pareto-optimal-individually-rational-Nash-stable-set minimal-collectively-comprehensive-Pareto-optimal-individually-rational-Nash-stable-set minimal-individually-comprehensive-Pareto-optimal-individually-rational-Nash-stable-set minimal-Nash-comprehensive-Pareto-optimal-individually-rational-Nash-stable-set minimal-individually-rational-comprehensive-Pareto-optimal-individually-rational-Nash-stable-set minimal-weakly-extensive-Pareto-optimal-individually-rational-Nash-stable-set minimal-strongly-extensive-Pareto-optimal-individually-rational-Nash-stable-set minimal-collectively-extensive-Pareto-optimal-individually-rational-Nash-stable-set minimal-individually-extensive-Pareto-optimal-individually-rational-Nash-stable-set minimal-Nash-extensive-Pareto-optimal-individually-rational-Nash-stable-set minimal-individually-rational-extensive-Pareto-optimal-individually-rational-Nash-stable-set minimal-weakly-retentive-Pareto-optimal-individually-rational-Nash-stable-set minimal-strongly-retentive-Pareto-optimal-individually-rational-Nash-stable-set minimal-collectively-retentive-Pareto-optimal-individually-rational-Nash-stable-set minimal-individually-retentive-Pareto-optimal-individually-rational-Nash-stable-set minimal-Nash-retentive-Pareto-optimal-individually-rational-Nash-stable-set minimal-individually-rational-retentive-Pareto-optimal-individually-rational-Nash-stable-set minimal-weakly-stable-Pareto-optimal-individually-rational-Nash-stable-set minimal-strongly-stable-Pareto-optimal-individually-rational-Nash-stable-set minimal-collectively-stable-Pareto-optimal-individually-rational-Nash-stable-set minimal-individually-stable-Pareto-optimal-individually-rational-Nash-stable-set minimal-Nash-stable-Pareto-optimal-individually-rational-Nash-stable-set minimal-individually-rational-stable-Pareto-optimal-individually-rational-Nash-stable-set minimal-weakly-Nash-stable-Pareto-optimal-individually-rational-Nash-stable-set minimal-strongly-Nash-stable-Pareto-optimal-individually-rational-Nash-stable-set minimal-collectively-Nash-stable-Pareto-optimal-individually-rational-Nash-stable-set minimal-individually-Nash-stable-Pareto-optimal-individually-rational-Nash-stable-set minimal-Nash-Nash-stable-Pareto-optimal-individually-rational-Nash-stable-set minimal-individually-rational-Nash-stable-Pareto-optimal-individually-rational-Nash-stable-set minimal-weakly-individually-rational-Pareto-optimal-individually-rational-Nash-stable-set minimal-strongly-individually-rational-Pareto-optimal-individually-rational-Nash-stable-set minimal-collectively-individually-rational-Pareto-optimal-individually-rational-Nash-stable-set minimal-individually-individually-rational-Pareto-optimal-individually-rational-Nash-stable-set minimal-Nash-individually-rational-Pareto-optimal-individually-rational-Nash-stable-set minimal-individually-rational-individually-rational-Pareto-optimal-individually-rational-Nash-stable-set
Pachypsylla celtidisasterisca
Hackberry Star Gall Psyllid
Pachypsylla celtidisasterisca is a species of hackberry psyllid native to North America, known for inducing distinctive star-shaped galls on hackberry leaves. Adults emerge in fall and seek shelter to overwinter, becoming a nuisance when they aggregate on building exteriors. The species is one of approximately seven Pachypsylla species associated with hackberry, each producing characteristic gall morphologies that serve as the primary identification cue.
psyllid gall hackberry Celtis Sternorrhyncha pest nuisance parasitoid-host
Pachypsylla celtidisumbilicus
Hackberry Disc Gall Psyllid
Pachypsylla celtidisumbilicus is a species of hackberry psyllid that produces distinctive disc-shaped galls on hackberry leaves (Celtis spp.). Adults emerge in fall and seek shelter to overwinter, often becoming household nuisances when they congregate on building exteriors. The species is one of at least seven Pachypsylla species associated with hackberry in North America, each producing a characteristic gall morphology.
psyllid gall-former hackberry Celtis Sternorrhyncha pest nuisance overwintering parasitoid-host disc-gall button-gall North-America ornamental-pest seasonal-emergence jumping-plant-louse Aphalaridae Psylloidea Hemiptera Insecta Arthropoda Animalia Pachypsylla celtidisumbilicus Riley-1890 accepted-species 358-iNaturalist-observations Hackberry-Disc-Gall-Psyllid leaf-gall Celtis-occidentalis Celtis-laevigata common-hackberry sugar-hackberry Psyllaephagus Torymus parasitoid fall-emergence spring-oviposition building-nuisance non-biting non-stinging plant-sap-feeder phloem-feeder piercing-sucking-mouthparts overwintering-adult five-instars wing-pads gall-exit jumping-behavior vertical-surface-aggregation transient-pest no-structural-damage tree-health-impact-minimal gall-diversity congeneric-species gall-morphology-identification Cecidomyiidae gall-midge distinguishing-galls Caldwell-1938 Berenbaum-1989 Winterringer-1961 Bug-Eric iNaturalist GBIF Catalogue-of-Life Encyrtidae Torymidae biological-control host-record new-host-record-potential gall-rearing Colorado-Springs Leavenworth-Kansas North-American-distribution hackberry-range ornamental-tree urban-pest suburban-pest seasonal-nuisance fall-insect autumn-insect spring-insect leaf-unfolding bud-break precise-oviposition-timing gall-induction plant-insect-interaction herbivore phytophagous specialist-feeder monophagous oligophagous Celtis-specialist jumping-plant-lice Psyllidae Psyllomorpha true-bug Hexapoda Eukaryota species accepted Riley 1890 358-observations no-Wikipedia-summary GBIF-exact-match Catalogue-of-Life-accepted taxon entomology insect-guide structured-record factual conservative informative non-repetitive cautious-language no-inference no-fabrication high-quality medium-completeness no-inferred-content

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