T = 0 (non-toxic; no clinical toxicity documented) No human toxicity documented for B. pubescens. Bark, leaves, sap documented in traditional food/medicinal use across northern Europe (birch sap, herbal infusions). No poison centre records of symptomatic toxic exposures. T=0 fully consistent with absence of any toxicological concern. Sources: Frohne & Pfänder (2005); CAPB plant database (no entries for Betula toxicity).
A = 0 (fully safe; no veterinary toxicity) No adverse effects documented in livestock or companion animals. Leaves and bark browsed without harm. Not listed by ASPCA as toxic. Sources: ASPCA APCC; Cooper & Johnson (1998).
I = 0 (native; no invasive impact) Native throughout Luxembourg and continental Europe; characteristic of acidic wetlands, riparian zones, and montane forests. No competitive displacement documented. Not listed under EU Regulation 1143/2014. Declining species (VU status).
Core Indices:
ALL ✓ — Betula pubescens produces highly allergenic pollen (primary allergen Bet v 1, PR-10 protein family). Birch pollen is the dominant spring aeroallergen in northern and central Europe. Epidemiological burden: ~100M sensitised individuals in Europe documented across multiple large-scale studies (EAACIsupported data; Heinzerling et al. 2009 Allergy). Cross-reactivity with food allergens (apple, hazelnut, celery — oral allergy syndrome) substantially increases clinical burden. Population alert level: Very High (>50M). Note: ALL assigned collectively to Betula genus pollen pool; B. pubescens co-produces Bet v 1 alongside B. pendula and contributes to total regional pollen load. Epidemiological data not disaggregated by species; attribution reflects genus-level burden as per methodology.
THR ✓ — VU, Ferrantia 93 (2025), criteria B2ab(i,iv), habitat FOR. Area of occupancy restricted in Luxembourg; continuing decline in extent of occurrence and habitat quality documented. Restricted to acidic wetland and riparian forest habitats under pressure from drainage and land-use change.