One in Four Dutch Honeybee Colonies Died Last Winter
Wageningen, Thursday, 30 July 2026.
A devastating 24% of Dutch honeybee colonies died last winter, marking the fourth consecutive year of critical losses, with some regions losing over 40% of their bees.
Agritech and Ecological Monitoring: Diagnosing the Colony Crisis
The critical situation facing Dutch honeybee colonies falls squarely within the domains of agritech, ecological management, and food security [1][3]. Because honeybees are vital pollinators for both wild biodiversity and commercial crops, tracking their health is an essential component of modern agricultural technology [GPT]. The primary innovation addressing this crisis is the annual COLOSS survey, a highly structured, data-driven monitoring framework designed to diagnose colony health and identify environmental pressures [1][3]. This systematic monitoring works by collecting standardized winter survival and management data from local beekeepers, allowing researchers to map regional mortality trends and evaluate the efficacy of pest control methods [1][3].
Key Actors and the Benefits of Standardized Data
This research initiative is led by Wageningen University & Research (WUR), an institution based in Wageningen, Netherlands [1][3]. To execute this comprehensive study, WUR collaborates closely with the Dutch Beekeepers Association (NBV), Imkers Nederland, biodynamic beekeepers (BD-imkers), and professional beekeepers (BVNI) [1][3]. The entire monitoring framework is commissioned by the Dutch Ministry of Agriculture, Fisheries, Food Security and Nature (LVVN) [1][3]. By providing clear, empirical insights into why colonies are failing, this agritech innovation allows policymakers and agriculturalists to design targeted interventions, optimize ecological management, and deploy precise parasite control measures rather than relying on guesswork [1][3].
Regional Disparities and Economic Realities
The data from the 2025-2026 winter season reveals a stark reality: 24% of Dutch honeybee colonies did not survive, marking the fourth consecutive year where winter mortality exceeded the 20% threshold [1][3]. However, the national average masks severe regional disparities [1][3]. Beekeepers in the province of Groningen faced the highest mortality rate at 41.5%, while those in Overijssel recorded the lowest at 16.9% [1][3]. Other provinces, including Zeeland, Utrecht, and Noord-Holland, also registered loss rates that exceeded the national average [1][3]. These losses pose a significant threat to agricultural pollination, even though only 2.5% of the estimated 11,000 active beekeepers in the Netherlands—equal to 275 individuals—derive full or partial income from the practice [1][3].
The Threat of Varroa Mites and the Asian Hornet
The WUR study identifies several key drivers of winter mortality, including queen loss, food shortages, disease, weakened pre-winter conditions, and the parasitic mite Varroa destructor [1][3]. To combat the mite, 86.9% of Dutch beekeepers implemented control measures during the 2025-2026 winter [1][3]. This remains consistent with historical intervention rates of 84.6% in 2025 and 86.8% in 2024 [1][3]. Meanwhile, the rapid spread of the invasive Asian hornet (Vespa velutina) presents an escalating threat [1][3]. Reported sightings of the predator by Dutch beekeepers surged from 24.7% in 2024 to 56.4% in 2025, representing an absolute increase of 31.7 percentage points [1][3]. While the hornet’s exact impact on the 2025-2026 winter mortality rate remains uncertain [alert! ‘impact of invasive species on winter mortality remains unclear’], researchers expect its negative pressure on honeybee colonies to intensify in the coming years [3].